Updated on 2022/11/07

写真a

 
TANIYAMA Tomoyasu
 
Organization
Graduate School of Science Professor
Graduate School
Graduate School of Science
Undergraduate School
School of Science Department of Physics
Title
Professor
Contact information
メールアドレス

Degree 1

  1. Doctor (Engineering) ( 1997.2   Keio University ) 

Research Interests 3

  1. Nanomagnetism

  2. Spintronics

  3. マルチフェロイクス

Research Areas 4

  1. Natural Science / Magnetism, superconductivity and strongly correlated systems

  2. Nanotechnology/Materials / Metallic material properties

  3. Nanotechnology/Materials / Applied physical properties

  4. Nanotechnology/Materials / Inorganic materials and properties

Research History 7

  1. Nagoya University   Divison of Material Science (Physics), Graduate School of Science   Professor

    2018.4

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    Country:Japan

  2. Tokyo Institute of Technology   Laboratory for Materials and Structures, Institute of Innovative Research   Associate professor

    2016.4 - 2018.3

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    Country:Japan

  3. Tokyo Institute of Technology   Materials and Structures Laboratory   Associate professor

    2006.11 - 2016.3

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    Country:Japan

  4. Tokyo Institute of Technology   Materials and Structures Laboratory   Lecturer

    2004.8 - 2006.10

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    Country:Japan

  5. University of Cambridge   Cavendish Laboratory   Visiting Researcher

    2001.6 - 2003.6

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    Country:United Kingdom

  6. Tokyo Institute of Technology   Interdisciplinary Graduate School of Science and Engineering   Assistant

    1998.8 - 2004.7

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    Country:Japan

  7. National Research Institute for Metals   Postdoctoral Research Fellow

    1996.10 - 1998.7

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    Country:Japan

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Education 3

  1. Keio University   Graduate School, Division of Science and Engineering   Department of Materials Science

    1993.4 - 1996.9

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    Country: Japan

  2. Keio University   Graduate School, Division of Science and Engineering   Department of Materials Science

    1991.4 - 1993.3

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    Country: Japan

  3. Keio University   Faculty of Science and Engineering

    1987.4 - 1991.3

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    Country: Japan

Professional Memberships 3

  1. 日本磁気学会

  2. 応用物理学会

  3. 日本物理学会

Committee Memberships 4

  1. 応用物理学会スピントロニクス研究会   幹事  

    2019.1 - 2021.12   

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    Committee type:Academic society

  2. 応用物理学会スピントロニクス研究会   庶務幹事  

    2017.1 - 2018.12   

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    Committee type:Academic society

  3. 日本磁気学会編集・論文委員会   幹事・分野主査  

    2013.6 - 2021.5   

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    Committee type:Academic society

  4. 日本物理学会   領域3(磁性)世話人  

    2005.11 - 2006.10   

Awards 11

  1. 日本磁気学会令和元年度優秀研究賞

    2019.9   日本磁気学会   界面マルチフェロイクスにおける磁性制御に関する研究

    谷山智康

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. 粉体粉末冶金協会平成30年度論文賞

    2019.6   粉体粉末冶金協会   Effect of strain on magnetic properties of Nd-Fe-B thin film magnets on BaTiO3

    橋下龍司, 佐藤拓也, 梅田裕二, 田中美知, 鈴木健一, 榎戸靖, 谷山智康

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  3. 13th Joint MMM-Intermag Best Poster Award

    2016.1   American Institute of Physics   Electric-field-induced strain transfer effect on magnetic phase in FeRh/BaTiO3

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    Award type:Award from international society, conference, symposium, etc.  Country:United States

  4. ICF 11 New Product & Novel Technology Award

    2013.4   11th International Conference on Ferrites   Electron spin transmission due to spin-filtering effect in Fe3O4-based spin-LED structure

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    Award type:Award from international society, conference, symposium, etc.  Country:Japan

  5. 文部科学大臣表彰若手科学者賞

    2005.4   文部科学省   ナノ磁性分野におけるスピンエレクトロニクスの研究

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    Country:Japan

  6. MSJ Research Excellence Award 2019

    2019.9   The Magnetics Society of Japan  

    Tomoyasu Taniyama

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    Country:Japan

  7. 応用セラミックス研究所所長賞(研究業績部門)

    2011.6   東京工業大学   磁性ヘテロ量子構造におけるスピン伝導とスピン注入源の開発

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    Country:Japan

  8. 東工大挑戦的研究賞

    2007.10   東京工業大学   半導体へテロ界面におけるスピン蓄積現象とスピン機能デバイスへの展開

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    Country:Japan

  9. 手島工業教育資金団 中村研究賞

    2004.3   手島工業教育資金団   スピンエレクトロニクスデバイスの実現に向けたスピン注入・検出の研究

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  10. 第3回船井情報科学奨励賞

    2004.3   船井情報科学振興財団   人工ナノ磁性体を利用したスピンエレクトロニクスに関する研究

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  11. 第13回安藤博記念学術奨励賞

    2000.7   安藤研究所   強磁性体/常磁性体接合細線を用いたスピン注入とその応用に関する研究

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

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Papers 215

  1. Zero-field routing of spin waves in a multiferroic heterostructure Reviewed International journal

    Weijia Zhu, Huajun Qin, Lukáš Flajšman, Tomoyasu Taniyama, Sebastiaan van Dijken

    App. Phys. Lett.   Vol. 120 ( 11 ) page: 112407 - 112407   2022.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    We report zero-field routing of spin waves in a multiferroic heterostructure comprising a ferromagnetic Fe film and a ferroelectric BaTiO<sub>3</sub> substrate with fully correlated strain-coupled domains. In the Fe film, a regular alternation of magnetic anisotropy produces a back-and-forth rotation of uniform magnetization in zero magnetic field. Spin waves propagating across this domain structure are refracted at the magnetic domain walls because of abrupt changes in the dispersion relation and phase velocity. Using super-Nyquist sampling magneto-optical Kerr effect microscopy, we image the routing of spin waves and analyze the dependence of the effect on frequency and the propagation direction. We find that spin waves are routed efficiently by angles up to 60° without measurable loss in amplitude. The experimental results are reproduced by micromagnetic simulations and calculations based on the modified Snell's law for magnonics.

    DOI: 10.1063/5.0086430

  2. Optical selection rules of the magnetic excitation in the S=12 one-dimensional Ising-like antiferromagnet BaCo2V2O8 Reviewed International journal

    Shojiro Kimura, Hiroaki Onishi, Akira Okutani, Mitsuru Akaki, Yasuo Narumi, Masayuki Hagiwara, Kouichi Okunishi, Koichi Kindo, Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh

    Phys. Rev. B   Vol. 105 ( 1 ) page: 014417   2022.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevb.105.014417

    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.105.014417/fulltext

  3. Electric‐Field Control of Propagating Spin Waves by Ferroelectric Domain‐Wall Motion in a Multiferroic Heterostructure Reviewed International journal

    Huajun Qin, Rouven Dreyer, Georg Woltersdorf, Tomoyasu Taniyama, Sebastiaan van Dijken

    Adv. Mater.   Vol. 33 ( 27 ) page: 2100646 - 2100646   2021.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/adma.202100646

    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/adma.202100646

  4. Manipulation of Perpendicular Magnetic Anisotropy by Interfacial Strain: Development of Orbital Elastic Effect by Electric-Field Induced XMCD Reviewed International journal

    Jun OKABAYASHI, Yoshio MIURA, Tomoyasu TANIYAMA

    Vacuum and Surface Science   Vol. 64 ( 5 ) page: 230 - 235   2021.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Surface Science Society Japan  

    DOI: 10.1380/vss.64.230

  5. Ferromagnetic phase nucleation and its growth evolution in FeRh thin films Reviewed International journal

    A. S. Komlev, D. Y. Karpenkov, D. A. Kiselev, T. S. Ilina, A. Chirkova, R. R. Gimaev, T. Usami, T. Taniyama, V. I. Zverev, N. S. Perov

    J. Alloys and Comp.   Vol. 874   page: 159924   2021.4

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  6. Temperature dependence of the effective Gilbert damping constant of FeRh thin films Reviewed International journal

    T. Usami, M. Itoh, T. Taniyama

    AIP Advances   Vol. 11 ( 4 ) page: 045302 - 045302   2021.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    DOI: 10.1063/5.0039577

  7. Shear-strain-mediated large nonvolatile tuning of ferromagnetic resonance by electric field in multiferroic heterostructures Reviewed

    M. Zheng, T. Usami, T. Taniyama

    NPG Asia Mater.   Vol. 13   page: 7   2021.1

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  8. Electric-field tunable anisotropic magnetoresistance effect in an epitaxial Co2FeSi/BaTiO3 interfacial multiferroic system Reviewed

    S. Yamada, Y. Teramoto, D. Matsumi, D. Kepaptsoglou, I. Azaceta, T. Murata, K. Kudo, V. K. Lazarov, T. Taniyama, K. Hamaya

    Phys. Rev. Mater.   Vol. 5 ( 1 ) page: 014412   2021.1

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  9. In-plane ferroelectricity and enhanced Curie temperature in perovskite BaTiO3 epitaxial thin films Reviewed

    K. Komatsu, I. Suzuki, T. Aoki, Y. Hamasaki, S. Yasui, M. Itoh, T. Taniyama

    Appl. Phys. Lett.   Vol. 117 ( 7 ) page: 072902   2020.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

  10. Epitaxial strain engineering of luminescent properties in ZnGa2O4:Mn thin films Reviewed

    T. Dazai, S. Yasui, T. Taniyama, M. Itoh

    Appl. Phys. Express   Vol. 13 ( 8 ) page: 082004   2020.7

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  11. Bandgap tuning and optimization of green-emitting Zn2SnO4-Mg2SnO4:Mn2+ using combinatorial pulsed laser deposition Reviewed

    T. Dazai, S. Yasui, T. Taniyama, M. Itoh

    Ceram. Int.   Vol. 46 ( 13 ) page: 21771 - 21774   2020.5

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  12. Switchable third ScFeO3 polar ferromagnet with YMnO3-type structure Reviewed

    Y. Hamasaki, T. Katayama, S. Yasui, T. Shiraishi, A. Akama, T. Kiguchi, T. Taniyama, and M. Itoh

    J. Mater. Chem. C   Vol. 8   page: 4447 - 4452   2020.4

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  13. The effects of BaTiO<inf>3</inf> nanodots density support on epitaxial LiCoO<inf>2</inf> thin-film for high-speed rechargeability Reviewed International journal

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Yumi Yoshikawa, Tomoyasu Taniyama, Mitsuru Itoh

    Electrochem. Commun.   Vol. 109   page: 106604   2019.12

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    © 2019 The Authors LiCoO2 (LCO) is one of the most promising cathode materials for Li ion batteries (LIBs). However, LCO shows a rate-limiting step of Li+ migration between electrode and electrolyte interfaces, requiring LIBs to be charged under low-current conditions. For next generation batteries, it will be necessary to meet the demand for a shorter charging-time. We investigated a support method for the LCO surface to improve high C-rate performance, and revealed that the Li+ intercalation/de-intercalation reaction into/from LCO was accelerated by the introduction of a BaTiO3-LCO-electrolyte interface (triple-phase interface; TPI), due to the electric field concentration near the TPI. In this report, we investigate the dependence of high C-rate performance on the density of surface BaTiO3 nanodots using epitaxial LiCoO2 thin films created via pulsed laser deposition (PLD). As the number of nanodots increased, so did discharge capacity at 50C, becoming saturated at surface coverage over 22%. However, at 100C, the discharge capacity decreased at surface coverage over 40%. These results indicate that coalescence of nanodots reduces not only the TPI length but also the electrochemically active range at quite high C-rate. Therefore, we infer that optimal surface coverage should be varied depending on the C-rate.

    DOI: 10.1016/j.elecom.2019.106604

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  14. The effect of relative permittivity of surface supporting materials for high-speed rechargeable LiCoO<inf>2</inf> cathode film Reviewed International journal

    Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Yumi Yoshikawa, Tomoyasu Taniyama, Mitsuru Itoh

    J. Power Sources   Vol. 441   page: 227194   2019.11

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    © 2019 Elsevier B.V. We previously reported that the BaTiO3(BTO)-LiCoO2(LCO)-electrolyte triple-phase interface (TPI) could play an important role in C-rate enhancement, however, why this supporting material is effective for high performance remains unknown. We focus on the relative permittivity of supporting materials using finite element method calculations and experiments. Calculations revealed that the electric field near the TPI was reinforced as the relative permittivity of supporting materials increased. Experimentally, we prepared nanodots and micropads deposited on LCO thin film using BTO and CeO2 as supporting materials to evaluate electrochemical properties and SEI formation mechanisms, respectively. High C-rate performance was improved by the introduction of CeO2 and BTO nanodots; however, only the BTO nanodots deposited on LCO could work at 100C. In addition, SEI around the TPI was quite thin around CeO2 and BTO pads, although 10 and 300 nm SEI were observed at the non-pad area of CeO2 and BTO, respectively. This indicated that the Li+ motion between electrolyte and electrode could be accelerated depending on the relative permittivity of supporting materials. The low SEI around the TPI of both the CeO2 and BTO pads suggested that the main reactions of Li+ insertion/de-insertion into/from LCO might be dominant around the TPI area.

    DOI: 10.1016/j.jpowsour.2019.227194

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  15. Voltage-driven strain-induced coexistence of both volatile and non-volatile interfacial magnetoelectric behaviors in LSMO/PMN-PT (001) Invited Reviewed

    S. P. Pati, T. Taniyama

    J. Phys. D: Appl. Phys.   Vol. 53 ( 5 ) page: 054003   2019.11

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  16. Compositional dependence of Gilbert damping constant of epitaxial Fe100-xRhx thin films Reviewed

    T. Usami, M. Itoh, T. Taniyama

    Appl. Phys. Lett.   Vol. 115 ( 14 ) page: 142403   2019.10

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  17. Strain-induced reversible manipulation of orbital magnetic moments in Ni/Cu multilayers on ferroelectric BaTiO3 Reviewed International journal

    Okabayashi, Jun, Miura, Yoshio, Taniyama, Tomoyasu

    NPJ Quantum Mater.   Vol. 4 ( 1 ) page: 21   2019.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATURE PUBLISHING GROUP  

    Controlling magnetic anisotropy by orbital magnetic moments related to interfacial strains has considerable potential for the development of future devices using spins and orbitals. For the fundamental physics, the relationship between strain and orbital magnetic moment is still unknown, because there are few tools to probe changes of orbital magnetic moment. In this study, we developed an electric field (E)-induced X-ray magnetic circular dichroism (EXMCD) technique to apply E to a ferroelectric BaTiO3 substrate. We reversibly tuned the interfacial lattice constants of Ni/Cu multilayers on BaTiO3 using this technique. As the domain structures in BaTiO3 are modulated by E, EXMCD measurements reveal that the changes in the magnetic anisotropy of Ni/Cu films are induced through the modulation of orbital magnetic moments in Ni with magneto-elastic contributions. The strained Ni layer that induces the perpendicular magnetic anisotropy without E is released at E = 8 kV/cm, and in-plane magnetization also occurs. We observed that EXMCD measurements clarified the origin of the reversible changes in perpendicular magnetic anisotropy and established the relationship between macroscopic inverse magnetostriction effects and microscopic orbital moment anisotropy.

    DOI: 10.1038/s41535-019-0159-y

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    Other Link: http://orcid.org/0000-0003-3683-5416

  18. Enhancement of Ultrahigh Rate Chargeability by Interfacial Nanodot BaTiO<sub>3</sub> Treatment on LiCoO<sub>2</sub> Cathode Thin Film Batteries.

    Yasuhara S, Yasui S, Teranishi T, Chajima K, Yoshikawa Y, Majima Y, Taniyama T, Itoh M

    Nano letters     2019.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/acs.nanolett.8b04690

    PubMed

  19. Growth of CuSbS2 single crystal as an environmentally friendly thermoelectric material Reviewed

    A. Nagaoka, M. Takeuchi, K Yoshino, S Ikeda, S. Yasui, T. Taniyama, K. Nishioka

    Phys. Status Solidi (a)   Vol. 216   page: 1800861   2019.2

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  20. Ferroelectric and ferrimagnetic properties of ε-RhxFe21xO3 thin films International journal

    S. Yasui, T. Katayama, T. Osakabe, Y. Hamasaki, T. Taniyama, M. Itoh

    J. Ceram. Soc. Jpn.   Vol. 127 ( 7 ) page: 474 - 477   2019.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2109/jcersj2.19048

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  21. Magnetic properties of single crystal GaFeO3 Reviewed

    K. Tachiyama, S. Yasui, B. N. A. Rao, T. Dazai, T. Usami, T. Taniyama, T. Katayama, Y. Hamasaki, J. Yu, H. He, H. Wang, M. Itoh

    MRS Advances   Vol. 4 ( 1 ) page: 61 - 66   2019

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    Other Link: http://orcid.org/0000-0003-3683-5416

  22. Effects of chalcogen composition on the thermoelectric properties in Cu2ZnSn(S1-xSex)(4) single crystals

    Nagaoka Akira, Masuda Taizo, Yasui Shintaro, Taniyama Tomoyasu, Nose Yoshitaro

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 10 )   2018.10

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    DOI: 10.7567/JJAP.57.101201

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  23. The single-crystal multinary compound Cu2ZnSnS4 as an environmentally friendly high-performance thermoelectric material Reviewed International journal

    Akira Nagaoka, Taizo Masuda, Shintaro Yasui, Tomoyasu Taniyama, Yoshitaro Nose

    Appl. Phys. Express   Vol. 11 ( 5 )   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Applied Physics  

    We investigated the thermoelectric properties of high-quality p-type Cu2ZnSnS4 single crystals. This material showed two advantages: low thermal conductivity because of lattice scattering caused by the easily formed Cu/Zn disordered structure, and high conductivity because of high doping from changes to the composition. All samples showed a thermal conductivity of 3.0 W m%1 K%1 at 300 K, and the Cu-poor sample showed a conductivity of 7.5 S/cm at 300 K because of the high density of shallow-acceptor Cu vacancies. The figure of merit of the Cu-poor Cu2ZnSnS4 reached 0.2 at 400 K, which is 1.4–45 times higher than those of related compounds.

