Updated on 2024/04/02

写真a

 
IIHAMA Satoshi
 
Organization
Graduate School of Engineering Materials Physics 1 Associate professor
Undergraduate School
School of Engineering Physical Science and Engineering
Title
Associate professor

Research Interests 6

  1. Magnetism

  2. Magnetization dynamics

  3. Ferromagnetic resonance

  4. Photo-spin

  5. Spintronics

  6. Pump-probe technique

Research Areas 3

  1. Nanotechnology/Materials / Nanomaterials

  2. Nanotechnology/Materials / Thin film/surface and interfacial physical properties

  3. Nanotechnology/Materials / Applied physical properties  / Magnetism

Research History 10

  1. Tohoku University   Frontier Research Institute for Interdisciplinary Sciences

    2023.7

  2. University of Lorraine   Institut Jean Lamour   Invited Professor

    2023.4 - 2023.5

  3. Japan Science and Technology Agency   PRESTO researcher

    2022.10

  4. Tohoku University

    2021.7

  5. Tohoku University   Advanced Institute for Materials Research   Assistant Professor

    2018.4 - 2020.3

  6. Institut Jean Lamour, Universite de Lorraine

    2017.4 - 2018.3

  7. National Institute of Advanced Industrial Science and Technology   Spintronics Research Center

    2016.4 - 2018.3

  8. Japan Society for the Promotion of Science

    2016.4 - 2018.3

  9. Japan Society for the Promotion of Science

    2014.4 - 2016.3

  10. Tohoku University   Department of Applied Physics

    2011.4 - 2016.3

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Education 3

  1. Tohoku University   Department of Applied Physics Doctoral Course

    2013.4 - 2016.3

  2. Tohoku University   Department of Applied Physics Master's Course

    2011.4 - 2013.3

  3. Tohoku University   Department of Engineering   Department of Information and Intelligent Systems

    2007.4 - 2011.3

Professional Memberships 2

  1. The Japan Society of Applied Physics

    2011.9

  2. The Magnetics Society of Japan

    2011.9

Awards 12

  1. Harada Young Researcher Award

    2023.7   Honda Memorial Foundation   Optically induced spin dynamics in metallic magnetic heterostructure

    Satoshi Iihama

  2. Poster Award in the 83rd JSAP Autumn Meeting 2022

    2022.11   The Japan Society of Applied Physics   Opical spin generation using Bi/Ag interface

    Satoshi Iihama, Michel Hehn, Kazuaki Ishibashi, Stephane Mangin, Shigemi Mizukami

  3. Featured Article

    2022.1   Journal of Applied Physics   Photon spin angular momentum driven magnetization dynamics in ferromagnet/heavy metal bilayers

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

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    Award type:Honored in official journal of a scientific society, scientific journal 

  4. Featured Article

    2020.9   Applied Physics Letters   All-optical probe of magnetization precession modulated by spin-orbit torque

    Kazuaki Ishibashi, Satoshi Iihama, Yutaro Takeuchi, Kaito Furuya, Shun Kanai, Shunsuke Fukami, Shigemi Mizukami

  5. Poster award

    2020.2   Symposium for The Core Research Clusters for Materials Science and Spintronics   Spin-orbit torque generated by disordered atomic structure of metallic glass

    Satoshi Iihama

  6. Editor's pick

    2019.9   Applied Physics Letters   All-optical detection and evaluation of magnetic damping in synthetic antiferromagnet

    Akira Kamimaki, Satoshi Iihama, Tomohiro Taniguchi, Shigemi Mizukami

  7. Research Award

    2016.3   Tohoku University  

    Satoshi Iihama

  8. Encouragement award for applied physics research

    2016.3   Department of Applied Physics, Tohoku University  

    Satoshi Iihama

  9. Uchiyama Prize

    2015.9   Magnetic Society of Japan  

    Satoshi Iihama

  10. Editor's suggestion

    2014.5   Physical Review B   Gilbert damping constants of Ta/CoFeB/MgO(Ta) thin films measured by optical detection of precessional magnetization dynamics

    Satoshi Iihama, Shigemi Mizukami, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

  11. Sakurai presentation prize

    2013.9   Magnetic Society of Japan  

    Satoshi Iihama

  12. Presentation Award

    2012.12   The Japan Society of Applied Physics, Tohoku Division  

    Satoshi Iihama

▼display all

 

Papers 49

  1. Different spin relaxation properties observed in linearly and circularly polarized laser induced terahertz emission from a Bi/Co bilayer Reviewed

    Kazuaki Ishibashi, Satoshi Iihama, Shigemi Mizukami

    Physical Review B   Vol. 107 ( 14 ) page: 144413   2023.4

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

    DOI: 10.1103/physrevb.107.144413

    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.107.144413/fulltext

  2. Photon spin angular momentum driven magnetization dynamics in ferromagnet/heavy metal bilayers Invited Reviewed

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    Journal of Applied Physics   Vol. 131 ( 2 ) page: 023901 - 023901   2022.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    DOI: 10.1063/5.0073409

  3. Spin-transport Mediated Single-shot All-optical Magnetization Switching of Metallic Films Invited Reviewed

    Satoshi Iihama, Quentin Remy, Junta Igarashi, Grégory Malinowski, Michel Hehn, Stéphane Mangin

    Journal of the Physical Society of Japan   Vol. 90 ( 8 ) page: 081009 - 081009   2021.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    DOI: 10.7566/jpsj.90.081009