    DOI: 10.7567/APEX.11.051203

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    Other Link: http://orcid.org/0000-0003-3683-5416

  24. Strain-mediated magnetic response in La0.67Sr0.33MnO3/SrTiO3/La0.67Sr0.33MnO3/BaTiO3 structure Reviewed

    Swain Anupama, Komatsu Katsuyoshi, Itoh Mitsuru, Taniyama Tomoyasu, Gorige Venkataiah

    AIP ADVANCES   Vol. 8 ( 5 )   2018.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5006597

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  25. Change in magnetization of ferromagnetic Pd(001) ultrathin films induced by the strain effect of BaTiO3 Reviewed

    Ban Yusuke, Komatsu Katsuyoshi, Sakuragi Shunsuke, Taniyama Tomoyasu, Kageshima Hiroyuki, Sato Tetsuya

    APPLIED PHYSICS LETTERS   Vol. 112 ( 14 )   2018.4

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    DOI: 10.1063/1.5020956

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  26. Strain Mediated in-Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO3 Single-Crystal Substrates Reviewed

    Shinji Isogami, Tomoyasu Taniyama

    Physica Status Solidi (A) Applications and Materials Science   Vol. 215 ( 6 ) page: 1700762   2018.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley-VCH Verlag  

    The uniaxial in-plane magnetic anisotropy constants (K1) of amorphous Co10Fe74B16 (CoFeB) films deposited on BaTiO3 (BTO) single-crystal substrates are characterized using a vibrating sample magnetometer. As a result, a significant increase in K1 with temperature is observed by a factor of 26, from 0.267 × 105 erg cm−3 at 300 K to 6.88 × 105 erg cm−3 at 230 K, and the thermal/K1 cycling was reproduced. Estimation of the magnetoelastic effect at the CoFeB/BTO interface demonstrated that the external stress resulting from the structural phase transition from tetragonal to orthorhombic structure in the (001) plane of BTO substrate is the primary cause of the instant magnetic anisotropy in amorphous systems with isotropic magnetostriction such as CoFeB.

    DOI: 10.1002/pssa.201700762

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    Other Link: http://orcid.org/0000-0003-3683-5416

  27. Spin torque in FeRh alloy measured by spin-torque ferromagnetic resonance Reviewed

    Tanaka Kensho, Moriyama Takahiro, Usami Takamasa, Taniyama Tomoyasu, Ono Teruo

    APPLIED PHYSICS EXPRESS   Vol. 11 ( 1 )   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.7567/APEX.11.013008

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  28. Potential of multinary compound Cu2ZnSnS4 single crystals for high-performance environmentally thermoelectric material Reviewed

    A. Nagaoka, T. Masuda, S. Yasui, T. Taniyama, Y. Nose

    Appl. Phys. Express   Vol. 11 ( 5 ) page: 051203   2018

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  29. High-Rate Performance of LiCoO2 Epitaxial Thin Films with Various Surface Conditions Reviewed

    Sou Yasuhara, Shintaro Yasui, Tomoyasu Taniyama, Mitsuru Itoh

    MRS Advances   Vol. 3 ( 22 ) page: 1243 - 1247   2018

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    © Materials Research Society 2018. Lithium ion batteries with high-rate performance have been demanded since electric and hybrid vehicles are released. It is known that high interfacial resistance between electrode and electrolyte prevents intercalation of lithium ions. We investigated high-rate capability of typical LiCoO2 cathode with various surface morphologies using epitaxial thin films prepared by pulsed laser deposition. As a result, high-rate performance in (104)LiCoO2 thin films was enhanced by an increase of (110)LiCoO2 facet density because diffusion coefficient of (110)LiCoO2 was larger than that of (104)LiCoO2. Therefore, a control of crystal plane at the surface is a key point for high-rate performance.

    DOI: 10.1557/adv.2018.253

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    Other Link: http://orcid.org/0000-0003-3683-5416

  30. Thermally driven magnetization switching of perpendicularly magnetized multilayers Reviewed

    Tomoyasu Taniyama, Yasuhiro Shirahata, Ryota Shiina, Eiji Wada, Mitsuru Itoh

    2017 IEEE 17th International Conference on Nanotechnology, NANO 2017     page: 1023 - 1026   2017.11

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Institute of Electrical and Electronics Engineers Inc.  

    Thermally driven magnetization switching of perpendicularly magnetized [Cu/Ni] multilayer/BaTiO3(100) heterostructures is demonstrated. While the magnetization of the multilayer shows the out-of-plane magnetic anisotropy in the tetragonal phase of BaTiO3 at room temperature, the magnetization orientation is found to switch from the out-of-plane to the in-plane in the rhombohedral phase below 180 K. The magnetization switching is attributed to the interfacial compressive strain transfer from BaTiO3 to [Cu/Ni] due to the structural phase transitions of BaTiO3. Magneto-optical polar Kerr measurement in the rhombohedral phase with and without applying an electric field supports the description that the magnetization switching arises from the compressive strain at the interface induced by the structural phase transition from the orthorhombic to rhombohedral phases.

    DOI: 10.1109/NANO.2017.8117394

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    Other Link: http://orcid.org/0000-0003-3683-5416

  31. Magnetization Reversal in Fe/BaTiO3(110) Heterostructured Multiferroics Reviewed

    Gorige Venkataiah, Swain Anupama, Komatsu Katsuyoshi, Itoh Mitsuru, Taniyama Tomoyasu

    PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS   Vol. 11 ( 11 )   2017.11

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    DOI: 10.1002/pssr.201700294

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  32. Crystal structure and magnetism in kappa-Al2O3-type AlxFe2-xO3 films on SrTiO3(111) Reviewed

    Hamasaki Yosuke, Shimizu Takao, Yasui Shintaro, Shiraishi Takahisa, Akama Akihiro, Kiguchi Takanori, Taniyama Tomoyasu, Itoh Mitsuru

    JOURNAL OF APPLIED PHYSICS   Vol. 122 ( 1 )   2017.7

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    DOI: 10.1063/1.4990947

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  33. Surface morphology and dielectric behavior of perovskite SrTiO3 thin film in heterostructure electroluminescence devices Reviewed

    Takashima Hiroshi, Cho Myunghee, Taniyama Tomoyasu, Itoh Mitsuru

    CURRENT APPLIED PHYSICS   Vol. 17 ( 5 ) page: 657-660   2017.5

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    DOI: 10.1016/j.cap.2017.02.012

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  34. Electric-field-driven domain wall dynamics in perpendicularly magnetized multilayers Reviewed

    Gonzalez Diego Lopez, Shirahata Yasuhiro, Van de Wiele Ben, Franke Kevin J. A., Casiraghi Arianna, Taniyama Tomoyasu, van Dijken Sebastiaan

    AIP ADVANCES   Vol. 7 ( 3 )   2017.3

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    DOI: 10.1063/1.4979267

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  35. 高濃度ビスマス置換ネオジム鉄ガーネット薄膜の高周波数特性の評価

    婁 庚健, 石橋 隆幸, 松本 悠人, 枦 修一郎, 石山 和志, 加藤 剛志, 岩田 聡, 安達 信泰, 谷山 智康

    電子情報通信学会技術研究報告   Vol. 116 ( 516 ) page: 49 - 52   2017.3

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  36. 電子ホログラフィ用狭画素ピッチ・スピン空間光変調器

    婁 庚健, 石橋 隆幸, 松本 悠人, 枦 修一郎, 石山 和志, 加藤 剛志, 岩田 聡, 安達 信泰, 谷山 智康

    HODC Circular   Vol. 36 ( 4 ) page: 1 - 7   2016.11

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  37. Evidence of ferroelectricity in ferrimagnetic kappa-Al2O3-type In0.25Fe1.75O3 films Reviewed

    Hamasaki Yosuke, Shimizu Takao, Yasui Shintaro, Taniyama Tomoyasu, Itoh Mitsuru

    APPLIED PHYSICS LETTERS   Vol. 109 ( 16 )   2016.10

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    DOI: 10.1063/1.4964826

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  38. Direct evidence for suppression of the Kondo effect due to pure spin current Reviewed

    Hamaya K., Kurokawa T., Oki S., Yamada S., Kanashima T., Taniyama T.

    PHYSICAL REVIEW B   Vol. 94 ( 14 )   2016.10

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    DOI: 10.1103/PhysRevB.94.140401

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  39. Crystal Isomers of ScFeO3 Reviewed

    Hamasaki Yosuke, Shimizu Takao, Yasui Shintaro, Taniyama Tomoyasu, Sakata Osami, Itoh Mitsuru

    CRYSTAL GROWTH & DESIGN   Vol. 16 ( 9 ) page: 5214-5222   2016.9

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    DOI: 10.1021/acs.cgd.6b00770

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  40. Latest impact factor Reviewed

    Vacha Martin, Ahn Jong-Hyun, Biju Vasudevan Pillai, Taniyama Tomoyasu, Tomita Ikuyoshi, Wang Shutao, Yang Jihui

    NPG ASIA MATERIALS   Vol. 8   2016.7

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    DOI: 10.1038/am.2016.101

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  41. Transmission of spin waves in ordered FeRh epitaxial thin films Reviewed

    Usami Takamasa, Suzuki Ippei, Itoh Mitsuru, Taniyama Tomoyasu

    APPLIED PHYSICS LETTERS   Vol. 108 ( 23 )   2016.6

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    DOI: 10.1063/1.4953464

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  42. Exchange coupling in metallic multilayers with a top FeRh layer Reviewed

    Yamada S., Tanikawa K., Hirayama J., Kanashima T., Taniyama T., Hamaya K.

    AIP ADVANCES   Vol. 6 ( 5 )   2016.5

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    DOI: 10.1063/1.4943606

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  43. Spin Conversion at Magnetic Interfaces Reviewed

    Tomoyasu Taniyama

    Spintronics for Next Generation Innovative Devices     page: 141 - 154   2016.1

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    This chapter reviews some recent developments in electron spin conversion technology. The mechanism of the conversion of electron spin into the photon helicity in GaAs is briefly described according to the optical transition selection rules in the radiative electron-hole recombination process. This is followed by a discussion on recent experimental results of spin injection into GaAs across a Fe3O4 spin filter. Optical spin orientation method, which coverts the photo helicity into the electron spin, is also described to examine the spin-filtering effect at a Fe/AlGaAs interface, the efficiency of which can be optimized by electric voltage across the interface. The effect of injecting spin-polarized electrons into a chemically ordered FeRh alloy which shows the antiferromagnetic-ferromagnetic phase transition is presented in order to see how spin-polarized electrons influence the magnetic phase transition. The chapter concludes with the future prospect of spintronics technology.

    DOI: 10.1002/9781118751886.ch8

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  44. Electric-field control of magnetism via strain transfer across ferromagnetic/ferroelectric interfaces Reviewed

    Taniyama Tomoyasu

    JOURNAL OF PHYSICS-CONDENSED MATTER   Vol. 27 ( 50 )   2015.12

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    DOI: 10.1088/0953-8984/27/50/504001

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  45. Sequential write-read operations in FeRh antiferromagnetic memory Reviewed

    Moriyama Takahiro, Matsuzaki Noriko, Kim Kab-Jin, Suzuki Ippei, Taniyama Tomoyasu, Ono Teruo

    APPLIED PHYSICS LETTERS   Vol. 107 ( 12 )   2015.9

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    DOI: 10.1063/1.4931567

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  46. Low-temperature B2 ordering and magnetic properties of Fe100-xRhx films on bcc alloys Reviewed

    Yamada S.

    Physical Review B - Condensed Matter and Materials Physics   Vol. 92 ( 9 )   2015.9

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    DOI: 10.1103/PhysRevB.92.094416

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  47. Barkhausen-like antiferromagnetic to ferromagnetic phase transition driven by spin polarized current Reviewed

    Suzuki Ippei, Naito Tomoyuki, Itoh Mitsuru, Taniyama Tomoyasu

    APPLIED PHYSICS LETTERS   Vol. 107 ( 8 )   2015.8

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    DOI: 10.1063/1.4929695

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  48. Lateral electric-field control of giant magnetoresistance in Co/Cu/Fe/BaTiO<inf>3</inf>multiferroic heterostructure Reviewed

    Savitha Pillai S.

    Applied Physics Letters   Vol. 107 ( 7 )   2015.8

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    DOI: 10.1063/1.4929339

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  49. Growth and characterization of Cu2ZnSn(SxSe1-x)(4) single crystal grown by traveling heater method Reviewed

    Nagaoka Akira, Katsube Ryoji, Nakatsuka Shigeru, Yoshino Kenji, Taniyama Tomoyasu, Miyake Hideto, Kakimoto Koichi, Scarpulla Michael A., Nose Yoshitaro

    JOURNAL OF CRYSTAL GROWTH   Vol. 423   page: 9-15   2015.8

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    DOI: 10.1016/j.jcrysgro.2015.04.012

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  50. Electric-field switching of perpendicularly magnetized multilayers Reviewed

    Shirahata Yasuhiro, Shiina Ryota, Gonzalez Diego Lopez, Franke Kevin J. A., Wada Eiji, Itoh Mitsuru, Pertsev Nikolay A., van Dijken Sebastiaan, Taniyama Tomoyasu

    NPG ASIA MATERIALS   Vol. 7   2015.7

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    DOI: 10.1038/am.2015.72

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  51. Current induced antiferro-ferromagnetic transition in FeRh nanowires Reviewed

    Matsuzaki Noriko, Moriyama Takahiro, Nagata Masaki, Kim Kab-Jin, Suzuki Ippei, Taniyama Tomoyasu, Ono Teruo

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 54 ( 7 )   2015.7

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    DOI: 10.7567/JJAP.54.073002

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  52. Interfacial spin-glass-like state in Mn5Ge3 single crystalline films grown on germanium substrates Reviewed

    Truong A.

    Physical Review B - Condensed Matter and Materials Physics   Vol. 91 ( 21 )   2015.6

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    DOI: 10.1103/PhysRevB.91.214425

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  53. Reversible Electric-Field-Driven Magnetic Domain-Wall Motion Reviewed

    Franke Kevin J. A., Van de Wiele Ben, Shirahata Yasuhiro, Hamalainen Sampo J., Taniyama Tomoyasu, van Dijken Sebastiaan

    PHYSICAL REVIEW X   Vol. 5 ( 1 )   2015.2

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    DOI: 10.1103/PhysRevX.5.011010

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  54. Strain-controlled MO effect on highly Bi-substituted Neodymium Iron Gallium Garnet thin films Reviewed

    Sasaki Michimasa, Lou Gengjian, Hashinaka Takahiro, Meguro Akira, Ninomiya Minami, Ishibashi Takayuki, Taniyama Tomoyasu

    20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015   Vol. 75   page: 1370-1375   2015

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    DOI: 10.1016/j.phpro.2015.12.153

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  55. Controllable exchange bias in Fe/metamagnetic FeRh bilayers Reviewed

    Suzuki Ippei, Hamasaki Yosuke, Itoh Mitsuru, Taniyama Tomoyasu

    APPLIED PHYSICS LETTERS   Vol. 105 ( 17 )   2014.10

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    DOI: 10.1063/1.4900619

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  56. Controllable exchange bias in Fe/metamagnetic FeRh bilayers Reviewed

    Suzuki I.

    Applied Physics Letters   Vol. 105 ( 17 )   2014.10

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    DOI: 10.1063/1.4900619

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  57. Thermo-physical properties of Cu2ZnSnS4 single crystal Reviewed

    Nagaoka Akira, Yoshino Kenji, Aoyagi Kenta, Minemoto Takashi, Nose Yoshitaro, Taniyama Tomoyasu, Kakimoto Koichi, Miyake Hideto

    JOURNAL OF CRYSTAL GROWTH   Vol. 393   page: 167-170   2014.5

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    DOI: 10.1016/j.jcrysgro.2013.11.077

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  58. Effects of sodium on electrical properties in Cu2ZnSnS4 single crystal Reviewed

    Nagaoka Akira, Miyake Hideto, Taniyama Tomoyasu, Kakimoto Koichi, Nose Yoshitaro, Scarpulla Michael A., Yoshino Kenji

    APPLIED PHYSICS LETTERS   Vol. 104 ( 15 )   2014.4

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    DOI: 10.1063/1.4871208

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  59. Epitaxial growth of metastable multiferroic AlFeO3 film on SrTiO3 (111) substrate Reviewed

    Hamasaki Yosuke, Shimizu Takao, Taniguchi Hiroki, Taniyama Tomoyasu, Yasui Shintaro, Itoh Mitsuru

    APPLIED PHYSICS LETTERS   Vol. 104 ( 8 )   2014.2

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    DOI: 10.1063/1.4866798

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  60. Perpendicularly magnetized spin filtering Cu/Ni multilayers Reviewed

    Shirahata Yasuhiro, Wada Eiji, Itoh Mitsuru, Taniyama Tomoyasu

    APPLIED PHYSICS LETTERS   Vol. 104 ( 3 )   2014.1

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    DOI: 10.1063/1.4862969

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  61. Growth and characterization of Cu2ZnSn(SxSe1-x)(4) alloys grown by the melting method Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Kakimoto Koichi, Miyake Hideto

    JOURNAL OF CRYSTAL GROWTH   Vol. 386   page: 204-207   2014.1

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    DOI: 10.1016/j.jcrysgro.2013.10.001

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  62. Elastically controlled magnetic phase transition in Ga-FeRh/BaTiO3(001) heterostructure Reviewed

    Suzuki Ippei, Itoh Mitsuru, Taniyama Tomoyasu

    APPLIED PHYSICS LETTERS   Vol. 104 ( 2 )   2014.1

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    DOI: 10.1063/1.4861455

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  63. Summary of ICF 11 Reviewed

    S. Nakagawa, T. Taniyama

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   Vol. 61   page: S5 - S13   2014

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    The 11th International Conference on Ferrites, ICF11, was successfully held on April 15-19, 2013, at the Okinawa Convention Center, Okinawa, Japan organized by The Japan Society of Powder and Powder Metallurgy. ICF 11 covered a broad range of topics related to the science and technology of ferrites and related materials.

    DOI: 10.2497/jjspm.61.S5

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  64. Correlation between intrinsic defects and electrical properties in the high-quality Cu2ZnSnS4 single crystal Reviewed

    Nagaoka Akira, Miyake Hideto, Taniyama Tomoyasu, Kakimoto Koichi, Yoshino Kenji

    APPLIED PHYSICS LETTERS   Vol. 103 ( 11 )   2013.9

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    DOI: 10.1063/1.4821279

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  65. Growth and characterization of Cu2ZnSnS4 single crystals Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Kakimoto Koichi, Miyake Hideto

    PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE   Vol. 210 ( 7 ) page: 1328-1331   2013.7

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    DOI: 10.1002/pssa.201200815

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  66. Electric field driven variation in magnetoresistance of Co/Cu/Fe/BaTiO3 heterostructure Reviewed

    Kojima Hidekazu, Naito Tomoyuki, Muraoka Hironobu, Wada Eiji, Suzuki Ippei, Shirahata Yasuhiro, Itoh Mitsuru, Taniyama Tomoyasu

    JOURNAL OF APPLIED PHYSICS   Vol. 113 ( 17 )   2013.5

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    DOI: 10.1063/1.4795819

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  67. Electric-voltage control of magnetism in Fe/BaTiO3 heterostructured multiferroics Reviewed

    Venkataiah G.

    Journal of Applied Physics   Vol. 113 ( 17 )   2013.5

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    DOI: 10.1063/1.4793511

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  68. Comparative study of phase transitions in BaTiO3 thin films grown on (001)- and (110)-oriented SrTiO3 substrate Reviewed

    Shimizu Takao, Suwama Dai, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

    JOURNAL OF PHYSICS-CONDENSED MATTER   Vol. 25 ( 13 )   2013.4

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    DOI: 10.1088/0953-8984/25/13/132001

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  69. Collapse of Magnetic Order of the Quasi One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 in Transverse Fields Reviewed

    Kimura Shojiro, Okunishi Koichi, Hagiwara Masayuki, Kindo Koichi, He Zhangzhen, Taniyama Tomoyasu, Itoh Mitsuru, Koyama Keiichi, Watanabe Kazuo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 82 ( 3 )   2013.3

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    DOI: 10.7566/JPSJ.82.033706

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  70. NPG Asia Materials celebrates a year of publishing original research Reviewed

    Vacha Martin, Choi Hee Cheul, Wang Shutao, Tomita Ikuyoshi, Taniyama Tomoyasu

    NPG ASIA MATERIALS   Vol. 5   2013.1

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    DOI: 10.1038/am.2012.72

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  71. Structural Modification and Domain Structure in a BaTiO3 Film on (110) SrTiO3 Reviewed

    Shimizu Takao, Suwama Dai, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

    APPLIED PHYSICS EXPRESS   Vol. 6 ( 1 )   2013.1

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    DOI: 10.7567/APEX.6.015803

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  72. Electrical Properties of Cu2ZnSnS4 Single Crystal Reviewed

    Nagaoka Akira, Yoshino Kenji, Miyake Hideto, Taniyama Tomoyasu, Kakimoto Koichi

    2013 IEEE 39TH PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)     page: 2621-2624   2013

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  73. Alternating domains with uniaxial and biaxial magnetic anisotropy in epitaxial Fe films on BaTiO3 Reviewed

    Lahtinen Tuomas H. E., Shirahata Yasuhiro, Yao Lide, Franke Kevin J. A., Venkataiah Gorige, Taniyama Tomoyasu, van Dijken Sebastiaan

    APPLIED PHYSICS LETTERS   Vol. 101 ( 26 )   2012.12

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    DOI: 10.1063/1.4773482

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  74. Growth of KH<inf>2</inf>PO<inf>4</inf>single crystal with an artificial isotope gradient Reviewed

    Osada K.

    Ferroelectrics   Vol. 440 ( 1 ) page: 25-30   2012.12

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    DOI: 10.1080/00150193.2012.743786

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  75. Anomalous relaxation in magnetoresistance of Fe/Fe-O granular system Reviewed

    Sakuma H.

    IEEJ Transactions on Fundamentals and Materials   Vol. 132 ( 10 ) page: 920-923   2012.10

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    DOI: 10.1541/ieejfms.132.920

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  76. Growth of Cu2ZnSnSe4 single crystals from Sn solutions Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Miyake Hideto

    JOURNAL OF CRYSTAL GROWTH   Vol. 354 ( 1 ) page: 147-151   2012.9

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    DOI: 10.1016/j.jcrysgro.2012.05.030

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  77. Origin of the dielectric response in Ba0.767Ca0.233TiO3 Reviewed

    Shimizu Takao, Fu Desheng, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

    APPLIED PHYSICS LETTERS   Vol. 100 ( 10 )   2012.3

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    DOI: 10.1063/1.3693524

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  78. Origin of the dielectric response in Ba<inf>0.767</inf>Ca<inf>0.233</inf>TiO<inf>3</inf> Reviewed

    Shimizu T.

    Applied Physics Letters   Vol. 100 ( 10 )   2012.3

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    DOI: 10.1063/1.3693524

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  79. Preparation of Cu2ZnSnS4 single crystals from Sn solutions Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Miyake Hideto

    JOURNAL OF CRYSTAL GROWTH   Vol. 341 ( 1 ) page: 38-41   2012.2

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    DOI: 10.1016/j.jcrysgro.2011.12.046

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  80. Preparation of Cu 2ZnSnS 4 single crystals from Sn solutions Reviewed

    Nagaoka A.

    Journal of Crystal Growth   Vol. 341 ( 1 ) page: 38-41   2012.2

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    DOI: 10.1016/j.jcrysgro.2011.12.046

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  81. Strain-induced reversible and irreversible magnetization switching in Fe/BaTiO<inf>3</inf>heterostructures Reviewed

    Venkataiah G.

    Journal of Applied Physics   Vol. 111 ( 3 )   2012.2

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    DOI: 10.1063/1.3684695

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  82. Temperature Dependence of Linear Thermal Expansion of CuGaSe2 Crystals Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniyama Tomoyasu, Miyake Hideto

    DEFECTS-RECOGNITION, IMAGING AND PHYSICS IN SEMICONDUCTORS XIV   Vol. 725   page: 171-+   2012

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    DOI: 10.4028/www.scientific.net/MSF.725.171

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  83. Growth of Cu2ZnSnS4 Single Crystal by Traveling Heater Method Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniguchi Hiroki, Taniyama Tomoyasu, Miyake Hideto

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 12 )   2011.12

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    DOI: 10.1143/JJAP.50.128001

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  84. Optically oriented electron spin transmission across ferromagnet/ semiconductor interfaces Reviewed

    Taniyama T.

    Proceedings of SPIE - The International Society for Optical Engineering   Vol. 8100   2011.10

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    DOI: 10.1117/12.892386

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  85. Two-qubit gate of combined single-spin rotation and interdot spin exchange in a double quantum dot Reviewed

    Brunner R.

    Physical Review Letters   Vol. 107 ( 14 )   2011.9

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    DOI: 10.1103/PhysRevLett.107.146801

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  86. Manipulation of magnetic coercivity of Fe film in Fe/BaTiO<inf>3</inf>heterostructure by electric field Reviewed

    Venkataiah G.

    Applied Physics Letters   Vol. 99 ( 10 )   2011.9

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    DOI: 10.1063/1.3628464

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  87. Switching of the symmetry of magnetic anisotropy in Fe/BaTiO<inf>3</inf>heterostructures Reviewed

    Shirahata Y.

    Applied Physics Letters   Vol. 99 ( 2 )   2011.7

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    DOI: 10.1063/1.3609237

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  88. Ferroelectricity and electromechanical coupling in (1-x)AgNbO3-xNaNbO(3) solid solutions Reviewed

    Fu Desheng, Arioka Takahiro, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru

    APPLIED PHYSICS LETTERS   Vol. 99 ( 1 )   2011.7

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    DOI: 10.1063/1.3609234

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  89. Electrical and optical spin injection in ferromagnet/semiconductor heterostructures Reviewed

    Taniyama Tomoyasu, Wada Eiji, Itoh Mitsuru, Yamaguchi Masahito

    NPG ASIA MATERIALS   Vol. 3   page: 65-73   2011.7

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    DOI: 10.1038/asiamat.2011.84

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  90. Peculiarities of Linear Thermal Expansion of CuInS2 Single Crystals Reviewed

    Nagaoka Akira, Yoshino Kenji, Taniyama Tomoyasu, Miyake Hideto

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 50 ( 5 )   2011.5

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    DOI: 10.1143/JJAP.50.05FB04

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  91. Inversion of spin dependent photocurrent at Fe3O4/modulation doped GaAs heterointerfaces Reviewed

    Shirahata Y., Wada E., Itoh M., Taniyama T.

    JOURNAL OF APPLIED PHYSICS   Vol. 109 ( 7 )   2011.4

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    DOI: 10.1063/1.3536668

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  92. Clear correspondence between magnetoresistance and magnetization of epitaxially grown ordered FeRh thin films Reviewed

    Suzuki Ippei, Naito Tomoyuki, Itoh Mitsuru, Sato Tetsuya, Taniyama Tomoyasu

    JOURNAL OF APPLIED PHYSICS   Vol. 109 ( 7 )   2011.4

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    DOI: 10.1063/1.3556754

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  93. Effect of spin polarized current on magnetic phase transition of ordered FeRh wires Reviewed

    Naito T.

    Journal of Applied Physics   Vol. 109 ( 7 )   2011.4

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    DOI: 10.1063/1.3553941

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  94. Novel Phase Transition Probed by Sound Velocity in Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 Reviewed

    Yamaguchi Hironori, Yasin Shadi, Zherlitsyn Sergei, Omura Kumiko, Kimuray Shojiro, Yoshii Shunsuke, Okunishi Kouichi, He Zhangzhen, Taniyama Tomoyasu, Itoh Mitsuru, Hagiwaraz Masayuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 80 ( 3 )   2011.3

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    DOI: 10.1143/JPSJ.80.033701

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  95. Ferroelectricity of Li-doped silver niobate (Ag, Li)NbO3 Reviewed

    Fu Desheng, Endo Makoto, Taniguchi Hiroki, Taniyama Tomoyasu, Itoh Mitsuru, Koshihara Shin-ya

    JOURNAL OF PHYSICS-CONDENSED MATTER   Vol. 23 ( 7 )   2011.2

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    DOI: 10.1088/0953-8984/23/7/075901

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  96. Triple quantum dot device designed for three spin qubits Reviewed

    Takakura T.

    Applied Physics Letters   Vol. 97 ( 21 )   2010.11

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    DOI: 10.1063/1.3518919

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  97. Spin polarized electron transmission into GaAs quantum well across Fe<inf>3</inf>O<inf>4</inf>: Optical spin orientation analysis Reviewed

    Wada E.

    Applied Physics Letters   Vol. 97 ( 17 )   2010.10

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    DOI: 10.1063/1.3509419

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  98. Inversion of Spin Photocurrent due to Resonant Transmission Reviewed

    Wada E., Shirahata Y., Naito T., Itoh M., Yamaguchi M., Taniyama T.

    PHYSICAL REVIEW LETTERS   Vol. 105 ( 15 )   2010.10

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    DOI: 10.1103/PhysRevLett.105.156601

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  99. Field Induced Lattice Deformation in a Quasi-One-Dimensional Antiferromagnet BaCo2V2O8 Reviewed

    Kimura Shojiro, Narumi Yasuo, Terada Noriki, Tanaka Yoshikazu, Iwaki Masahiro, Katsumata Koichi, Hagiwara Masayuki, Kindo Koichi, He Zhangzhen, Taniyama Tomoyasu, Itoh Mitsuru, Toyokawa Hidenori, Ishikawa Tetsuya, Kitamura Hideo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 79 ( 4 )   2010.4

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    DOI: 10.1143/JPSJ.79.043706

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  100. Efficient spin injection into GaAs quantum well across Fe3O4 spin filter Reviewed

    Wada E., Watanabe K., Shirahata Y., Itoh M., Yamaguchi M., Taniyama T.

    APPLIED PHYSICS LETTERS   Vol. 96 ( 10 )   2010.3

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    DOI: 10.1063/1.3357436

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  101. Coherent manipulation of individual electron spin in a double quantum dot integrated with a micromagnet Reviewed

    Obata Toshiaki, Pioro-Ladriere Michel, Tokura Yasuhiro, Shin Yun-Sok, Kubo Toshihiro, Yoshida Katsuharu, Taniyama Tomoyasu, Tarucha Seigo

    PHYSICAL REVIEW B   Vol. 81 ( 8 )   2010.2

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    DOI: 10.1103/PhysRevB.81.085317

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  102. Spin polarization of electrons injected from Fe into GaAs quantum well characterized using oblique Hanle effect Reviewed

    Wada Eiji, Itoh Mitsuru, Taniyama Tomoyasu, Yamaguchi Masahito

    NOVEL MATERIALS AND DEVICES FOR SPINTRONICS   Vol. 1183   page: 57-+   2010

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  103. Phonon Dynamics in BiFeO3 Studied by Raman Scattering Reviewed

    Shimizu Takao, Era Takuro, Taniguchi Hiroki, Fu Desheng, Taniyama Tomoyasu, Itoh Mitsuru

    FERROELECTRICS   Vol. 403   page: 187-190   2010

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    DOI: 10.1080/00150191003751422

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  104. Magnetic Anisotopy of Glassy Ferromagnet/Ferroelectrics Heterostructures Reviewed

    T. Taniyama, Y. Shirahata, M. Itoh, P. Sharma, M. Fukuhara, A. Inoue

    Proceedings of the Visual-JW2010     page: 306-307   2010

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  105. Fe/MgO Tunnel Barrier Contact for Electrical Spin Injection into GaAs for Semiconductor Spintronics Applications Reviewed

    M. M. Uddin, E. Wada, Y. Shirahata, T. Taniyama

    Proceedings of National Conference on Materials Science & Technology for Sustainable Development: Bangladesh Perspective     page: 42-45   2010

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  106. Spin-related current suppression in a semiconductor quantum dot spin-diode structure Reviewed

    Hamaya K.