    Scopus

  4. Interface-induced field-like optical spin torque in a ferromagnet/heavy metal heterostructure Reviewed

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    Nanophotonics   Vol. 10 ( 3 ) page: 1169 - 1176   2021.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    <title>Abstract</title>
    The manipulation of magnetization in a metallic ferromagnet by using optical helicity has been much attracted attention for future opto-spintronic devices. The optical helicity–induced torques on the magnetization, <italic>optical spin torque</italic>, have been observed in ferromagnetic thin films recently. However, the interfacial effect of the optical spin torque in ferromagnet/nonmagnetic heavy metal heterostructures have not been addressed so far, which are widely utilized to efficiently control magnetization via electrical means. Here, we studied optical spin torque vectors in the ferromagnet/nonmagnetic heavy metal heterostructures and observed that in-plane field-like optical spin torque was significantly increased with decreasing ferromagnetic layer thicknesses. The interfacial field-like optical spin torque was explained by the optical Rashba–Edelstein effect caused by the structural inversion symmetry breaking. This work will aid in the efficient optical manipulation of thin film nanomagnets using optical helicity.

    DOI: 10.1515/nanoph-2020-0571

    Other Link: https://www.degruyter.com/document/doi/10.1515/nanoph-2020-0571/xml

  5. All-optical probe of magnetization precession modulated by spin-orbit torque Reviewed International journal

    Kazuaki Ishibashi, Satoshi Iihama, Yutaro Takeuchi, Kaito Furuya, Shun Kanai, Shunsuke Fukami, Shigemi Mizukami

    APPLIED PHYSICS LETTERS   Vol. 117 ( 12 ) page: 122403   2020.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Laser-induced magnetization precession modulated by an in-plane direct current was investigated in a W/CoFeB/MgO micron-sized strip using an all-optical time-resolved magneto-optical Kerr effect microscope. We observed a relatively large change in the precession frequency, owing to a current-induced spin–orbit torque. The generation efficiency of the spin–orbit torque was evaluated as 0.35 +- 0.03, which was in accordance with that evaluated from the modulation of damping. This technique may become an alternate method for the evaluation of spin–orbit torque.

    DOI: 10.1063/5.0020852

    Web of Science

  6. Composition dependence of the spin-anomalous Hall effect in a ferromagnetic Fe-Co alloy Reviewed

    Yuya Koike, Satoshi Iihama, Shigemi Mizukami

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59   page: 90907   2020.8

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

    DOI: 10.35848/1347-4065/abac40

    Other Link: https://iopscience.iop.org/article/10.35848/1347-4065/abac40/pdf

  7. Spin-orbit torque generated by a ferromagnet / a metallic glass bilayer Reviewed International journal

    Satoshi Iihama, Yuya Koike, Zhen Lu, Kentaro WATANABE, Mingwei Chen, Shigemi Mizukami

    APPLIED PHYSICS EXPRESS   Vol. 13   page: 53003   2020.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    DOI: 10.35848/1882-0786/ab8742

  8. All-optical detection and evaluation of magnetic damping in synthetic antiferromagnet Reviewed International journal

    Akira Kamimaki, Satoshi Iihama, Tomohiro Taniguchi, Shigemi Mizukami

    APPLIED PHYSICS LETTERS   Vol. 115   page: 132402   2019.9

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

    DOI: 10.1063/1.5116058

  9. Single-Shot Multi-Level All-Optical Magnetization Switching Mediated by Spin Transport Reviewed International coauthorship International journal

    Satoshi Iihama, Yong Xu, Marwan Deb, Gregory Malinowski, Michel Hehn, Jon Gorchon, Eric E. Fullerton, Stephane Mangin

    ADVANCED MATERIALS   Vol. 30   page: 1804004   2018.10

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

    DOI: 10.1002/adma.201804004

  10. Spin-transfer torque induced by the spin anomalous Hall effect Reviewed International journal

    Satoshi Iihama, Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Yoichi Shiota, Sumito Tsunegi, Ryo Hiramatsu, Shinji Yuasa, Yoshishige Suzuki, Hitoshi Kubota

    NATURE ELECTRONICS   Vol. 1 ( 2 ) page: 120 - 123   2018.2

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

    The anomalous Hall effect in ferromagnets is a well-known phenomenon in which electromotive force is generated in the direction perpendicular to both the electric current and the magnetization. With nonmagnetic heavy metals, the generation of spin current by the spin Hall effect, as well as excitation of magnetization dynamics in an adjacent ferromagnet by spin-transfer torque, has been reported. However, the generation of a spin current in ferromagnets by the anomalous Hall effect has so far not been measured. Here we report the observation of spin current generation by the anomalous Hall effect through spin-transfer torque excitation in CoFeB/Cu/NiFe trilayer films. In this spin anomalous Hall effect, a spin current generated in the CoFeB by the anomalous Hall effect is injected into the NiFe and excites spin-transfer torque in the NiFe. This leads to a measurable modulation in the ferromagnetic resonance linewidth of the NiFe. The spin anomalous Hall angle in the CoFeB is estimated to be -0.14 +/- 0.05, which is comparable to the spin Hall angle reported in heavy metals.

    DOI: 10.1038/s41928-018-0026-z

    Web of Science

  11. Influence of L1(0) order parameter on Gilbert damping constants for FePd thin films investigated by means of time-resolved magneto-optical Kerr effect Reviewed International journal

    Satoshi Iihama, Akimasa Sakuma, Hiroshi Naganuma, Mikihiko Oogane, Shigemi Mizukami, Yasuo Ando

    PHYSICAL REVIEW B   Vol. 94 ( 17 ) page: 174425   2016.11

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

    We have systematically investigated the Gilbert damping constant a for L1(0)-FePd films using the time-resolved magneto-optical Kerr effect (TRMOKE). The field angle dependence of TRMOKE signals was measured and analyzed. The field angle dependence of the lifetime of magnetization precession was explained by evaluating extrinsic contributions such as the anisotropy distribution and two-magnon scattering. The crystalline uniaxial perpendicular magnetic anisotropy constant K-u and alpha values were evaluated for FePd films for various L1(0) order parameters S. K-u values of approximately 15 Merg/cm(3) were obtained for films with large-S values (i.e., over 0.8). In addition, alpha for the low-S film was found to be approximately 0.007 and decreased with increasing S. Smaller values of alpha (of 0.002-0.004) were obtained for films with S values of approximately 0.6-0.8. Results revealed that FePd films have both large-K-u and small-alpha values, which is a useful property for low-power magnetization switching while maintaining high thermal stability in spin-transfer-torque magnetoresistive random access memory applications.

    DOI: 10.1103/PhysRevB.94.174425

    Web of Science

  12. Quantification of a propagating spin-wave packet created by an ultrashort laser pulse in a thin film of a magnetic metal Reviewed International journal

    S. Iihama, Y. Sasaki, A. Sugihara, A. Kamimaki, Y. Ando, S. Mizukami

    PHYSICAL REVIEW B   Vol. 94 ( 2 )   2016.7

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

    Coherent spin-wave generation by focused ultrashort laser pulse irradiation was investigated for a permalloy thin film atmicrometer scale using an all-optical space-and time-resolved magneto-opticalKerr effect microscope. The spin-wave packet propagating perpendicular to the magnetization direction was clearly observed; however, that propagating parallel to the magnetization direction was not observed. The propagation length, group velocity, center frequency, and packet width of the observed spin-wave packet were evaluated and quantitatively explained in terms of the propagation of a magnetostatic spin wave driven by the ultrafast change of an out-of-plane demagnetization field induced by the focused-pulse laser.

    DOI: 10.1103/PhysRevB.94.020401

    Web of Science

  13. Ultrafast demagnetization of L1(0) FePt and FePd ordered alloys Reviewed International journal

    Satoshi Iihama, Yuta Sasaki, Hiroshi Naganuma, Mikihiko Oogane, Shigemi Mizukami, Yasuo Ando

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   Vol. 49 ( 3 ) page: 035002   2016.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    The cause of the time scale for ultrafast demagnetization induced by irradiation using a fs pulse laser remains an open issue. Spin-flip mediated by electron-phonon scattering due to spin-orbit interactions is one major theory proposed to explain ultrafast demagnetization. Ultrafast demagnetization in Ni, FePd, and FePt films was investigated in order to systematically study the influence of heavy elements on the demagnetization time. The ultrafast demagnetization in these systems was analyzed using the microscopic three temperature model, which is a theory based on spin-flip mediated by electron-phonon scattering. The spin-flip probability (a(sf)) values for the Ni, FePd, and FePt films were evaluated in the low pump fluence regime. It was found that the a(sf) value for the Ni film was larger than that for the FePd and FePt films. Thus, there is no correlation between the a(sf) value and the spin-orbit coupling strength. Fast demagnetization of the FePd film was also observed due to large electron-phonon scattering. In addition, it was found that the a(sf) values decreased with increasing magnetization quenching for all the films.

    DOI: 10.1088/0022-3727/49/3/035002

    Web of Science

  14. Magnetization dynamics and damping for L10-FePd thin films with perpendicular magnetic anisotropy Reviewed

    S. Iihama, M. Khan, H. Naganuma, M. Oogane, T. Miyazaki, S. Mizukami, Y. Ando

    JOURNAL OF THE MAGNETIC SOCIETY OF JAPAN   Vol. 39 ( 2 ) page: 57 - 61   2015.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Magnetics Society of Japan  

    Magnetization dynamics and damping for FePd films were investigated using the all-optical time-resolved magneto-optical Kerr effect. We deposited 16-nm-thick FePd thin films on a single crystal MgO(001) substrate. Both in-plane magnetic anisotropy and perpendicular magnetic anisotropy (PMA) FePd films were fabricated using the magnetron sputtering method at various substrate temperatures <i>T</i><sub>s</sub>. The dependencies of magnetization dynamics on the external magnetic field angle at fixed external magnetic field strengths were analyzed. The effective damping constant, <i>α</i><sub>eff</sub>, for FePd films with PMA exhibited anisotropy, whereas the <i>α</i><sub>eff</sub> for FePd with in-plane magnetic anisotropy did not depend significantly on the field angle. A uniaxial crystalline magnetic anisotropy constant, <i>K</i><sub>u1</sub>, of 11 Merg/cm<sup>3</sup> and a minimum for <i>α</i><sub>eff</sub> of 0.007 were observed for film prepared at <i>T</i><sub>s</sub> = 200°C. This <i>α</i><sub>eff</sub> value was much smaller than that for other Fe- and Co-based materials with large PMA such as <i>L</i>1<sub>0</sub>-FePt alloy, Co/Pt(Pd) multilayers.