    Physical Review Letters   Vol. 102 ( 23 )   2009.6

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    DOI: 10.1103/PhysRevLett.102.236806

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  107. Low-temperature ordering in FePt films deposited by gas flow sputtering Reviewed

    H. Sakuma, H. Kawano, K. Ishii, T. Taniyama

    J. Magn. Soc. Jpn.   Vol. 33 ( 3 ) page: 167 - 170   2009.5

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    DOI: 10.3379/msjmag.0903RD8093

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  108. Stability of ferromagnetic state of epitaxially grown ordered FeRh thin films Reviewed

    Suzuki Ippei, Koike Takayoshi, Itoh Mitsuru, Taniyama Tomoyasu, Sato Tetsuya

    JOURNAL OF APPLIED PHYSICS   Vol. 105 ( 7 )   2009.4

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    DOI: 10.1063/1.3054386

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  109. Artificially controlled magnetic domain structures in ferromagnetic dots/ferroelectric heterostructures Reviewed

    Taniyama Tomoyasu, Akasaka Kyohei, Fu Desheng, Itoh Mitsuru

    JOURNAL OF APPLIED PHYSICS   Vol. 105 ( 7 )   2009.4

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    DOI: 10.1063/1.3054357

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  110. Ferromagnetism and Electronic Structures of Nonstoichiometric Heusler-Alloy Fe3-xMnxSi Epilayers Grown on Ge(111) Reviewed International journal

    K. Hamaya, H. Itoh, O. Nakatsuka, K. Ueda, K. Yamamoto, M. Itakura, T. Taniyama, T. Ono, M. Miyao

    PHYSICAL REVIEW LETTERS   Vol. 102 ( 13 ) page: 137204/1 - 4   2009.4

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    For the study of ferromagnetic materials which are compatible with group-IV semiconductor spintronics, we demonstrate control of the ferromagnetic properties of Heusler-alloy Fe3-xMnxSi epitaxially grown on Ge(111) by tuning the Mn composition x. Interestingly, we obtain L2(1)-ordered structures even for nonstoichiometric atomic compositions. The Curie temperature of the epilayers with x approximate to 0.6 exceeds 300 K. Theoretical calculations indicate that the electronic structures of the nonstoichiometric Fe3-xMnxSi alloys become half-metallic for 0.75 &lt;= x &lt;= 1.5. We discuss the possibility of room-temperature ferromagnetic Fe3-xMnxSi/Ge epilayers with high spin polarization.

    DOI: 10.1103/PhysRevLett.102.137204

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    Other Link: http://orcid.org/0000-0003-3683-5416

  111. Selective Addressing of Single Electron Spins in a Semiconductor Double Quantum Dot Integrated with a Micro-Magnet Reviewed

    Obata Toshiaki, Pioro-Ladriere Michel, Tokura Yasuhiro, Shin Yun-Sok, Kubo Toshihiro, Yoshida Katsuharu, Taniyama Tomoyasu, Tarucha Seigo

    PHYSICS OF SEMICONDUCTORS   Vol. 1199   page: 381-+   2009

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  112. Dynamical polarization effect of nuclear spin bath dragged by electron spin resonance in double quantum dot integrated with micro-magnet Reviewed

    Obata T., Pioro-Ladriere M., Tokura Y., Brunner R., Shin Y. -S., Kubo T., Yoshida K., Taniyama T., Tarucha S.

    16TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON 16)   Vol. 193   2009

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    DOI: 10.1088/1742-6596/193/1/012046

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  113. Synthesis and Magnetic Properties of Ba2Mn2Si2O9: the First Example of S=2 Spin-Dimer with Spin-Singlet Ground Reviewed International journal

    Zhangzhen He, Myung-Hwan Wangbo, Yutaka Ueda, Yasuo Narumi, Koichi Kindo, Tomoyasu Taniyama, Mitsuru Itoh, Wendan Cheng

    CHEMISTRY-AN ASIAN JOURNAL   Vol. 4 ( 10 ) page: 1530 - 1535   2009

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    DOI: 10.1002/asia.200900235

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    Other Link: http://orcid.org/0000-0003-3683-5416

  114. Low temperature magnetism of the S=1/2 quasi one-dimensional Ising-like anitiferromagnet BaCo2V2O8 Reviewed International journal

    S. Kimura, T. Takeuchi, M. Hagiwara, K. Okunishi, Z. He, T. Taniyama, M. Itoh

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   Vol. 150 ( 4 ) page: 042090/1 - 4   2009

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    We report the results of thermodynamic measurements on the quasi one-dimensional (1D) Ising-like antiferromagnet BaCo2V2O8 in the magnetic fields for H//c down to 200 mK. An appearance of a long range magnetic ordered phase is observed in the field induced region above H-c similar or equal to 3.9 T at temperature below 1.8 K. A peculiar incommensurate ordering, which reflects a quantum critical nature of S = 1/2 1D Ising-like antiferromagnet, realizes in this ordered phase.

    DOI: 10.1088/1742-6596/150/4/042090

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  115. Tunneling magnetoresistance effect in a few-electron quantum-dot spin valve Reviewed International journal

    K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, S. Ishida, T. Taniyama, K. Hirakawa, Y. Arakawa, T. Machida

    APPLIED PHYSICS LETTERS   Vol. 93 ( 22 ) page: 222107/1 - 3   2008.12

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    We demonstrate the tunneling magnetoresistance (TMR) effect through a semiconductor quantum dot (QD) with a few electrons in a lateral QD spin-valve device. At one-to-two electron transition, only inverse TMR effect is observed, where the TMR ratio is relatively large compared with the value based on the Julliere model. When the bias window reaches near the charging energy of the QD, the inverse TMR almost disappears. These features can be interpreted in terms of spin transport via the ground state of a two-electron QD.

    DOI: 10.1063/1.3042098

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  116. Longitudinal Spin Density Wave Order in a Quasi-1D Ising-like Quantum Antiferromagnet Reviewed International journal

    S. Kimura, M. Matsuda, T. Masuda, S. Hondo, K. Kaneko, N. Metoki, M. Hagiwara, T. Takeuchi, K. Okunishi, Z. He, K. Kindo, T. Taniyama, M. Itoh

    PHYSICAL REVIEW LETTERS   Vol. 101 ( 20 ) page: 207201/1 - 4   2008.11

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    From neutron diffraction measurements on a quasi-1D Ising-like Co2+ spin compound BaCo2V2O8, we observed an appearance of a novel type of incommensurate ordering in magnetic fields. This ordering is essentially different from the Neel-type ordering, which is expected for the classical system, and the peculiar spin structure is caused by quantum fluctuation inherent in the quantum spin chain. A Tomonaga-Luttinger liquid nature characteristic of the gapless quantum 1D system is responsible for the realization of the incommensurate ordering.

    DOI: 10.1103/PhysRevLett.101.207201

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  117. Reply to Comment on "Origin of Giant Dielectric Response in Nonferroelectric CaCu3Ti4O12: Inhomogeneous Conduction Nature Probed by Atomic Force Microscopy" Reviewed International journal

    Desheng Fu, Hiroki Taniguchi, Tomoyasu Taniyama, Mitsuru Itoh, Shin-ya Koshihara

    CHEMISTRY OF MATERIALS   Vol. 20 ( 19 ) page: 6286 - 6287   2008.10

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    DOI: 10.1021/cm801905d

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  118. Electrically driven single-electron spin resonance in a slanting Zeeman field Reviewed International journal

    M. Pioro-Ladriere, T. Obata, Y. Tokura, Y. -S. Shin, T. Kubo, K. Yoshida, T. Taniyama, S. Tarucha

    NATURE PHYSICS   Vol. 4 ( 10 ) page: 776 - 779   2008.10

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    The rapid rise of spintronics and quantum information science has led to a strong interest in developing the ability to coherently manipulate electron spins(1). Electron spin resonance(2) is a powerful technique for manipulating spins that is commonly achieved by applying an oscillating magnetic field. However, the technique has proven very challenging when addressing individual spins(3-5). In contrast, by mixing the spin and charge degrees of freedom in a controlled way through engineered non-uniform magnetic fields, electron spin can be manipulated electrically without the need of high-frequency magnetic fields(6,7). Here we report experiments in which electrically driven addressable spin rotations on two individual electrons were realized by integrating a micrometre-size ferromagnet into a double-quantum-dot device. We find that it is the stray magnetic field of the micromagnet that enables the electrical control and spin selectivity. The results suggest that our approach can be tailored to multidot architecture and therefore could open an avenue towards manipulating electron spins electrically in a scalable way.

    DOI: 10.1038/nphys1053

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    Other Link: http://orcid.org/0000-0003-3683-5416

  119. Carrier induced magnetic anomalies in Mn-doped AgGaSe(2) magnetic semiconductor Reviewed International journal

    Kenji Yoshino, Aya Kinoshita, Yasuhiro Shirahata, Tetuo Ikari, Tomoyasu Taniyama

    JOURNAL OF APPLIED PHYSICS   Vol. 103 ( 7 ) page: 07D103/1 - 3   2008.4

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    Magnetic behaviors of the magnetic semiconductor Mn-doped AgGaSe(2) with no secondary phases are reported. Magnetization measurements show that Mn-doped AgGaSe(2) exhibits a superparamagnetic behavior while undoped AgGaSe(2) shows diamagnetism. Significant anomalies are also seen in the temperature dependent ac susceptibility and specific heat at 190 and 275 K. These results indicate that the substitution of Mn induces magnetism in AgGaSe(2). The origin of the magnetic behaviors is discussed on the basis of the combined results of susceptibility, specific heat, and photoluminescence.

    DOI: 10.1063/1.2831500

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  120. Optically spin oriented electron transmission across fully epitaxial Fe(3)O(4)/GaAs(001) interfaces Reviewed International journal

    T. Taniyama, T. Mori, K. Watanabe, E. Wada, M. Itoh, H. Yanagihara

    JOURNAL OF APPLIED PHYSICS   Vol. 103 ( 7 ) page: 07D705/1 - 3   2008.4

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    We demonstrate fully epitaxial growth of Fe(3)O(4)/GaAs(001) heterostructures using a reactive molecular beam epitaxy (MBE) method. The Fe(3)O(4) film was obtained by oxidizing an ultrathin Fe layer into an Fe(3)O(4) seed layer in an O(2) atmosphere at 260 degrees C, followed by the reactive MBE growth of Fe(3)O(4). The Fe(3)O(4) seed layer effectively works as a template for the successive growth of Fe(3)O(4). Also, a clear spin filtering effect of optically spin oriented electrons at the Fe(3)O(4)/GaAs(001) interface is shown at room temperature. The results clearly demonstrate that the spin filtering effect occurs at the Fe(3)O(4)/GaAs(001) interface and has its origin in the spin split density of states of the Fe(3)O(4) layer. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2832415

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  121. Crossover of electron transmission mechanism and spin filtering effect at Fe/GaAs(001) interfaces Reviewed International journal

    E. Wada, M. Itoh, T. Taniyama

    JOURNAL OF APPLIED PHYSICS   Vol. 103 ( 7 ) page: 07A702/1 - 3   2008.4

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    A clear correlation between the spin filtering effect of optically pumped spin-polarized electrons at Fe/GaAs(001) Schottky interfaces and its electron transmission mechanism is reported. Current-voltage (I-V) characteristics of the Schottky diode demonstrate tunneling and thermionic emission transmission processes in the low and high bias voltage regions, respectively. A spin filtering current contribution, on the other hand, exhibits a significant peak at a particular bias voltage while spin selectivity shows a shoulder at the same bias voltage. The bias voltage where the features occur corresponds well to the crossover regime of the electron transmission mechanisms. The spin selectivity also shows a field dependence similar to the magnetization curve, assuring that the spin selectivity has its origin in the spin filtering effect. (c) 2008 American Institute of Physics.

    DOI: 10.1063/1.2829904

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  122. Piezoelectric properties of lithium modified silver niobate perovskite single crystals Reviewed International journal

    Desheng Fu, Makoto Endo, Hiroki Taniguchi, Tomoyasu Taniyama, Shin-ya Koshihara, Mitsuru Itoh

    APPLIED PHYSICS LETTERS   Vol. 92 ( 17 ) page: 172905/1 - 3   2008.4

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    We report the growth and the piezoelectric properties of lead-free perovskite single crystals of Ag1-xLixNbO3. It possesses a rhombohedral structure with high ferroelectric phase transition (T-c=548 K for x=0.086) and large spontaneous polarization (P-s similar to 40 mu C/cm(2) for x=0.062) along the < 111 >(c) direction of pseudocubic perovskite structure for x>0.05-0.06. High quasistatic d(33)similar to 210 pC/N and low dielectric constant have lead to a very large value of piezoelectric voltage constant g(33)similar to 53.9x10(-3) Vm/N for the < 001 >(c)-cut crystal of this simple perovskite. It has been shown that Li substitution might enhance the piezoelectric coefficient of the crystal. The excellent piezo-/ferroelectricity of this system are considered to be facilitated by the strong polarization nature of both Ag and Li in the perovskite structure. Our findings may stimulate further interests in the development of lead-free piezoelectrics. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2918837

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  123. Size dependence of martensite transformation temperature in ferromagnetic shape memory alloy FePd Reviewed International journal

    Kenta Seki, Hiroaki Kura, Tetsuya Sato, Tomoyasu Taniyama

    JOURNAL OF APPLIED PHYSICS   Vol. 103 ( 6 ) page: 63910/1 - 9   2008.3

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    Martensite transformation temperature of ferromagnetic shape memory alloy FePd was studied in the shape of nanoparticle and the polycrystalline samples with grain size in micrometers based on the x- ray diffraction and magnetic measurement as a function of sample size. Both the forward transformation start temperature M(s) and reverse transformation finish temperature A(f) of polycrystalline sample monotonically decreased with decreasing grain size and were not observed in the nanoparticles. The size dependence of transformation temperature is explained based on the change in transformation mode, i. e., the decrease in sample size induces the change from the multivariant mode to single variant mode in which the strain energy is large. In the small sample, the strain energy becomes large, and thus the large driving force is required for the transformation. As a result, the large amount of undercooling occurs, which leads to the lowering of Ms. The measurement of heat capacity indicates that the strain energy is elastically stored without dispersion in the transformation process even in the small size because the volume change of FePd at the transformation is very small. The large elastic strain energy works as the driving force to reverse transformation, and then the lowering of Af is induced. Therefore, the lowering of transformation temperature in FePd is characterized by the lowering of thermodynamic equilibrium temperature. (C) 2008 American Institute of Physics.

    DOI: 10.1063/1.2890143

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  124. Origin of giant dielectric response in nonferroelectric CaCu3Ti4O12: Inhomogeneous conduction nature probed by atomic force microscopy Reviewed International journal

    Desheng Fu, Hiroki Taniguchi, Tomoyasu Taniyama, Mitsuru Itoh, Shin-ya Koshihara

    CHEMISTRY OF MATERIALS   Vol. 20 ( 5 ) page: 1694 - 1698   2008.3

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    Local probing of conduction behaviors using atomic force microscopy clearly shows that the grain boundary of polycrystalline CaCu3Ti4O12 is Semiconducting. In contrast, the grain is a mixture of semiconductinc, and insulating regions. This inhomogeneous conductive feature leads to giant dielectric response in CaCu3Ti4O12. Theoretical analysis demonstrates that the dielectric response follows a typical Debye-type relaxation, and its unusual temperature dependence originates from the thermal activation behavior of free carries within the semiconducting regions in the grain. An effective way to control the electrical properties of CCTO is to control the defect density within a grain rather than the grain boundary.

    DOI: 10.1021/cm0710507

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    Other Link: http://orcid.org/0000-0003-3683-5416

  125. High temperature ferromagnetism in single crystalline dilute Fe-doped BaTiO3 Reviewed International journal

    Sugata Ray, Priya Mahadevan, Suman Mandal, S. R. Krishnakumar, Carlos Seiti Kuroda, T. Sasaki, Tomoyasu Taniyama, Mitsuru Itoh

    PHYSICAL REVIEW B   Vol. 77 ( 10 ) page: 104416/1 - 6   2008.3

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    We report the observation of room temperature ferromagnetism in high quality, single crystalline dilute Fe-doped BaTiO3. The large equilibrium solubility of Fe ions in the matrix refutes uncertainties about secondary phase magnetism, which has often eclipsed this interesting field of research. While room temperature ferromagnetism is observed at and above 5% Fe concentrations, one finds a highly concave temperature dependence of the susceptibility. Using detailed ab initio calculation, this has been related to intrinsic magnetic inhomogeneities arising from positional disorder. Apart from providing a mechanism for the observed high temperature ferromagnetism, our results point out that intrinsic disorder is a generic and essential component of dilute magnetism.

    DOI: 10.1103/PhysRevB.77.104416

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    Other Link: http://orcid.org/0000-0003-3683-5416

  126. Structural and magnetic characterization of Mn-doped ZnO films grown by spray pyrolysis method Reviewed International journal

    Kenji Yoshino, Satoshi Oyama, Minoru Yoneta, Tomoyasu Taniyama

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   Vol. 148 ( 1-3 ) page: 234 - 236   2008.2

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    Mn-doped ZnO films on Si substrate could be grown by the spray pyrolysis method at 500 degrees C under an air atmosphere. Although the orientation (0 0 0 2) peak intensity became small with increasing Mn concentration, the lattice constant of the c-axis expanded monotonously with increasing Mn concentration. This indicated that the Mn ion was understood to have occupied the Zn site without changing wurtzite structure. Furthermore, the magnetic signal which increased with decreasing temperature was presumably due to superparamagnetic clusters in the ZnO film because (chi - chi(0))(-1), chi and chi(0) represented the susceptibility and the temperature-independent paramagnetic contribution from the substrate, respectively, could be well fitted with the Curie law, giving almost zero Curie temperature. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.mseb.2007.09.074

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  127. Novel ordering of an S=1/2 quasi-1D Ising-like antiferromagnet in magnetic field Reviewed International journal

    S. Kimura, T. Takeuchi, K. Okunishi, M. Hagiwara, Z. He, K. Kindo, T. Taniyama, M. Itoh

    PHYSICAL REVIEW LETTERS   Vol. 100 ( 5 ) page: 057202/1 - 4   2008.2

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    High-field specific heat measurements on BaCo2V2O8, which is a good realization of an S=1/2 quasi-one-dimensional (1D) Ising-like antifferomagnet, have been performed in magnetic fields up to 12 T along the chain and at temperature down to 200 mK. We have found a new magnetic ordered state in the field-induced phase above H-c similar or equal to 3.9 T. We suggest that a novel type of the incommensurate order, which is caused by the quantum effect inherent in the S = 1/2 quasi-1D Ising-like antiferromagnet, appears in the field-induced phase.