    DOI: 10.3379/msjmag.1501R004

    CiNii Books

    Other Link: https://jlc.jst.go.jp/DN/JLC/20007068766?from=CiNii

  15. Low precessional damping observed for L1(0)-ordered FePd epitaxial thin films with large perpendicular magnetic anisotropy Reviewed International journal

    S. Iihama, A. Sakuma, H. Naganuma, M. Oogane, T. Miyazaki, S. Mizukami, Y. Ando

    APPLIED PHYSICS LETTERS   Vol. 105 ( 14 ) page: 142403   2014.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    High-quality L1(0) ordered 20 nm-thick FePd epitaxial thin films with a large perpendicular magnetic anisotropy were fabricated using a SrTiO3 substrate. The uniaxial crystalline magnetic anisotropy constant Ku evaluated for the films annealed above 500 degrees C was 14 Merg/cm(3). A very low effective damping constant, alpha(eff) = 0.007, was observed for FePd thin films annealed at 500 degrees C. This value is smaller than that of other Fe-based ordered alloys with a large perpendicular magnetic anisotropy. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4897547

    Web of Science

  16. Gilbert damping constants of Ta/CoFeB/MgO(Ta) thin films measured by optical detection of precessional magnetization dynamics Reviewed

    Satoshi Iihama, Shigemi Mizukami, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

    PHYSICAL REVIEW B   Vol. 89 ( 17 ) page: 174416   2014.5

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

    The magnetization dynamics of both Ta/CoFeB/MgO and Ta/CoFeB/Ta films were investigated using an all-optical pump-probe method. The magnetic field strength and the applied field direction dependencies of the precession frequency and the relaxation time were explained well by the Landau-Lifshitz-Gilbert equation when taking the magnetic anisotropy distribution in the film into account. The thickness dependence of the a values obtained for both stacked films was also discussed. The a values increased linearly with increasing inverse CoFeB thickness (t(CoFeB)). The slope of the a vs 1/t(CoFeB) characteristic for Ta/CoFeB/MgO films was smaller than that for Ta/CoFeB/Ta films, implying that the enhancement of a was caused by the CoFeB/Ta interface. Comparison of the annealing temperature dependence of a and the perpendicular magnetic anisotropy constant Ku revealed no correlation between a and Ku.

    DOI: 10.1103/PhysRevB.89.174416

    Web of Science

  17. Observation of Precessional Magnetization Dynamics in L1(0)-FePt Thin Films with Different L1(0) Order Parameter Values Reviewed International journal

    Satoshi Iihama, Shigemi Mizukami, Nobuhito Inami, Takashi Hiratsuka, Gukcheon Kim, Hiroshi Naganuma, Mikihiko Oogane, Terunobu Miyazaki, Yasuo Ando

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 52 ( 7 ) page: 073002   2013.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Fast magnetization precession was observed in L1(0)-FePt thin films with different L1(0) order parameter values by all optical pump-probe technique. Precession frequency was varied widely for the films with different order parameter, which is due to large difference in perpendicular magnetic anisotropy. Gilbert damping constant (alpha) was estimated from relaxation time as apparent damping. Clear difference in alpha was not observed with different perpendicular magnetic anisotropy. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.073002

    Web of Science

  18. Damping of Magnetization Precession in Perpendicularly Magnetized CoFeB Alloy Thin Films Reviewed International journal

    Satoshi Iihama, Qinli Ma, Takahide Kubota, Shigemi Mizukami, Yasuo Ando, Terunobu Miyazaki

    APPLIED PHYSICS EXPRESS   Vol. 5 ( 8 ) page: 083001   2012.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    Gilbert damping is investigated in perpendicularly magnetized CoFeB thin films using ferromagnetic resonance and time-resolved magneto-optical Kerr effect. The CoFeB films were deposited on a MgO layer and annealed at different temperatures. The lowest effective damping constant alpha(eff) values were 0.017, 0.013, and 0.009 for the films annealed at 250, 300, and 350 degrees C, respectively; these values were smaller than the values reported previously. (C) 2012 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.5.083001

    Web of Science

  19. Universal scaling between wave speed and size enables nanoscale high-performance reservoir computing based on propagating spin-waves Reviewed

    Satoshi Iihama, Yuya Koike, Shigemi Mizukami, Natsuhiko Yoshinaga

    npj Spintronics   Vol. 2 ( 1 )   2024.3

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Physical implementation of neuromorphic computing using spintronics technology has attracted recent attention for the future energy-efficient AI at nanoscales. Reservoir computing (RC) is promising for realizing the neuromorphic computing device. By memorizing past input information and its nonlinear transformation, RC can handle sequential data and perform time-series forecasting and speech recognition. However, the current performance of spintronics RC is poor due to the lack of understanding of its mechanism. Here we demonstrate that nanoscale physical RC using propagating spin waves can achieve high computational power comparable with other state-of-art systems. We develop the theory with response functions to understand the mechanism of high performance. The theory clarifies that wave-based RC generates Volterra series of the input through delayed and nonlinear responses. The delay originates from wave propagation. We find that the scaling of system sizes with the propagation speed of spin waves plays a crucial role in achieving high performance.

    DOI: 10.1038/s44306-024-00008-5

    Other Link: https://www.nature.com/articles/s44306-024-00008-5

  20. Enhancement of spin-charge conversion efficiency for Co3Sn2S2 across transition from paramagnetic to ferromagnetic phase Reviewed

    Takeshi Seki, Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara, Akihiro Ozawa, Satoshi Iihama, Kentaro Nomura, Atsushi Tsukazaki

    Physical Review Research   Vol. 5 ( 1 ) page: 013222   2023.3

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

    DOI: 10.1103/physrevresearch.5.013222

    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.5.013222/fulltext

  21. Spin-orbit torque in a Ni-Fe single layer Reviewed

    Takeshi Seki, Yong Chang Lau, Satoshi Iihama, Koki Takanashi

    Physical Review B   Vol. 104 ( 9 ) page: 094430   2021.9

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

    We evaluated the self-induced spin-orbit torque (SOT) in a single ferromagnetic layer. Spin-torque ferromagnetic resonance (ST-FMR) was measured for the very thin Ni-Fe (permalloy, Py) layers with and without structural inversion symmetry: asymmetric and symmetric Py layers. For both structures, the fieldlike component coming from the Oersted field clearly appeared. On the other hand, the dampinglike component was observed only for asymmetric Py with thickness . This dampinglike torque is attributable to the significant spatial change in the properties of Py. We propose a toy model to analyze the self-induced SOT.

    DOI: 10.1103/PhysRevB.104.094430

    Scopus

  22. Enhanced tunnel magnetoresistance in Mn-based perpendicular magnetic tunnel junctions utilizing antiferromagnetically coupled bcc-Co-based interlayer Reviewed

    Kazuya Z. Suzuki, Tomohiro Ichinose, Satoshi Iihama, Ren Monma, Shigemi Mizukami

    Applied Physics Letters   Vol. 118 ( 17 ) page: 172412 - 172412   2021.4

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

    DOI: 10.1063/5.0042899

  23. Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal Reviewed

    Shinji Miwa, Satoshi Iihama, Takuya Nomoto, Takahiro Tomita, Tomoya Higo, Muhammad Ikhlas, Shoya Sakamoto, YoshiChika Otani, Shigemi Mizukami, Ryotaro Arita, Satoru Nakatsuji

    Small Science   Vol. 1 ( 5 ) page: 2000062 - 2000062   2021.4

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

    DOI: 10.1002/smsc.202000062

    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/smsc.202000062

  24. Parity-controlled spin-wave excitations in synthetic antiferromagnets Reviewed

    A. Sud, Y. Koike, S. Iihama, C. Zollitsch, S. Mizukami, H. Kurebayashi

    APPLIED PHYSICS LETTERS   Vol. 118 ( 3 ) page: 032403 - 032403   2021.1

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

    DOI: 10.1063/5.0037427

  25. Spin injection characteristics of Py/graphene/Pt by gigahertz and terahertz magnetization dynamics driven by femtosecond laser pulse Reviewed

    H. Idzuchi, S. Iihama, M. Shimura, A. Kumatani, S. Mizukami, Y.P. Chen

    AIP ADVANCES   Vol. 11 ( 1 ) page: 15321 - 015321   2021.1

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

    DOI: 10.1063/9.0000114

  26. Engineering Single-Shot All-Optical Switching of Ferromagnetic Materials Reviewed International journal

    Junta Igarashi, Quentin Remy, Satoshi Iihama, Grégory Malinowski, Michel Hehn, Jon Gorchon, Julius Hohlfeld, Shunsuke Fukami, Hideo Ohno, Stéphane Mangin

    NANO LETTERS   Vol. 12 ( 12 ) page: 8654 - 8660   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMERICAN CHEMICAL SOCIETY  

    Since it was recently demonstrated in a spin-valve structure, magnetization reversal of a ferromagnetic layer using a single ultrashort optical pulse has attracted attention for future ultrafast and energy-efficient magnetic storage or memory devices. However, the mechanism and the role of the magnetic properties of the ferromagnet as well as the time scale of the magnetization switching are not understood. Here, we investigate single-shot all-optical magnetization switching in a GdFeCo/Cu/[Co
    x
    Ni1-x/Pt] spin-valve structure. We demonstrate that the threshold fluence for switching both the GdFeCo and the ferromagnetic layer depends on the laser pulse duration and the thickness and the Curie temperature of the ferromagnetic layer. We are able to explain most of the experimental results using a phenomenological model. This work provides a way to engineer ferromagnetic materials for energy efficient single-shot all-optical magnetization switching.

    DOI: 10.1021/acs.nanolett.0c03373

    PubMed

  27. Energy Efficient Control of Ultrafast Spin Current to Induce Single Femtosecond Pulse Switching of a Ferromagnet Reviewed International journal

    Quentin Remy, Junta Igarashi, Satoshi Iihama, Grégory Malinowski, Michel Hehn, Jon Gorchon, Julius Hohlfeld, Shunsuke Fukami, Hideo Ohno, Stéphane Mangin

    ADVANCED SCIENCE   Vol. 7 ( 23 ) page: 2001996 - 2001996   2020.10

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

    New methods to induce magnetization switching in a thin ferromagnetic material using femtosecond laser pulses without the assistance of an applied external magnetic field have recently attracted a lot of interest. It has been shown that by optically triggering the reversal of the magnetization in a GdFeCo layer, the magnetization of a nearby ferromagnetic thin film can also be reversed via spin currents originating in the GdFeCo layer. Here, using a similar structure, it is shown that the magnetization reversal of the GdFeCo is not required in order to reverse the magnetization of the ferromagnetic thin film. This switching is attributed to the ultrafast spin current and can be generated by the GdFeCo demagnetization. A larger energy efficiency of the ferromagnetic layer single pulse switching is obtained for a GdFeCo with a larger Gd concentration. Those ultrafast and energy efficient switchings observed in such spintronic devices open a new path toward ultrafast and energy efficient magnetic memories.

    DOI: 10.1002/advs.202001996

    PubMed

  28. Tunable magnon-magnon coupling in synthetic antiferromagnets Reviewed

    A. Sud, C. W. Zollitsch, A. Kamimaki, T. Dion, S. Khan, S. Iihama, S. Mizukami, H. Kurebayashi

    PHYSICAL REVIEW B   Vol. 102 ( 10 ) page: 100403(R)   2020.9

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

    DOI: 10.1103/PhysRevB.102.100403

    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.102.100403/fulltext

  29. Laser-induced THz emission from layered synthetic magnets Reviewed

    Yuma Ogasawara, Yuta Sasaki, Satoshi Iihama, Akira Kamimaki, Kazuya Suzuki, Shigemi Mizukami

    APPLIED PHYSICS EXPRESS   Vol. 13 ( 6 ) page: 63001   2020.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    We investigated laser-pulse-induced terahertz (THz) emission in Ta/CoFeB/Ir/CoFeB/Ta layered synthetic magnets with different Ir spacer thicknesses. THz emissions were observed under no applied magnetic fields for samples exhibiting interlayer antiferromagnetic exchange couplings, and those THz emissions also showed oscillatory behavior against the Ir spacer thicknesses. These results are qualitatively explained with the THz emission mechanism due to the inverse spin Hall effect for the laser-induced spin current in the layered structures. We also discuss the effect of a non-collinear configuration of magnetizations on THz emission with macrospin simulation.