    DOI: 10.1103/PhysRevLett.100.057202

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    Other Link: http://orcid.org/0000-0003-3683-5416

  128. Oscillatory changes in the tunneling magnetoresistance effect in semiconductor quantum-dot spin valves Reviewed International journal

    K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, S. Ishida, T. Taniyama, K. Hirakawa, Y. Arakawa, T. Machida

    PHYSICAL REVIEW B   Vol. 77 ( 8 ) page: 081302(R)/1 - 4   2008.2

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    We experimentally study the tunneling magnetoresistance (TMR) effect as a function of bias voltage (V-SD) in lateral Ni/InAs/Ni quantum-dot (QD) spin valves showing Coulomb blockade characteristics. With varying V-SD, the TMR value oscillates and the oscillation period corresponds to conductance changes observed in the current-voltage (I-V-SD) characteristics. We also find an inverse TMR effect near V-SD values where negative differential conductance is observed. A possible mechanism of the TMR oscillation is discussed in terms of spin accumulation on the QD and spin-dependent transport properties via excited states.

    DOI: 10.1103/PhysRevB.77.081302

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  129. Selective Manipulation of Electron Spins with Electric Fields Reviewed

    Pioro-Ladriere Michel, Obata Toshiaki, Tokura Yasuhiro, Shin You-Sok, Kubo Toshihiro, Yoshida Katsuharu, Taniyama Tomoyasu, Tarucha Seigo

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT   ( 176 ) page: 322-340   2008

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  130. Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes Reviewed International journal

    K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. Machida, T. Taniyama, S. Ishida

    APPLIED PHYSICS LETTERS   Vol. 91 ( 23 ) page: 232105/1 - 3   2007.12

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    Using a laterally fabricated quantum-dot (QD) spin-valve device, we experimentally study the Kondo effect in the electron transport through a semiconductor QD with an odd number of electrons (N). In a parallel magnetic configuration of the ferromagnetic electrodes, the Kondo resonance at N=3 splits clearly without external magnetic fields. With applying magnetic fields (B), the splitting is gradually reduced, and then the Kondo effect is almost restored at B=1.2 T. This means that, in the Kondo regime, an inverse effective magnetic field of B similar to 1.2 T can be applied to the QD in the parallel magnetic configuration of the ferromagnetic electrodes. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2820445

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  131. Field-induced order-disorder transition in antiferromagnetic BaCo2V2O8 driven by a softening of spinon excitation Reviewed International journal

    S. Kimura, H. Yashiro, K. Okunishi, M. Hagiwara, Z. He, K. Kindo, T. Taniyama, M. Itoh

    PHYSICAL REVIEW LETTERS   Vol. 99 ( 8 ) page: 087602/1 - 4   2007.8

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    High field magnetization and ESR measurements on the quasi-one-dimensional (1D) antiferromagnet BaCo2V2O8 have been performed in magnetic fields up to 50 T along the chain. The experimental results are explained well in terms of a 1D S=1/2 antiferromagnetic XXZ model in longitudinal fields. We show that the quantum phase transition from the Neel ordered phase to the spin liquid one in the model is responsible for a peculiar order to disorder transition in BaCo2V2O8.

    DOI: 10.1103/PhysRevLett.99.087602

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    Other Link: http://orcid.org/0000-0003-3683-5416

  132. Electric-field control of tunneling magnetoresistance effect in a Ni/InAs/Ni quantum-dot spin valve Reviewed International journal

    K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. Machida, T. Taniyama, S. Ishida, Y. Arakawa

    APPLIED PHYSICS LETTERS   Vol. 91 ( 2 ) page: 022107/1 - 3   2007.7

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    The authors demonstrate an electric-field control of tunneling magnetoresistance (TMR) effect in a semiconductor quantum-dot spin-valve device. By using ferromagnetic Ni nanogap electrodes, they observe the Coulomb blockade oscillations at a small bias voltage. In the vicinity of the Coulomb blockade peak, the TMR effect is significantly modulated and even its sign is switched by changing the gate voltage, where the sign of the TMR value changes at the resonant condition. (C) 2007 American Institute of Physics.

    DOI: 10.1063/1.2759264

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  133. Flux growth and magnetic anomalies of Co3V2O8 crystals Reviewed International journal

    Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh, Yutaka Ueda

    CRYSTAL GROWTH & DESIGN   Vol. 7 ( 6 ) page: 1055 - 1057   2007.6

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    Large single crystals of the novel vanadate Co3V2O8 are grown at a slow cooling rate using the flux method. X-ray diffraction and chemical analyses show that the grown crystals have high quality. Magnetic susceptibility and heat capacity measurements confirm that Co3V2O8 exhibits unusual magnetic behaviors, where five magnetic phase transitions occur below 15 K along the magnetic easy a-axis.

    DOI: 10.1021/cg060539u

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    Other Link: http://orcid.org/0000-0003-3683-5416

  134. AgNbO3: A lead-free material with large polarization and electromechanical response Reviewed International journal

    Desheng Fu, Makoto Endo, Hiroki Taniguchi, Tomoyasu Taniyama, Mitsuru Itoh

    APPLIED PHYSICS LETTERS   Vol. 90 ( 25 ) page: 252907/1 - 3   2007.6

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    Polarization measurements reveal that AgNbO3 has an extremely large polarization, which can reach a value of 52 mu C/cm(2) in polycrystals. Experiments also show that the large internal atom distortion in AgNbO3 is also strongly coupled to the electric field, indicating that high piezoelectric performance can be realized in AgNbO3 system. This finding opens the way to designing a new class of lead-free, high-performance piezoelectric materials based on AgNbO3. (c) 2007 American Institute of Physics.

    DOI: 10.1063/1.2751136

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  135. Electrical voltage manipulation of ferromagnetic microdomain structures in a ferromagnetic/ferroelectric hybrid structure Reviewed International journal

    T. Taniyama, K. Akasaka, D. Fu, M. Itoh, H. Takashima, B. Prijamboedi

    JOURNAL OF APPLIED PHYSICS   Vol. 101 ( 9 ) page: 09F512/1 - 3   2007.5

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    We report on electrical bias voltage manipulation of the magnetic domain structures of patterned ferromagnetic Fe dots on a ferroelectric BaTiO(3) underlayer using a scanning probe microscope technique. Piezoresponse force microscopy is used to apply local electric field on the Fe dots/BaTiO(3) hybrid structure and to map the ferroelectric domain structures simultaneously. Magnetic force microscope observation also demonstrates that the magnetic domain structures of the Fe dots significantly change with the application of voltage at room temperature through the coupling between piezoelectric and magnetostrictive effects, indicating that the Fe dots/BaTiO(3) hybrid structure provides a promising basis for controlling micromagnetic domain structures using electric voltage.

    DOI: 10.1063/1.2711280

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  136. Ferromagnetism at the surface of a LaCoO3 single crystal observed using scanning SQUID microscopy Reviewed International journal

    A. Harada, T. Taniyama, Y. Takeuchi, T. Sato, T. Kyomen, M. Itoh

    PHYSICAL REVIEW B   Vol. 75 ( 18 ) page: 184426/1 - 5   2007.5

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    Evidence for ferromagnetism at the surface of a LaCoO3 single crystal is reported using a scanning superconducting quantum interference device (SQUID) microscope. Stray magnetic flux detected with the scanning SQUID shows typical ferromagnetic behavior in LaCoO3 below T-c similar to 85 K, in agreement with previous work on LaCoO3 particles. Analysis of the magnetization of LaCoO3 particle samples clearly shows that the magnetization is inversely proportional to the particle radius, giving the information that the ferromagnetism is restricted within a few unit cell layers from the surface. X-ray photoemission spectroscopy also indicates that the ferromagnetism likely originates from the metallic surface due to hole doping with oxygen chemisorption.

    DOI: 10.1103/PhysRevB.75.184426

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  137. Size and field effect on mesoscopic spin glass Reviewed International journal

    K. Komatsu, H. Maki, T. Taniyama, T. Sato

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 310 ( 2 ) page: 1500 - 1502   2007.3

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    Spin glass particles were prepared as the mesoscopic system in order to examine the space scale of spin glass domain (droplet). The peak temperature T-peak in the temperature-dependent magnetization is systematically reduced with decreasing average particle size. This is due to the imitation of droplet growth to the particle diameter. The magnetic field H also decreases T-peak, which is caused by the reduction of the barrier height by Zeeman energy. However, there appears different tendency in the relation between H and T-peak below 100 Oe. This indicates the existence of crossover between the two regimes in which the free energy and Zeeman energy govern the droplet excitation. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.640

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  138. Two magnetic phase transitions in quasi-one-dimensional system SrCo2V2O8 Reviewed International journal

    Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh, Jun-Ichi Yamaura, Yutaka Ueda

    SOLID STATE COMMUNICATIONS   Vol. 141 ( 12 ) page: 667 - 670   2007.3

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    Magnetic properties of SrCo2V2O8 single crystal are investigated by means of ac magnetic susceptibility, dc magnetization and heat capacity measurements. The results show that SrCo2V2O8 possesses two canted antiferromagnetic transitions at similar to 5 and similar to 3 K, which is different from isostructural BaCo2V2O8 with only one anti ferromagnetic transition at similar to 5 K. We suggest that such different magnetic properties are mainly due to their different structural symmetry. (C) 2007 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ssc.2007.01.010

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  139. Surface ferromagnetism of LaCoO3 crystals Reviewed International journal

    A. Harada, T. Taniyama, M. Itoh

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 310 ( 2 ) page: 2172 - 2173   2007.3

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    Linear and nonlinear magnetic susceptibilities of a LaCoO3 particle sample were measured to shed light on the surface ferromagnetism of LaCoO3. The ferromagnetic transition temperature T-C estimated from the nonlinear magnetic susceptibility agrees well with that inferred from Kouvel-Fisher's analysis of the linear susceptibility, while the critical exponent gamma deduced simultaneously from the same analysis is incompatible with any values reported for 2d and 3d ferromagnetism. The results are discussed in view of surface and/or size effects in detail. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.11.117

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  140. Spin-glass behavior in zero magnetic field using tunnel resistance Reviewed International journal

    Y. Takeuchi, K. Komatsu, H. Maki, T. Taniyama, T. Sato

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 310 ( 2 ) page: 1503 - 1505   2007.3

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    The measurement of spin glass in zero magnetic field is essential to investigate the intrinsic nature of spin glass. We pay attention to tunnel resistance between spin-glass layers. The temperature dependence of tunnel resistance between spin-glass layers with the structure of AgMn/Al2O3/AgMn was measured, and was compared with that of Al/Al2O3/AgMn. For the junction of AgMn/Al2O3/AgMn, tunnel resistance shows a peak around the spin-glass transition temperature, but no peak was observed for the junction of Al/Al2O3/AgMn. The results indicate that the magnetic correlation between spin-glass layers is reflected to tunnel resistance. The singularity of the tunnel resistance between spin-glass layers is discussed by the droplet theory. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.10.1099

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  141. Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads Reviewed International journal

    K. Hamaya, S. Masubuchi, M. Kawamura, T. Machida, M. Jung, K. Shibata, K. Hirakawa, T. Taniyama, S. Ishida, Y. Arakawa

    APPLIED PHYSICS LETTERS   Vol. 90 ( 5 ) page: 053108   2007.1

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    The authors have fabricated a lateral double barrier magnetic tunnel junction (MTJ) which consists of a single self-assembled InAs quantum dot (QD) with ferromagnetic Co leads. The MTJ shows clear hysteretic tunnel magnetoresistance (TMR) effect, which is evidence for spin transport through a single semiconductor QD. The TMR ratio and the curve shapes are varied by changing the gate voltage.

    DOI: 10.1063/1.2435957

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  142. Conductive Boundary Layer in CaCu3Ti4O12 with Giant-Dielectric-Response Reviewed International journal

    Desheng Fu, Yosuke Arima, Hiroki Taniguchi, Tomoyasu Taniyama, Mitsuru Itoh, Jianding Yu, Shin-Ya Koshihara

    FERROELECTRICS   Vol. 347 ( 1 ) page: 140 - 144   2007

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    Dense polycrystalline samples of CaCu3Ti4O12 (CCTO) were prepared by solid-state reaction method under a high hydraulic pressure of 700 MPa, and characterized by X-ray diffraction, scanning electron microscopy and atomic force microscopy (AFM). Probing of the conduction path in nanoscale by AFM reveals that the grain boundary layer is conductive in CCTO. Therefore, reported giant-dielectric response in CCTOcan not be understood by the model of conducting grains surrounded by insulating grain boundaries, which is usually used for the explanation of conventional internal barrier layer capacitors.

    DOI: 10.1080/00150190601187500

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  143. Long-range antiferromagnetic ordering in Cu2NiB2O6 Reviewed International journal

    Zhangzhen He, Toru Kyomen, Tomoyasu Taniyama, Mitsuru Itoh

    JOURNAL OF SOLID STATE CHEMISTRY   Vol. 179 ( 12 ) page: 3937 - 3941   2006.12

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    Magnetic properties of peculiar structural-type borate Cu2NiB2O6 are investigated by means of ac susceptibility, dc magnetization, and heat capacity measurements. This material is isostructural to Cu2CoB2O6, of which the structural configuration is composed of quasi-one-dimensional six-columns ribbons. Our experimental results show that this material displays an antiferromagnetic phase transition at similar to 15 K. which differs from Cu2CoB2O6 showing spin-glass behavior below 5 K. The different magnetic ground states in these compounds may be attributed mainly to the subtle balance of the exchange energy in the scalene triangles. (c) 2006 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.jssc.2006.08.034

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  144. Magnetic behavior and structural feature of quasi-one-dimensional BaCu(2)V2O(8) crystal Reviewed International journal

    Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 306 ( 2 ) page: 277 - 280   2006.11

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    Magnetic properties of BaCu2V2O8 single crystals obtained by the spontaneous nucleation method using V2O5 as a self-flux are investigated. Singlet ground states with spin gaps of 215 and 223 K are observed along the directions parallel and perpendicular to the c-axis of the crystal, respectively, being in good agreement with powder sample measurements. Reinvestigation of the crystal structure reveals that the whole structural framework of BaCu2V2O8 crystal can be described as an assembly of alternating chains, which are built by edge-sharing pairs of CuO4 square-plaquettes and VO4 tetrahedra along the c-axis. The magnetic nature of BaCu2V2O8 is well understood based on this structural interpretation. (C) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2006.03.041

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  145. Crystal growth and magnetic properties of SrCO2V2O8 Reviewed International journal

    Zhangzhen He, Tomoyasu Taniyama, Mitsuru Itoh

    JOURNAL OF CRYSTAL GROWTH   Vol. 293 ( 2 ) page: 458 - 461   2006.8

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    We report on the growth condition and magnetic properties of SrCo2V2O8 crystal. High-quality single crystals with dimensions 3x3x6 mm(3) have been successfully grown from its stoichiometrical melt in air by spontaneous nucleation method. Preliminary magnetic measurements show large canted ferromagnetism and unusual paramagnetic anisotropy of the grown crystals. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jcrysgro.2006.05.039

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  146. Magnetic anisotropy switching in (Ga,Mn)As with increasing hole concentration Reviewed International journal

    K. Hamaya, T. Watanabe, T. Taniyama, A. Oiwa, Y. Kitamoto, Y. Yamazaki

    PHYSICAL REVIEW B   Vol. 74 ( 4 ) page: 045201/1 - 4   2006.7

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    We study a possible mechanism of the switching of the magnetic easy axis as a function of hole concentration in (Ga,Mn)As epilayers. In-plane uniaxial magnetic anisotropy along [110] is found to exceed intrinsic cubic magnetocrystalline anisotropy above a hole concentration of p=1.5x10(21) cm(-3) at 4 K. This anisotropy switching can be realized by postgrowth annealing, and the temperature-dependent ac susceptibility is significantly changed with increasing annealing time. On the basis of our recent scenario [Phys. Rev. Lett. 94, 147203 (2005) and Phys. Rev. B 73, 155204 (2006)], we deduce that the growth of highly hole-concentrated cluster regions with [110] uniaxial anisotropy is likely the predominant cause of the enhancement in [110] uniaxial anisotropy at the high hole concentration regime. We can clearly rule out anisotropic lattice strain as a possible origin of the switching of the magnetic anisotropy.