    DOI: 10.35848/1882-0786/ab88c2

    Scopus

  30. Parametric amplification of magnons in synthetic antiferromagnets Reviewed

    A. Kamimaki, S. Iihama, K. Suzuki, N. Yoshinaga, S. Mizukami

    PHYSICAL REVIEW APPLIED   Vol. 13 ( 4 ) page: 44036   2020.3

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

    DOI: 10.1103/PhysRevApplied.13.044036

    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevApplied.13.044036/fulltext

  31. Effect of Co and Fe stoichiometry on terahertz emission from Ta/(Co(x)Fe(1-x))(80)B(20)/MgO thin films Reviewed

    Yuta Sasaki, Yohei Kota, Satoshi Iihama, Kazuya Z. Suzuki, Akimasa Sakuma, Shigemi Mizukami

    PHYSICAL REVIEW B, Rapid Communications   Vol. 100 ( 14 ) page: 140406   2019.11

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

    Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.

    DOI: 10.1103/PhysRevB.100.140406

    Scopus

  32. Large spin anomalous Hall effect in L1(0)-FePt: Symmetry and magnetization switching Reviewed

    Takeshi Seki, Satoshi Iihama, Tomohiro Taniguchi, Koki Takanashi

    PHYSICAL REVIEW B   Vol. 100   page: 144427   2019.10

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

    DOI: 10.1103/PhysRevB.100.144427

  33. Synthesis of metastable B2-type Fe-Sn alloy epitaxial films and study of their magnetic properties Reviewed

    Goto Yuki, Araki Masato, Takahashi Nozomi, Yanase Takashi, Shimada Toshihiro, Tsujikawa Masahito, Shirai Masafumi, Kamimaki Akira, Iihama Satoshi, Mizukami Shigemi, Nagahama Taro

    JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 57 ( 12 ) page: 120302   2018.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC APPLIED PHYSICS  

    DOI: 10.7567/JJAP.57.120302

    Web of Science

  34. Micro-Focused Pulse Laser-Induced Propagating Spin Waves in Permalloy Films With Different Thicknesses Reviewed

    Akira Kamimaki, Satoshi Iihama, Yuta Sasaki, Yasuo Ando, Shigemi Mizukami

    IEEE TRANSACTIONS ON MAGNETICS   Vol. 53 ( 11 ) page: 4300604   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Propagating spin waves excited by a micro-focused ultra-short pulse laser were investigated in Permalloy films with the thicknesses of 20, 50, and 100 nm by means of an all-optical space-and-time-resolved magneto-optical Kerr effect. Although various perpendicular standing spin-wave modes were excited, the propagating magneto-static surface spin wave was clearly detected in each film, where the group velocities of approximately 4, 8, and 12 km/s and the propagation lengths of 3.8, 6.6, and 13 mu m for the 20, 50, and 100 nm-thick films, respectively, were evaluated. The evaluated group velocities were consistent with the theoretical values, whereas the propagation lengths were smaller than the theoretical values with the Gilbert damping constant alpha of 0.008.

    DOI: 10.1109/TMAG.2017.2707421

    Web of Science

  35. Reciprocal excitation of propagating spin waves by a laser pulse and their reciprocal mapping in magnetic metal films Reviewed

    A. Kamimaki, S. Iihama, Y. Sasaki, Y. Ando, S. Mizukami

    PHYSICAL REVIEW B   Vol. 96 ( 1 ) page: 014438   2017.7

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    Focused pulse-laser-induced propagating magnetostatic surface spin waves (MSSWs) were investigated using an all-optical space-time-resolved magneto-optical Kerr effect microscope in 20-nm-thick permalloy thin films to clarify reciprocity and symmetry of MSSW emission. The microscope setup was constructed with variable direction of the applied magnetic field, and the corresponding angular dependence was examined. MSSWs were reciprocally emitted from the laser spot, in contrast to the nonreciprocal emission obtained by the antenna method. Specifically, the observed excitation amplitude and phase were independent of the propagation and magnetization directions within experimental error. By transforming the data into wave number-frequency space, the MSSW dispersion relation was clearly identified within the wave number of 2-3rad/mu m and frequency of 10 GHz. These observations are consistent with the model of ultrafast modulation of out-of-plane shape magnetic anisotropy inside the focused laser spot. In addition to confirming the symmetric and reciprocal emission of laser-induced MSSWs, the study demonstrated that this technique can provide all-optical microscopic spectroscopy for MSSW in metals, such as Brillouin light-scattering technique.

    DOI: 10.1103/PhysRevB.96.014438

    Web of Science

  36. Magnetic Anisotropy and Damping for Monolayer-Controlled Co-Ni Epitaxial Multilayer Reviewed

    Takeshi Seki, Junpei Shimada, Satoshi Iihama, Masahito Tsujikawa, Tomoyuki Koganezawa, Akihiro Shioda, Takayuki Tashiro, Weinan Zhou, Shigemi Mizukami, Masafumi Shirai, Koki Takanashi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 86 ( 7 ) page: 74710 - 1-10   2017.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Physical Society of Japan  

    Structures and magnetic properties were systematically investigated for the monolayer (ML)-controlled Co | Ni multilayers with various Ni layer thicknesses, where the Co and Ni layers were epitaxially grown on a Al<sub>2</sub>O<sub>3</sub>(<inline-formula><tex-math version="MathJax"><![CDATA[\(11\bar{2}0\)]]></tex-math></inline-formula>) single crystal substrate or deposited on a thermally oxidized Si substrate. The epitaxial Co | Ni multilayers exhibited high uniaxial magnetic anisotropy energies (<italic>K</italic><sub>u</sub>) and low effective magnetic damping constants (α<sub>eff</sub>), resulting in the perpendicular magnetization with low damping even for the 1 ML-Ni | 1 ML-Co multilayer. By comparing the experimental results with the first principles calculation, we found that the Ni atoms largely contributed to the perpendicular anisotropy for the Co | Ni multilayers. We also discussed the possible mechanism dominating the magnitude of α<sub>eff</sub>for the Co | Ni multilayers based on the experiments and the calculations. The present results suggest that the epitaxial Co | Ni multilayer is a promising material to achieve high <italic>K</italic><sub>u</sub>and low magnetic damping simultaneously.

    DOI: 10.7566/JSPJ.86.074710

    CiNii Books

  37. All-optical detection of magnetization precession in tunnel junctions under applied voltage Reviewed

    Yuta Sasaki, Kazuya Suzuki, Atsushi Sugihara, Akira Kamimaki, Satoshi Iihama, Yasuo Ando, Shigemi Mizukami

    APPLIED PHYSICS EXPRESS   Vol. 10 ( 2 ) page: 23002   2017.2

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    An all-optical time-resolved magneto-optical Kerr effect measurement of a micron-sized tunnel junction with a CoFeB electrode was performed. The femtosecond (fs) laser-induced magnetization precession was clearly observed at various magnetic field angles. The frequency f and relaxation time t of the magnetization precession varied with the voltage applied via a MgO barrier. The precession dynamics were in accordance with Kittel's ferromagnetic resonance mode, and the voltage- induced changes in f and t were well explained by the voltage- induced change in the perpendicular magnetic anisotropy of -36 fJ/Vm. (C) 2017 The Japan Society of Applied Physics

    DOI: 10.7567/APEX.10.023002

    Web of Science

  38. Magnetic relaxation for Mn-based compounds exhibiting the Larmor precession at THz wave range frequencies Reviewed

    S. Mizukami, S. Iihama, Y. Sasaki, A. Sugihara, R. Ranjbar, K. Z. Suzuki

    JOURNAL OF APPLIED PHYSICS   Vol. 120 ( 14 ) page: 142102   2016.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER INST PHYSICS  

    Mn-based hard magnets are potentially suitable for advanced ultra-high frequency spintronics applications because they exhibit the Larmor precession of magnetization at THz wave-range frequencies with low magnetic relaxation. However, the low magnetic relaxation properties are not well understood; thus, a more detailed study is necessary. In this study, magnetization precessions in L1(0) Mn1.54Ga, D0(22) Mn2.12Ga, and C38 MnAlGe epitaxial films grown on MgO substrates were investigated using an all-optical pump-probe method under a magnetic field of similar to 20 kOe. The coherent magnetization precessions at frequencies of more than 0.1, 0.2, and 0.3 THz for the C38 MnAlGe, L1(0) Mn1.54Ga, and D0(22) Mn2.12Ga films, respectively, were clearly measured. The effective damping constant for the C38 MnAlGe film was smaller than the previously reported value measured at 10 kOe by a factor of 2, whereas those showed a large angular dependence. The effective damping constants for the L1(0) Mn1.54Ga and D0(22) Mn2.12Ga films were independent of the field angle and approximately identical to the values measured at 10 kOe. Thus, it was concluded that the values for the Gilbert damping constant, a, were 0.008 and 0.012 for the L1(0) Mn1.54Ga and D0(22) Mn2.12Ga films, respectively. The possible origin of the discrepancy between the experimental and theoretical a values for these films is discussed. Published by AIP Publishing.

    DOI: 10.1063/1.4961704

    Web of Science

  39. Laser-induced THz magnetization precession for a tetragonal Heusler-like nearly compensated ferrimagnet Reviewed

    S. Mizukami, A. Sugihara, S. Iihama, Y. Sasaki, K. Z. Suzuki, T. Miyazaki

    APPLIED PHYSICS LETTERS   Vol. 108 ( 1 ) page: 12404   2016.1

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    Laser-induced magnetization precessional dynamics was investigated in epitaxial films of Mn3Ge, which is a tetragonal Heusler-like nearly compensated ferrimagnet. The ferromagnetic resonance (FMR) mode was observed, the precession frequency for which exceeded 0.5 THz and originated from the large magnetic anisotropy field of approximately 200 kOe for this ferrimagnet. The effective damping constant was approximately 0.03. The corresponding effective Landau-Lifshitz constant is approximately 60 Mrad/s and is comparable with those of the similar Mn-Ga materials. The physical mechanisms for the Gilbert damping and for the laser-induced excitation of the FMR mode were also discussed in terms of the spin-orbit-induced damping and the laser-induced ultrafast modulation of the magnetic anisotropy, respectively. (C) 2016 AIP Publishing LLC.