    DOI: 10.1103/PhysRevB.74.045201

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  147. Effect of the shape anisotropy on the magnetic configuration of (Ga,Mn)As and its evolution with temperature Reviewed International journal

    K Hamaya, T Taniyama, T Koike, Y Yamazaki

    JOURNAL OF APPLIED PHYSICS   Vol. 99 ( 12 ) page: 123901/1 - 3   2006.6

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    We study the effect of the shape anisotropy on the magnetic domain configurations of a ferromagnetic semiconductor (Ga,Mn)As/GaAs(001) epitaxial wire as a function of temperature. Using magnetoresistance measurements, we deduce the magnetic configurations and estimate the relative strength of the shape anisotropy compared with the intrinsic anisotropies. Since the intrinsic anisotropy is found to show a stronger temperature dependence than the shape anisotropy, the effect of the shape anisotropy on the magnetic domain configuration is relatively enhanced with increasing temperature. This information about the shape anisotropy provides a practical means of designing nanostructured spin electronic devices using (Ga,Mn)As. (c) 2006 American Institute of Physics.

    DOI: 10.1063/1.2196113

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  148. Antiferromagnetic-paramagnetic transitions in longitudinal and transverse magnetic fields in a SrCo2V2O8 crystal Reviewed International journal

    ZZ He, T Taniyama, M Itoh

    PHYSICAL REVIEW B   Vol. 73 ( 21 ) page: 212406/1 - 4   2006.6

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    Magnetic and heat capacity studies of the 1D anisotropic antiferromagnet SrCo2V2O8 demonstrate field-induced magnetic transitions in longitudinal and transverse magnetic fields. An antiferromagnetic (AF)-paramagnetic (PM) transition is observed instead of spin-flop transition in longitudinal magnetic field parallel to the magnetic easy c-axis. The temperature-field (T-H) phase diagram clearly shows that the AF-PM transition occurs in the same framework for both longitudinal and transverse magnetic fields in SrCo2V2O8. This is an experimental observation of such magnetic behaviors in an anisotropic antiferromagnet, irrespective of the field directions.

    DOI: 10.1103/PhysRevB.73.212406

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  149. Out-of-plane magnetization reversal processes of (Ga,Mn)As with two different hole concentrations Reviewed International journal

    K.Hamaya, T. Taniyama, Y. Yamazaki

    J. Appl. Phys.   Vol. 99 ( 9 ) page: 093903/1 - 5   2006.5

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    DOI: 10.1063/1.2194121

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  150. Analysis of atomic arrangement in magnetic Fe-Pt nanoparticles Reviewed International journal

    H Sakuma, T Taniyama, K Ishii, Y Kitamoto, Y Yamazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 300 ( 2 ) page: 284 - 292   2006.5

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    The order parameter S of Fe-Pt nanoparticles is estimated from X-ray diffraction (XRD) patterns. The total intensity of a diffraction peak is obtained by Rietveld analysis as well as simply integrating the intensity. The Rietveld analysis is found to provide a plausible value of S even for a sample showing an XRD pattern with broad and overlapped peaks. Another order parameter Q, which is obtained from Mossbauer spectra, is introduced, and it is confirmed that Q is equivalent to the probability of Fe atoms being in the L1(0)-type atomic arrangement. The coercivity of Fe-Pt nanoparticles is directly proportional to Q, while it vanishes at S = 0.4, indicating that the magnetic property of Fe-Pt nanoparticles has a closer relationship to Q than S. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2005.05.016

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  151. Electronic properties of the metallic pyrochlore ruthenates Pb2Ru2O6.5 and Bi2Ru2O7 Reviewed International journal

    Makoto Tachibana, Yoshimitsu Kohama, Tomotaka Shimoyama, Akihiro Harada, Tomoyasu Taniyama, Mitsuru Itoh, Hitoshi Kawaji, Tooru Atake

    PHYSICAL REVIEW B   Vol. 73 ( 19 ) page: 193107/1 - 4   2006.5

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    We report the temperature dependence of the resistivity, magnetic susceptibility, and heat capacity of single crystalline Pb2Ru2O6.5 and Bi2Ru2O7, the metallic members of the pyrochlore ruthenates. The analysis of the T-2 coefficient of the resistivity, Pauli paramagnetic susceptibility, and linear heat-capacity coefficient indicates that Pb2Ru2O6.5 is a well-defined Fermi liquid with strong electron correlation. For Bi2Ru2O7, thermodynamic data suggest moderately correlated behavior, while the resistivity shows unusual behavior that can be attributed to the structural disorder in this compound. A comparison with the insulating pyrochlore ruthenates underlines the critical role of easily polarizable Pb/Bi ions in inducing the metallic properties and structural modifications observed in these compounds.

    DOI: 10.1103/PhysRevB.73.193107

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    Other Link: http://orcid.org/0000-0003-3683-5416

  152. Optically pumped spin-polarized carrier transport across Fe wire/GaAs interfaces Reviewed International journal

    T Taniyama, E Wada, Y Yamazaki

    JOURNAL OF APPLIED PHYSICS   Vol. 99 ( 8 ) page: 08T307/1 - 3   2006.4

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    Spin-selective transport of optically pumped spin-polarized electrons across 5-nm-thick Fe wires/GaAs and 5-nm-thick Fe wires/AlOx(1.5 nm)/GaAs interfaces is studied as functions of magnetic field and temperature. We find characteristic temperature dependence of the spin selectivity at the Fe/AlOx/p-GaAs interface, where the selectivity shows a maximum at 200 K, which we attribute to the tunneling effect of spin-polarized electrons across the AlOx layer in the Fe/AlOx/p-GaAs structure. (C) 2006 American Institute of Physics.

    DOI: 10.1063/1.2167071

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  153. Growth behavior and surface feature of quasi-one-dimensional anisotropic antiferromagnet BaCo2V2O8 crystal International journal

    ZZ He, T Taniyama, M Itoh

    JOURNAL OF CRYSTAL GROWTH   Vol. 289 ( 2 ) page: 734 - 736   2006.4

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    We report on the growth behavior and surface feature of quasi-one-dimensional anisotropic antiferromagnet BaCo2V2O8 crystal grown from its stoichiometrical melt in air by spontaneous nucleation method. The grown crystals are found to have a characteristic morphology with clear facets, growth lines and veins. Clear steps on the crystal surface show layer-by-layer growth process from a nucleus at the center. Also large defect (vacancies) are clearly seen on the step edges. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jerysgro.2005.11.113

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  154. Dynamic relaxation of magnetic clusters in a ferromagnetic (Ga,Mn)As epilayer Reviewed International journal

    K Hamaya, T Koike, T Taniyama, T Fujii, Y Kitamoto, Y Yamazaki

    PHYSICAL REVIEW B   Vol. 73 ( 15 ) page: 155204/1 - 7   2006.4

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    A scenario of the mechanism of intriguing ferromagnetic properties in Mn-doped magnetic semiconductor (Ga,Mn)As is examined in detail. We find that magnetic features seen in zero-field-cooled and field-cooled magnetizations are not interpreted with a single domain model [Phys. Rev. Lett. 95, 217204 (2005)], and the magnetic relaxation, which is similar to that seen in magnetic particles and granular systems, is becoming significant at temperatures above the lower-temperature peak in the temperature dependence of ac susceptibility, supporting the cluster/matrix model reported in our previous work [Phys. Rev. Lett. 94, 147203 (2005)]. Cole-Cole analysis reveals that magnetic interactions between such (Ga,Mn)As clusters are significant at temperatures below the higher-temperature peak in the temperature dependent ac susceptibility. The magnetizations of these films disappear above the temperature showing the higher-temperature peak, which is generally referred to as the Curie temperature. However, we suggest that these combined results are evidence that the temperature is actually the blocking temperature of (Ga,Mn)As clusters with a relatively high hole concentration compared to the (Ga,Mn)As matrix.

    DOI: 10.1103/PhysRevB.73.155204

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  155. Large magnetic anisotropy in the quasi-one-dimensional system BaCo2V2O8 Reviewed International journal

    Z He, T Taniyama, M Itoh

    APPLIED PHYSICS LETTERS   Vol. 88 ( 13 ) page: 132504/1 - 3   2006.3

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    Magnetic anisotropy in the one-dimensional spin chain system BaCo2V2O8 is investigated using magnetic susceptibility, magnetization, and heat capacity measurements. Unusual magnetic anisotropy is observed in the paramagnetic state at room temperature. The magnetic anisotropy energy of BaCo2V2O8 is estimated to be greater than 1.44(4)x10(7) erg/cm(3) at 2 K using a simple uniaxial two-sublattice mean-field model. (c) 2006 American Institute of Physics.

    DOI: 10.1063/1.2189913

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  156. High field magnetism of the quasi one-dimensional anisotropic antiferromagnet BaCO2V2O8 Reviewed

    Kimura S., Yashiro H., Hagiwara M., Okunishi K., Kindo K., He Z., Taniyama T., Itoh M.

    YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS   Vol. 51   page: 99-+   2006

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    DOI: 10.1088/1/1742-6596/51/1/021

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  157. Optical studies of electron spin transmission Reviewed

    Bland J.

    Ultrathin Magnetic Structures IV: Applications of Nanomagnetism     page: 59-100   2005.12

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    DOI: 10.1007/3-540-27164-3_4

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  158. Field-induced order-disorder transition in the quasi-one-dimensional anisotropic antiferromagnet BaCo2V2O8 Reviewed International journal

    Zhangzhen He, Tomoyasu Taniyama, Tôru Kyômen, Mitsuru Itoh

    Physical Review B - Condensed Matter and Materials Physics   Vol. 72 ( 17 ) page: 172403/1 - 4   2005.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER PHYSICAL SOC  

    Order-disorder transition is observed in the quasi-one-dimensional anisotropic spin chain antiferromagnet BaCo2V2O8 in magnetic fields along the magnetic easy c axis below the Néel temperature. We construct the phase diagram in the H-T plane through magnetic and heat capacity measurements and find that the phase boundary of the order-disorder transition can be described in terms of a mean-field power law. We also suggest that quantum critical behavior from three-dimensional Néel ordering back into a one-dimensional disordered phase is observed in magnetic fields above a critical value of 4.4T. © 2005 The American Physical Society.

    DOI: 10.1103/PhysRevB.72.172403

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  159. Magnetotransport measurement of (Ga,Mn)As epilayers with low-temperature annealing Reviewed International journal

    H Kato, K Hamaya, Y Kitamoto, Taniyama, I, H Munekata

    ELECTROCHIMICA ACTA   Vol. 51 ( 5 ) page: 1004 - 1007   2005.11

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    Magnetotransport features of a ferromagnetic semiconductor (Ga,Mn)As epilayer are found to change by annealing at 250 degrees C. Magnetoresistance curves of the annealed sample indicate that the change in the magnetic easy axis in the film plane as well as the change in the magnetization reversal processes are induced by the enhancement in the contribution of [110] uniaxial anisotropy. The origin of the enhancement in [110] uniaxial anisotropy is also discussed. (C) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.electacta.2005.04.059

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  160. Correlation between ferromagnetism and hole localization in very thin (Ga,Mn)As epilayers Reviewed International journal

    K Hamaya, Y Kitamoto, Y Yamazaki, T Taniyama, R Moriya, H Munekata

    JOURNAL OF APPLIED PHYSICS   Vol. 97 ( 10 ) page: 10D301/1 - 3   2005.5

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    The magnetic and magnetotransport properties of very thin as-grown (Ga,Mn)As epilayers are reported. A 10-nm-thick epilayer shows a marked decrease in the Curie temperature and conductivity. The magnetoresistance (MR) increases with decreasing temperature in the temperature range below 20 K and the MR hysteresis curves show a characteristic feature which is different from that of thicker epilayers. We attribute the characteristic feature to the localization of hole carriers at the surface region of the epilayer. (c) 2005 American Institute of Physics.

    DOI: 10.1063/1.1844731

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  161. Effect of Ga+ irradiation on magnetic and magnetotransport properties in (Ga,Mn)As epilayers Reviewed International journal

    H Kato, K Hamaya, Y Kitamoto, T Taniyama, H Munekata

    JOURNAL OF APPLIED PHYSICS   Vol. 97 ( 10 ) page: 10D302/1 - 3   2005.5

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    We report on the magnetic and magnetotransport properties of ferromagnetic semiconductor (Ga,Mn)As modified by Ga+ ion irradiation using focused ion beam. A marked reduction in the conductivity and the Curie temperature is induced after the irradiation. Furthermore, an enhanced negative magnetoresistance and a change in the magnetization reversal process are also demonstrated at 4 K. Raman-scattering spectra indicate a decrease in the concentration of hole carriers after the irradiation, and a possible origin of the change in the magnetic properties is discussed. (c) 2005 American Institute of Physics.

    DOI: 10.1063/1.1844751

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  162. Mixed magnetic phases in (Ga,Mn)As epilayers Reviewed International journal

    K Hamaya, T Taniyama, Y Kitamoto, T Fujii, Y Yamazaki

    PHYSICAL REVIEW LETTERS   Vol. 94 ( 14 ) page: 147203/1 - 4   2005.4

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    Two different ferromagnetic-paramagnetic transitions are detected in (Ga,Mn)As/GaAs(001) epilayers from ac susceptibility measurements: transition at a higher temperature results from (Ga,Mn)As cluster phases with [110] uniaxial anisotropy and that at a lower temperature is associated with a ferromagnetic (Ga,Mn)As matrix with &lt; 100 &gt; cubic anisotropy. A change in the magnetic easy axis from [100] to [110] with increasing temperature can be explained by the reduced contribution of &lt; 100 &gt; cubic anisotropy to the magnetic properties above the transition temperature of the (Ga,Mn)As matrix.

    DOI: 10.1103/PhysRevLett.94.147203

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    Other Link: http://orcid.org/0000-0003-3683-5416

  163. XMCD study of dilutely Fe doped Pd fine particles Reviewed International journal

    T Shinohara, M Shigemune, T Sato, T Taniyama, H Sakurai

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 74 ( 3 ) page: 1044 - 1048   2005.3

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    X-ray magnetic circular dichroism (XMCD) of Pd97.1Fe2.9 fine particle samples is studied at the Pd L-2.3 edges. The magnetic moment of a Pd atom, which is estimated using the magneto-optical sum rule, is similar to 0.06 mu(B)/atom independent of particle size, while the total magnetization of the particle samples decreases monotonically with decreasing particle size. We attribute the size dependent magnetization to a reduction in the Fe magnetic moment at the surface region with decreasing particle size. Analysis of the XMCD data is reported in detail.

    DOI: 10.1143/JPSJ.74.1044

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  164. Spin selective transport at the ferromagnetic wire/GaAs interface Reviewed International journal

    T Taniyama, K Hamaya, Y Yamazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 286 ( 3 ) page: 103 - 107   2005.2

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    Spin selective electron transport across a submicron Fe wire/GaAs(001) interface is studied under optical spin orientation. A significant bias dependence of the difference between photocurrents for two different single domain structures with opposite magnetic orientations is observed at room temperature, which we attribute to the spin selective transport effect of spin polarized electrons excited in GaAs across the interface. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2004.09.047

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  165. Influence of chemical conditions in fabrication of Bi-YIG precursor on morphological and magneto-optical response of its particulate film Reviewed

    Kuroda CS, Uchida K, Ikazaki F, Taniyama T, Kitamoto Y, Yamazaki Y

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)     page: 425-430   2005

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  166. Ion irradiation control of ferromagnetism in (Ga,Mn)As Reviewed

    Kato H, Hamaya K, Taniyama T, Kitamoto Y, Munekata H

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   Vol. 44 ( 24-27 ) page: L816-L818   2005

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  167. Effect of annealing on the transport process in manganite thin films Reviewed

    Taniyama T, Hamaya K, Yamazaki Y

    NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)     page: 189-194   2005

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  168. Anode products of a direct ethanol PEM fuel cell in a circulating fuel operation mode Reviewed

    Taneda K, Taniyama T, Yamazaki Y

    ELECTROCHEMISTRY   Vol. 72 ( 10 ) page: 700-702   2004.10

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  169. Low temperature preparation and performance of Ni/YSZ anode with a multi-layered structure for SOFC Reviewed International journal

    T Hatae, N Kakuda, T Taniyama, Y Yamazaki

    JOURNAL OF POWER SOURCES   Vol. 135 ( 1-2 ) page: 25 - 28   2004.9

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    Ni/yttria-stabilized zirconia (YSZ) anodes with a multi-layered structure are prepared on YSZ substrates by a low temperature process using electron-beam evaporation method. The Ni/YSZ anode is obtained by reducing a NiO/YSZ anode, and both Ni and YSZ layers have no impurity phases. Scanning ion microscopy (SIM) observation of the cross-section of the anode shows a well-separated structure without Ni diffusion and agglomeration. Tight adhesion between the Ni and YSZ layers is realized by the low temperature process at 800degreesC. The current-voltage and current-power characteristics for three separate single cell samples with the multi-layered anode are measured. The maximum power densities of the single cells using an YSZ as an electrolyte (0.5 rum thick) with a four-layered anode, a six-layered anode, and a 10-layered anode are obtained to be 0.14, 0.12, and 0.32 W/cm(2) at 800degreesC, respectively. The improvement in the performance of the 10-layered anode compared with the four-layered and six-layered anodes is mainly due to an increase in the length of triple phase boundary in the structure and enhancement in the diffusivity of fuel gas. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jpowsour.2004.03.075

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  170. Proton conductivity of zirconium tricarboxybutylphosphonate/PBI nanocomposite membrane Reviewed International journal

    Y Yamazaki, MY Jang, T Taniyama

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   Vol. 5 ( 4 ) page: 455 - 459   2004.7

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    The preparation process and proton transport properties of zirconium tricarboxybutylphosphonate Zr(O3PC(CH2)(3)(COOH)(3))(2)(Zr(PBTC))/polybenzimidazole (PBI) composite membranes have been investigated with a view to developing a novel electrolyte for direct methanol fuel cells. A compacted Zr(PBTC) powder sample and a Zr(PBTC)/PBI composite membrane with 50 wt.% Zr(PBTC) content show conductivities of 6.74 x 10(-2) S cm(-1) and 3.82 x 10(-3) S cm(-1) at 200 degreesC under a fully humid condition, respectively. Postsulfonation thermal treatment, which has a great effect on the ligand structure of PBI, gives a marked increase in the conductivity of the membrane by a factor of 2 in the same condition. This effect is mainly attributed to the proton transport via sulfonic acid groups bonded to the PBI unit. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.stam.2004.02.005

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  171. Significant change in in-plane magnetic anisotropy of (Ga,Mn)As epilayer induced by low-temperature annealing Reviewed International journal

    H Kato, K Hamaya, T Taniyama, Y Kitamoto, H Munekata

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   Vol. 43 ( 7A ) page: L904 - L906   2004.7

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    We find significant changes in the in-plane magnetic anisotropy of a (Ga,Mn)As epilayer by low-temperature annealing. Detailed magnetization and transport measurements reveal an enhancement in the contribution of a uniaxial anisotropy along [110] after annealing. The change in the magnetic anisotropy is affected by increasing hole concentration due to the annealing.

    DOI: 10.1143/JJAP.43.L904

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  172. Anistropic magnetotransport due to uniaxial magnetic anisotropy in (Ga,Mn)As wires Reviewed International journal

    K Hamaya, T Taniyama, Y Kitamoto, Y Yamazaki, R Moriya, H Munekata

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 40 ( 4 ) page: 2682 - 2684   2004.7

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    The in-plane anisotropic magnetotransport feature of 2-mum-wide (Ga,Mn)As wires is examined at 4 K. The magnetoresistance (MR) features as a function of applied field orientation show clear anisotropy associated with the cubic magnetocrystalline anisotropy. Moreover, the field orientation dependence of the magnetization switching field shows two asymmetric peaks along [110] and [(1) over bar 10], indicating the presence of uniaxial anisotropy along [110]. A simple model incorporating the cubic and uniaxial anisotropies well explains these asymmetric peaks based on magnetization reversal processes via 90degrees domain wall displacement.

    DOI: 10.1109/TMAG.2004.832667

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  173. Anisotropy field distribution of partially ordered FePt nanoparticles Reviewed International journal

    H Sakuma, T Taniyama, Y Kitamoto, Y Yamazaki, H Nishio, H Yamamoto

    JOURNAL OF APPLIED PHYSICS   Vol. 95 ( 11 ) page: 7261 - 7263   2004.6

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    The anisotropy field distribution of various Fe-Pt nanoparticle samples with a partially ordered structure is investigated up to 90 kOe using the Flanders and Shtrikman's method. The distribution of the Fe-Pt samples with a low order parameter of 0.66 or a nonequiatomic composition of Fe58Pt42 or Fe41Pt59 is broader than that of the Fe-Pt sample with an almost full order parameter of 0.96 at 5 K. The broad distribution is attributed to an inhomogeneous atomic arrangement with L1(0), L1(2), and disordered structures. The distribution measured at 300 K, on the other hand, is quite different from that at 5 K, indicating a significant thermal effect on the magnetization reversal. (C) 2004 American Institute of Physics.

    DOI: 10.1063/1.1669352

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  174. Ferromagnetism of gas-evaporated Pd fine particles in mesoscopic size Reviewed International journal

    Takenao Shinohara, Tetsuya Sato, T. Taniyama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 272   page: E1181 - E1182   2004.5

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    The surface gas adsorption effect on the magnetic properties of Pd fine particles was studied to elucidate the magnetic structure. The O-2 gas exposure decreases the saturation component of magnetization to similar to 8% of that of a particle with clean surface, but the high field susceptibility was slightly increased. This indicates that the ferromagnetism of the Pd. ne particle is very sensitive to the surface condition and the ferromagnetic ordering exists in the surface region of the. ne particle. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.12.391

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  175. Contribution of Shape Anisotropy to the Magnetic Configuration of (Ga, Mn)As Reviewed

    Hamaya K.

    Japanese Journal of Applied Physics, Part 2: Letters   Vol. 43 ( 2 B ) page: .   2004.2

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  176. Magnetotransport study of temperature dependent magnetic anisotropy in a (Ga,Mn)As epilayer Reviewed International journal

    K Hamaya, T Taniyama, Y Kitamoto, R Moriya, H Munekata

    JOURNAL OF APPLIED PHYSICS   Vol. 94 ( 12 ) page: 7657 - 7661   2003.12

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    The anisotropic magnetotransport properties of a (Ga,Mn)As epilayer and the magnetization switching are studied as a function of temperature. The magnetization switching field shows asymmetry for crystallographically equivalent [110] and [(1) over bar 10] directions at 4 K, and the asymmetry is more significant at 40 K. The magnetization switching features clearly show that cubic magnetocrystalline anisotropy along &lt;100&gt;, which is biased by a small uniaxial anisotropy along the [110] easy axis, is dominant at 4 K. On the other hand, the [110] uniaxial anisotropy competes with the cubic anisotropy and dominates the magnetization switching at 40 K. Accordingly, the magnetization reversal in the (Ga,Mn)As epilayer occurs via 90degrees and 180degrees domain-wall displacement at 4 and 40 K, respectively. A mechanism of the change in the magnetic anisotropy is discussed within a theoretical description of the hole band structure. (C) 2003 American Institute of Physics.

    DOI: 10.1063/1.1629134

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  177. Surface ferromagnetism of Pd fine particles Reviewed International journal

    T Shinohara, T Sato, T Taniyama

    PHYSICAL REVIEW LETTERS   Vol. 91 ( 19 ) page: 197201/1 - 4   2003.11

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    We report clear evidence of the ferromagnetism of gas-evaporated Pd fine particles with a clean surface. The clean Pd particle is found to have a magnetic heterostructure: the surface of the particle is ferromagnetic and the rest is paramagnetic. The size dependence of the magnetic saturation component reveals that the ferromagnetic ordering occurs only on (100) facets of the particle and that the topmost two to five layers from the surface contribute to the ferromagnetism with a magnetic moment of (0.75+/-0.31)mu(B)/atom.

    DOI: 10.1103/PhysRevLett.91.197201

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  178. Spin selective transport at the ferromagnet/semiconductor interface Reviewed International journal

    JAC Bland, T Taniyama, WS Cho, SJ Steinmueller

    CURRENT APPLIED PHYSICS   Vol. 3 ( 5 ) page: 429 - 432   2003.10

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    Recent advances in spin-polarized electron transport at the ferromagnet/semiconductor interface are summarized in the context of potential applications to spin-electronics. We review evidence for spin injection from a ferromagnetic metal into a semiconductor based on recent studies of polarized luminescence in ferromagnet/quantum well light emitting diode structures. Our recent results on spin-polarized electron transport from GaAs into Fe under optical spin pumping are shown. These observations clearly indicate an importance of the introduction of a tunneling barrier between the ferromagnetic metal and semiconductor in order to achieve a high spin injection and detection efficiency. (C) 2003 Published by Elsevier B.V.

    DOI: 10.1016/S1567-1739(03)00106-8

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  179. Spin-selective transport through Fe/AlOx/GaAs(100) interfaces under optical spin orientation Reviewed International journal

    T Taniyama, G Wastlbauer, A Ionescu, M Tselepi, JAC Bland

    PHYSICAL REVIEW B   Vol. 68 ( 13 ) page: 134430/1 - 4   2003.10

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    Spin-selective transport of optically excited polarized electrons through Fe/GaAs(100) and Fe/AlOx/GaAs(100) interfaces is reported. A visible enhancement in the spin selectivity is observed in the Fe/AlOx/GaAs(100) structure at a forward bias of 0.04 V, while no such feature is seen in the Fe/GaAs(100) structure. The spin selectivity in the Fe/AlOx/GaAs(100) structure has a maximum value which is a factor of 2 larger than that of the Fe/GaAs(100) structure at the same bias of 0.04 V. The effect can be understood in terms of the spin dependent tunneling of electrons through the oxide barrier in the Fe/AlOx/GaAs(100) structure, while its clear bias dependence excludes magnetic circular dichroism as a possible mechanism.

    DOI: 10.1103/PhysRevB.68.134430

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  180. Control of magnetic anisotropy and magnetotransport in epitaxial micropatterned (Ga,Mn)As wire structures Reviewed International journal

    K Hamaya, R Moriya, A Oiwa, T Taniyama, Y Kitamoto, H Munekata

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 39 ( 5 ) page: 2785 - 2787   2003.9

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    The authors present magnetoresistance characteristics of patterned (Ga,Mn)As wire structures, which depend on wire width and thus overall magnetic anisotropy. Cubic and uniaxial magnetocrystalline anisotropies seem to be the, dominant magnetic contributions in 2-mum-wide wires, whereas both magnetocrystalline and shape-induced anisotropies, contribute to magnetization reversal in 1mum-wide wires, as manifested by jumps in the magnetoresistance curves. The role of these two anisotropies in the magnetization reversal is discussed, together with the determination of magnetic easy/hard axes of (Ga,Mn)As wires.

    DOI: 10.1109/TMAG.2003.815710

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  181. Anomalous hall resistivity due to grain boundary in manganite thin films Reviewed International journal

    T. Taniyama, K. Hamaya, Y. Kitamoto, Y. Yamazaki

    Journal of Applied Physics   Vol. 93 ( 10 ) page: 8107 - 8109   2003.5

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    The anomalous Hall resistivities of polycrystalline manganite thin films with different grain sizes were analyzed. Positive anomalous Hall coefficients due to grain boundaries were observed in addition to a negative contribution in the bulk manganite. The temperature dependence of the anomalous Hall resistivity was found to be in agreement with its magnetoresistive feature.

    DOI: 10.1063/1.1543865

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  182. Cation order and magnetic properties of double perovskite Sr2FeMoO6 Reviewed International journal

    H Sakuma, T Taniyama, Y Kitamoto, Y Yamazaki

    JOURNAL OF APPLIED PHYSICS   Vol. 93 ( 5 ) page: 2816 - 2819   2003.3

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    A double perovskite. type compound Sr2FeMoO6 was synthesized by a solid-state reaction. The order parameter (x) of Fe and Pt ions on the B sites increased from 68% to 82% and the spontaneous magnetization at 5 K increased from 2.1 to 3.0 mu(B) per formula unit by lowering the calcination temperature from 1100 to 500degreesC. The dependence of the spontaneous magnetization on x was discussed using two models considering the local magnetic interactions between ions on the B sites. Fe-57 Mossbauer analysis suggested the existence of tiny areas of SrFeO3-delta in Sr2FeMoO6. (C) 2003 American Institute of Physics.

    DOI: 10.1063/1.1544088

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  183. Asymmetric transport due to spin injection into a Kondo alloy Reviewed International journal

    T Taniyama, N Fujiwara, Y Kitamoto, Y Yamazaki

    PHYSICAL REVIEW LETTERS   Vol. 90 ( 1 ) page: 016601/1 - 4   2003.1

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    Spin injection is found to have a significant effect on the transport properties of the Kondo alloy Cu(Fe). When a spin-polarized electron current flows from Co into Cu(Fe) wires through the Co/Cu(Fe) interface, the resistivity of the Cu(Fe) wire is suppressed near the interface, as distinct from the ordinary logarithmic increase in the resistivity at low temperatures. For the opposite current direction, no significant changes are observed. The asymmetry of the resistivity with respect to the current direction decays with a characteristic length of 1.5+/-0.4 mum at 2.5 K as the distance from the interface is increased. Possible mechanisms for the asymmetry are discussed.

    DOI: 10.1103/PhysRevLett.90.016601

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  184. Optical studies of spin injection and detection at ferromagnet/semiconductor interfaces International journal

    J.A.C. Bland, S.J. Steinmuller, A. Hirohata, W.S. Cho, Y.B. Xu, C.M. Guertler, G. Wastlbauer, A. Inonescu, T. Taniyama, T. Trypiniotis

    Europhys. News   Vol. 34 ( 6 ) page: 240   2003

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  185. FePt nanoparticle-assembly for magnetic recording media Reviewed

    Kitamoto Y, Sakuma H, Jogo A, Taniyama T, Yamazaki Y, Nishio H, Yamamoto H

    MAGNETIC MATERIALS, PROCESSES, AND DEVICES VII AND ELECTRODEPOSITION OF ALLOYS, PROCEEDINGS   Vol. 2002 ( 27 ) page: 483-490   2003

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  186. Crossover of magnetotransport process toward spin-polarized tunneling in manganite thin films Reviewed International journal

    T Taniyama, M Yamasaki, Y Yamazaki

    APPLIED PHYSICS LETTERS   Vol. 81 ( 24 ) page: 4562 - 4564   2002.12

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    We report on the magnetoresistive features of well-characterized polycrystalline manganite thin films as a function of film thickness. A crossover of the magnetization process from domain wall displacement to magnetic rotation of each grain is observed around a thickness of 25 nm, accompanied with the maximum of the coercivity. The thickness dependence of the electrical resistivity clearly distinguishes the transport mechanism at 25 nm, below which the magnetoresistance can be well scaled by similar to(M/M-S)(2), using the magnetization M and the saturation magnetization M-S. Spin-polarized tunneling transport between adjacent grains provides a comprehensive picture for the magnetotransport data. (C) 2002 American Institute of Physics.

    DOI: 10.1063/1.1528282

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  187. Surface magnetism of Pd-Fe fine particles Reviewed International journal

    T Shinohara, M Shigemune, T Sato, T Taniyama

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 38 ( 5 ) page: 2634 - 2636   2002.9

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    Magnetization and ac susceptibility measurements of Pd98.0Fe2.0 fine particles (average radii of 7.6-20.4 nm) gave the evidence of magnetic ordering of the surface layer in fine particle. The magnetic transition temperature of the surface layer in Pd-Fe fine particles was determined to be about 40 K based on the peaks in nonlinear susceptibility, and it slightly decreased with decreasing the particles size. Moreover, the size dependence of saturation magnetization indicates that the surface layer has no saturation magnetization at low temperature.

    DOI: 10.1109/TMAG.2002.801968

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  188. Change in resistance of CuFe wires induced by spin injection Reviewed International journal

    T. Taniyama, N. Fujiwara, Y. Kitamoto, Y. Yamazaki

    IEEE Transactions on Magnetics   Vol. 38 ( 5 I ) page: 2872 - 2874   2002.9

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    Spin injection from a ferromagnetic metal Co into a Kondo alloy CuFe is demonstrated using the devices with a Co/CuFe wire junction. The temperature dependent resistivity of CuFe shows an increase below 20 K as spin current flows from CuFe into Co as seen in Kondo alloys. In contrast, the resistivity for the opposite current direction from Co into CnFe decreases at low temperatures at a current of 250 μA. The difference between the resistivities of both the current directions logarithmically increases with decreasing temperature, indicating the suppression of the spin scattering at Fe impurities that causes the logarithmic increase in Kondo alloys.

    DOI: 10.1109/TMAG.2002.803135

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  189. Magneto-optical properties and morphology of particulate film consisting of Bi-YIG coprecipitated particles Reviewed

    Kuroda CS, Taniyama T, Kitamoto Y, Yamazaki Y

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 241 ( 2-3 ) page: 201-206   2002.3

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  190. Strain-induced anisotropic low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

    Choi KK, Taniyama T, Yamazaki Y

    JOURNAL OF APPLIED PHYSICS   Vol. 90 ( 12 ) page: 6145-6150   2001.12

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  191. Selective dry etching of manganite thin films for high sensitive magnetoresistive sensors Reviewed

    Naoe M, Hamaya K, Fujiwara N, Taniyama T, Kitamoto Y, Yamazaki Y

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 235 ( 1-3 ) page: 223-226   2001.10

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  192. Improvement in magneto-optical properties of Bi-YIG particulate films by reduction in particle size Reviewed

    Kuroda CS, Taniyama T, Kitamoto Y, Yamazaki Y, Hirano T

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 37 ( 4 ) page: 2432-2434   2001.7

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  193. Magnetotransport and Mossbauer study of Fe3O4/gamma Fe2O3 granular thin films Reviewed

    Taniyama T, Kitamoto Y, Yamazaki Y

    JOURNAL OF APPLIED PHYSICS   Vol. 89 ( 11 ) page: 7693-7695   2001.6

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  194. Magnetoresistance of manganite thin films induced by reaction with substrate Reviewed

    Hamaya K, Taniyama T, Yamazaki Y

    JOURNAL OF APPLIED PHYSICS   Vol. 89 ( 11 ) page: 6320-6323   2001.6

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  195. X-ray magnetic circular dichroism of PdFe fine particles at Pd L-2,L-3 edges Reviewed

    Shinohara T, Sato T, Taniyama T, Sakurai H

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 226   page: 1939-1941   2001.5

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  196. Magnetotransport and spin con-figurations in patterned ferromagnetic wires Reviewed

    Taniyama T, Nakatani L, Yakabe T, Nomura A, Shiiki K, Yamazaki Y

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 226   page: 1850-1852   2001.5

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  197. Iron mixed-valence compounds, BaSm(Cu0.5+xFe0.5-x)(2)O5+delta II: The Fe2.5+ state and magnetic properties Reviewed

    Linden J, Nakamura J, Pietari T, Taniyama T, Karppinen M, Yamauchi H

    PHYSICA C   Vol. 338 ( 1-2 ) page: 126-131   2000.8

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  198. Magnetic properties, oxygen content and metal valences in BaRE(Cu0.5Fe0.5)(2)O5+delta with RE = Lu, Yb, Y, Eu, Sm, Nd and Pr Reviewed

    Kochi M, Linden J, Taniyama T, Lehmus K, Karppinen M, Yamauchi H

    PHYSICA C   Vol. 338 ( 1-2 ) page: 132-136   2000.8

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  199. Magnetic and magneto-transport properties of gamma Fe2O3-grain-embedded Fe3O4 thin films Reviewed

    Uotani M, Taniyama T, Yamazaki Y

    JOURNAL OF APPLIED PHYSICS   Vol. 87 ( 9 ) page: 5585-5587   2000.5

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  200. Control of domain structures and magnetotransport properties in patterned ferromagnetic wires Reviewed

    Taniyama T, Nakatani I, Yakabe T, Yamazaki Y

    APPLIED PHYSICS LETTERS   Vol. 76 ( 5 ) page: 613-615   2000.1

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  201. Microstructure and low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

    Choi KK, Taniyama T, Yamazaki Y

    ELECTROCHEMICAL TECHNOLOGY APPLICATIONS IN ELECTRONICS III   Vol. 99 ( 34 ) page: 229-234   2000

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  202. Magnetization process of zigzag shaped Co wires Reviewed

    Taniyama T, Nakatani I, Sato T, Namikawa T, Yamazaki Y

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 35 ( 5 ) page: 3478-3480   1999.9

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  203. Room-temperature and low-field magnetoresistance of La-Sr-Mn-O thin films Reviewed

    Choi KK, Taniyama T, Yamazaki Y

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 35 ( 5 ) page: 2844-2846   1999.9

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  204. Bias dependent intergrain tunneling in lanthanum manganite thin films Reviewed

    Nakano K, Naoe M, Yamasaki M, Choi KK, Taniyama T, Yamazaki Y

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 35 ( 5 ) page: 2859-2861   1999.9

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  205. Size dependent magnetization of PdFe fine particles Reviewed

    Shinohara T, Sato T, Taniyama T, Nakatani I

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 196   page: 94-95   1999.5

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  206. Magnetoresistance of zigzag-shaped cobalt wires Reviewed

    Taniyama T, Nakatani I, Yanagihara H, Kita E

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 196   page: 77-79   1999.5

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  207. Resistivity due to domain walls in Co zigzag wires Reviewed

    Taniyama T, Nakatani I, Namikawa T, Yamazaki Y

    PHYSICAL REVIEW LETTERS   Vol. 82 ( 13 ) page: 2780-2783   1999.3

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  208. Magnetic relaxation in Ga0.6Mo2S4 spinel Reviewed

    Taniyama T, Nakatani I

    JOURNAL OF APPLIED PHYSICS   Vol. 83 ( 11 ) page: 6323-6325   1998.6

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  209. Nonlinear susceptibility of ferromagnetic Ga0.6Mo2S4 spinel Reviewed

    Taniyama T, Nakatani I

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   Vol. 177   page: 263-264   1998.1

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  210. Ferromagnetism of Pd fine particles Reviewed

    Taniyama T, Ohta E, Sato T

    PHYSICA B   Vol. 237   page: 286-288   1997.7

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  211. Observation of 4d ferromagnetism in free-standing Pd fine particles Reviewed

    Taniyama T, Ohta E, Sato T

    EUROPHYSICS LETTERS   Vol. 38 ( 3 ) page: 195-200   1997.4

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  212. Magnetic properties of Pd-2.9 at% Fe fine particles Reviewed

    Taniyama T, Ohta E, Sato T, Takeda M

    PHYSICAL REVIEW B   Vol. 55 ( 2 ) page: 977-982   1997.1

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  213. Magnetism of AuFe nanoparticles Reviewed

    Taniyama T, Ogawa R, Sato T, Ohta E

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   Vol. 217   page: 319-321   1996.10

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  214. INTRAPARTICLE STRUCTURE OF PD FINE PARTICLES Reviewed

    TANIYAMA T, SATO T, OHTA E, TAKEDA M

    PHYSICA B   Vol. 213   page: 254-256   1995.8

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  215. INTRAPARTICLE STRUCTURE IN ULTRA-FINE ZNFE2O4 PARTICLES Reviewed

    YOKOYAMA M, OKU T, TANIYAMA T, SATA T, OHTA E, SATO T, HANEDA K, ITOH S, KURAHASHI K, TAKEDA M

    PHYSICA B   Vol. 213   page: 251-253   1995.8

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Books 3

  1. "Interface-Related Magnetic Phenomena in Novel Heterostructures" in Novel Structured Metallic and Inorganic Materials

    Tomoyasu Taniyama( Role: Joint author)

    Springer  2019.7  ( ISBN:978-981-13-7610-8

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    Language:English Book type:Scholarly book

  2. Ferrites : proceedings of ICF 11 April 15-19, 2013 Okinawa, Japan

    International Conference on Ferrites, 中川 茂樹, 谷山 智康, 松下 伸広, 杉本 諭, 中川 貴( Role: Sole author)

    Japan Society of Powder and Powder Metallurgy  2014 

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  3. Nanoscale physics for materials science

    鶴見 敬章, 平山 博之, Vacha Martin, 谷山 智康( Role: Sole author)

    CRC Press  2010  ( ISBN:9781439800591

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Presentations 1

  1. Development of interfacial multiferroics - A case study of LSMO/PMN-PT heterostructure

    S. P. Pati, T. Taniyama

    2020 MRS Spring Meetin  2020.4.15 

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    Event date: 2020.4

    Language:English   Presentation type:Poster presentation  

Research Project for Joint Research, Competitive Funding, etc. 30

  1. Toward novel multifunctional spintronic devices using hybrid two-dimensional quantum materials

    2019.1 - 2020.3

    Tomoyasu Taniyama

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    Grant type:Competitive

  2. Interfacial multiferroic materials

    2018.10

    CREST 

    Tomoyasu Taniyama

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    Grant type:Competitive

  3. マルチフェロイク界面を利用した革新的発電技術の原理実証

    2018.6 - 2019.7

    加藤科学振興会 研究助成金 

    谷山智康

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    Grant type:Competitive

  4. マルチフェロイク・マグノニクス技術の開発

    2017.4 - 2020.3

    旭硝子財団 継続型グラント(ステップアップ助成) 

    谷山智康

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    Grant type:Competitive

  5. マルチフェロイクスヘテロ界面における磁気抵抗変調効果とスピン偏極制御

    2014.4 - 2015.3

    旭硝子財団 研究助成(奨励研究) 

    谷山智康

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    Grant type:Competitive

  6. Energy Dissipation-Less Spin-Based Devices

    2012.4 - 2013.3

    ASPIRE League Research Grant FY2012 

    谷山智康

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    Grant type:Competitive

  7. 相補的光学アプローチを利用した界面スピン伝導の機構解明

    2011.4 - 2014.3

    東レ科学振興会 科学技術研究助成 

    谷山智康

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    Grant type:Competitive

  8. 時間分解スピンダイナミクスを利用した強磁性金属スピン偏極の定量化プロトコル

    2009.4 - 2010.3

    三菱財団 研究助成 

    谷山智康

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    Grant type:Competitive

  9. 超低電力電圧駆動型スピン偏極・配向化技術の開

    2009.1 - 2012.12

    新エネルギー・産業技術総合開発機構(NEDO)産業技術研究助成(若手研究グラント) 

    谷山智康

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    Grant type:Competitive

  10. 局所電圧印加方式による省電力情報磁気ビット操作技術の開発

    2008.4 - 2009.3

    カシオ科学振興財団 研究助成 

    谷山智康

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    Grant type:Competitive

  11. 磁性酸化物量子ドットの自己組織化形成と超高速・局所的磁気状態制御

    2008.4 - 2009.3

    稲盛財団 研究助成 

    谷山智康

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    Grant type:Competitive

  12. スピン偏極の外的制御とチューナブルスピン源の創製

    2007.10 - 2011.3

    科学技術振興機構戦略的研究推進事業個人型研究(さきがけタイプ) 

    谷山智康

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    Grant type:Competitive

  13. 情報通信用新規スピンデバイスの開発を目指したスピン注入ダイナミクスの研究

    2006.4 - 2007.3

    加藤科学振興会 研究助成金 

    谷山智康

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    Grant type:Competitive

  14. 強磁性金属/半導体ヘテロ構造を用いた精密スピン計測

    2006.4 - 2007.3

    島津財団 研究開発助成金 

    谷山智康

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    Grant type:Competitive

  15. 反応性蒸着法により作製した磁性酸化物/半導体ハイブリッド構造と超高速スピンダイナミクスの研究

    2005.4 - 2006.3

    池谷科学技術振興財団 研究助成 

    谷山智康

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    Grant type:Competitive

  16. 磁性酸化物/半導体界面の原子制御によるスピン検出機能の創出

    2005.4 - 2006.3

    日本板硝子材料工学助成会 研究助成 

    谷山智康

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    Grant type:Competitive

  17. スピン注入による近藤状態の人工的操

    2004.4 - 2006.3

    山田科学振興財団 研究援助 

    谷山智康

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    Grant type:Competitive

  18. 磁性金属細線から非磁性金属細線へのスピン注入の研究

    2004.4 - 2006.3

    旭硝子財団 研究助成(奨励研究) 

    谷山智康

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    Grant type:Competitive

  19. 磁性金属/半導体界面におけるスピン輸

    2003.4 - 2004.3

    神奈川科学技術アカデミー 研究助成 

    谷山智康

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    Grant type:Competitive

  20. 反応性イオンエッチングによる磁性酸化物微細構造の創製

    2000.4 - 2001.3

    日産科学振興財団 学術研究助成 

    谷山智康

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    Grant type:Competitive

  21. 磁性細線におけるナノスケール磁気構造と電気伝導の研究

    2000.4 - 2001.3

    新世代研究所 研究助成 

    谷山智康

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    Grant type:Competitive

  22. 微細加工技術による強磁性磁区構造の制御とその磁気抵抗特性

    1999.4 - 2000.3

    池谷科学技術振興財団 研究助成金 

    谷山智康

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    Grant type:Competitive

  23. 微粒子分散型磁気光学プラスチック光ファイバの開発

    1999.4 - 2000.3

    マッチング・ファンド方式による産学連携研究開発事業 

    山崎陽太郎

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    Grant type:Competitive

  24. 磁性微粒子-エポキシ複合型薄膜の磁気光学特性

    1999.4 - 2000.3

    ホソカワ粉体工学振興財団 研究助成 

    谷山智康

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    Grant type:Competitive

  25. GMR ヘッド特性に与える磁区構造の影響の研究

    1999.4 - 2000.3

    カシオ科学振興財団 研究助成 

    谷山智康

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    Grant type:Competitive

  26. ジグザグ形状強磁性細線における磁区構造観察と電気伝導の研究

    1999.4 - 2000.3

    住友財団 基礎科学研究助成 

    谷山智康

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    Grant type:Competitive

  27. 巨大磁気抵抗薄膜におけるスピン拡散長の測定

    1999.4 - 2000.3

    マツダ財団 研究助成 

    谷山智康

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    Grant type:Competitive

  28. 磁区構造を制御した磁性体微細構造における電気伝導

    1999.4 - 2000.3

    加藤科学振興会 研究奨励金 

    谷山智康

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    Grant type:Competitive

  29. マンガン酸化物における磁気抵抗の低磁場感度向上のための基礎的研究

    1999.4 - 2000.3

    村田学術振興財団 研究助成 

    谷山智康

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    Grant type:Competitive

  30. ランタノイド系分子性金属およびその混晶系の開発とその電子状態

    1994.4 - 1996.3

    日本科学協会 笹川科学助成 

    谷山智康

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    Grant type:Competitive

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KAKENHI (Grants-in-Aid for Scientific Research) 23

  1. 人工トポロジカル構造が誘発するスピンダイナミクスの学理構築と制御技術の開発

    Grant number:21H04614  2021.4 - 2024.3

    日本学術振興会  科学研究費補助金  基盤研究(A)

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    Authorship:Principal investigator  Grant type:Competitive

  2. 低消費電力スピントロニクスを指向した電気駆動型垂直磁化マルチフェロイクス

    Grant number:18F18353  2018.11 - 2021.10

    科学研究費補助金 

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    Authorship:Principal investigator 

  3. 界面スピン-軌道結合制御と反強磁性スピンメカニクスの学理構築

    2017.4 - 2020.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  4. マグノン-ソリトンの電界生成と伝播の機構解明

    2016.4 - 2018.3

    科学研究費補助金  挑戦的萌芽研究

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    Authorship:Principal investigator 

  5. 量子井戸構造に基づく2次元金属薄膜への磁気機能の誘導とその応用展開

    2015.4 - 2019.3

    科学研究費補助金  基盤研究(A)

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    Authorship:Coinvestigator(s) 

  6. メタ磁性転移物質を舞台とした磁気界面マグノン変換と伝播・位相制御

    2015.4 - 2017.3

    科学研究費補助金  新学術領域研究

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    Authorship:Principal investigator 

  7. スピン流によるスピン波変調と磁気秩序制御の原理実証

    2014.4 - 2017.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  8. 格子・電荷変調に伴う磁気相転移の電界制御と機構解明 研究課題

    2014.4 - 2016.3

    科学研究費補助金  挑戦的萌芽研究

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    Authorship:Principal investigator 

  9. マルチフェロイク超薄膜へテロ構造における電荷/歪誘起電気-磁気交差相関の解明

    2013.4 - 2016.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  10. スピン偏極のユニバーサルな定量化技法 研究課題

    2011.4 - 2013.3

    科学研究費補助金  挑戦的萌芽研究

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    Authorship:Principal investigator 

  11. スピン流を介した量子構造の磁気秩序化ダイナミクス

    2010.4 - 2013.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  12. 磁気・電気相関効果に基づくスピン再配列の実験的検証

    2009.4 - 2011.3

    科学研究費補助金  挑戦的萌芽研究

  13. ペロブスカイトエンジニアリング:化学結合制御による新規非鉛強誘電体の設計

    2008.4 - 2011.3

    科学研究費補助金  基盤研究(A)

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    Authorship:Other 

  14. 磁性体/半導体接合におけるスピン注入・検出過程のダイナミックイメージング

    2006.4 - 2009.3

    科学研究費補助金  若手研究(A)

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    Authorship:Principal investigator 

  15. 光スピン励起を利用した磁性合金へのスピン注入

    2004.4 - 2007.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Coinvestigator(s) 

  16. ナノ磁性金属スピンフィルターによる半導体スピンプローブ

    2004.4 - 2006.3

    科学研究費補助金  特定領域研究

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    Authorship:Principal investigator 

  17. 近藤共鳴に対するスピン偏極電子の影響

    2004.4 - 2006.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  18. 磁区構造制御を用いた強磁性金属/半導体ナノ接合によるスピン検出

    2003.4 - 2004.3

    科学研究費補助金  特定領域研究

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    Authorship:Principal investigator 

  19. 多機能DMFCのオンラインシステム説計 研究課題

    2001.4 - 2006.3

    科学研究費補助金  特定領域研究

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    Authorship:Coinvestigator(s) 

  20. 金属磁性酸化物のナノ微細加工とスピン注入への応用 研究課題

    2001.4 - 2003.3

    科学研究費補助金 

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    Authorship:Coinvestigator(s) 

  21. 磁気光学プラスチック光ファイバの開発 研究課題

    2000.4 - 2003.3

    科学研究費補助金  基盤研究(S)

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    Authorship:Coinvestigator(s) 

  22. ジグザグ形状微小磁性体における磁気・伝導現象

    2000.4 - 2002.3

    科学研究費補助金  奨励研究

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    Authorship:Principal investigator 

  23. ダブル・ペロブスカイトにおける新規機能の創出 研究課題

    1999.4 - 2003.3

    科学研究費補助金  基盤研究(A)

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    Authorship:Coinvestigator(s) 

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Social Contribution 1

  1. Associate Editor, NPG Asia Materials (Springer Nature)

    Role(s):Editer

    2001.8

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    Audience: Researchesrs

    Type:Newspaper, magazine