    DOI: 10.1063/1.4939447

    Web of Science

  40. 19pPSB-43 Thickness Dependence of Spin-Wave Propagation Induced by A Pulse Laser in Permalloy Films Reviewed

    Kamimaki A., Iihama S., Sasaki Y., Ando Y., Mizukami S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 71   page: 1169 - 1169   2016

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.71.1.0_1169

    CiNii Books

  41. Spin dynamics induced by ultrafast heating with ferromagnetic/antiferromagnetic interfacial exchange in perpendicularly magnetized hard/soft bilayers Reviewed

    Q. L. Ma, S. Iihama, X. M. Zhang, T. Miyazaki, S. Mizukami

    APPLIED PHYSICS LETTERS   Vol. 107 ( 22 ) page: 222404   2015.11

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    The laser-induced spin dynamics of FeCo in perpendicularly magnetized L1(0)-MnGa/FeCo bilayers with ferromagnetic and antiferromagnetic interfacial exchange coupling ( IEC) are examined using the time-resolved magneto-optical Kerr effect. We found a precessional phase reversal of the FeCo layer as the IEC changes from ferromagnetic to antiferromagnetic. Moreover, a precession-suspension window was observed when the magnetic field was applied in a certain direction for the bilayer with ferromagnetic IEC. Our observations reveal that the spin dynamics modulation is strongly dependent on the IEC type within the Landau-Lifshitz-Gilbert depiction. The IEC dependence of the precessional phase and amplitude suggests the interesting method for magnetization dynamics modulation. (C) 2015 AIP Publishing LLC.

    DOI: 10.1063/1.4936598

    Web of Science

  42. Electrical Detection of Millimeter-Waves by Magnetic Tunnel Junctions Using Perpendicular Magnetized L1(0)-FePd Free Layer Reviewed

    Hiroshi Naganuma, G. Kirn, Yuki Kawada, Nobuhito Inami, Kenzo Hatakeyama, Satoshi Iihama, Khan Mohammed Nazrul Islam, Mikihiko Oogane, Shigemi Mizukami, Yasuo Ando

    NANO LETTERS   Vol. 15 ( 1 ) page: 623 - 628   2015.1

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

    Spin dynamics excited by spin-polarized current in magnetic tunnel junctions (MTJs) is potentially useful in nanoscale electrical oscillation sources and detection devices. A spin oscillator/detector should work at a high frequency, such as that of a millimeter-wave, where the quality of a semiconductor device is restricted by carrier mobility, the CR time constant, and so on. Developers of spin systems for practical use need to find out how to excite spin dynamics (i) in the millimeter-wave region, (ii) with low power consumption (ex: no external magnetic field, low damping material), and (iii) for broad frequency modulation. Here L1(0)-ordered FePd alloy with perpendicular magnetocrystalline anisotropy (PMA) and a low damping constant, 0.007, was used for the free layer in the MTJs, and a homodyne-detected ferromagnetic resonance (FMR) signal was obtained at around 30 GHz together with the possibility of one-octave frequency modulation. The FMR signal in out-of-plane magnetized L10-ordered FePd free layer could be excited without an external magnetic field by injecting in-plane spin polarized alternating current. This study shows the potential utility of L1(0)-ordered alloy materials such as FePt, CoPt, MnAl, and MnGa in a variety of millimeter-wave spin devices.

    DOI: 10.1021/nl504114v

    Web of Science

  43. 16pPSA-34 Space and time-resolved all-optical magneto-optical Kerr effect in NiFe films Reviewed

    Iihama S., Sasaki Y., Ando Y., Mizukami S.

    Meeting Abstracts of the Physical Society of Japan   Vol. 70   page: 846 - 846   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_846

    CiNii Books

  44. Magnetization dynamics for L1(0) MnGa/Fe exchange coupled bilayers Reviewed

    S. Mizukami, T. Kubota, S. Iihama, R. Ranjbar, Q. Ma, X. Zhang, Y. Ando, T. Miyazaki

    JOURNAL OF APPLIED PHYSICS   Vol. 115 ( 17 ) page: 17C119   2014.5

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    The precessional magnetization dynamics of L1(0) MnGa/Fe bilayers with a large perpendicular magnetic anisotropy are investigated using vector network analyzer ferromagnetic resonance (VNA-FMR) and time-resolved magneto-optical Kerr effect (TRMOKE). The MnGa/Fe(1 nm) bilayer exhibited perpendicular magnetization and MnGa/Fe(2 and 5 nm) bilayers showed in-plane magnetizations. The VNA-FMR and TRMOKE data for these bilayers are well explained from calculations, based on the coupled Landau-Lifshitz equations, taking into account the interfacial exchange coupling of 2.4 erg/cm(2). (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4868087

    Web of Science

  45. Static and dynamic magnetic properties of cubic Mn-Co-Ga Heusler films Reviewed

    A. S. Demiray, T. Kubota, S. Iihama, S. Mizukami, T. Miyazaki, H. Naganuma, M. Oogane, Y. Ando

    JOURNAL OF APPLIED PHYSICS   Vol. 115 ( 17 ) page: 17D133   2014.5

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    We investigated the static and dynamic magnetic properties of thin films of Mn-Co-Ga Heusler compound. Gilbert damping and exchange stiffness constants of the films were evaluated by using the ferromagnetic resonance technique in the X-band regime (f = 9.4 GHz). By analyzing the experimental spectra, magnetic parameters of the films such as the line width and the Gilbert damping were deduced, and the exchange stiffness constant was estimated from the perpendicular standing spin-wave resonance. The Gilbert damping constant was estimated to be 0.017 in a specific film composition. The exchange stiffness constant showed a linear dependence on the film composition. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4864250

    Web of Science

  46. Magnetization damping of an L1(0)-FeNi thin film with perpendicular magnetic anisotropy Reviewed

    Misako Ogiwara, Satoshi Iihama, Takeshi Seki, Takayuki Kojima, Shigemi Mizukami, Masaki Mizuguchi, Koki Takanashi

    APPLIED PHYSICS LETTERS   Vol. 103 ( 24 ) page: 242409   2013.12

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    We studied on the magnetic damping constants (alpha) for L1(0)-FeNi and disordered FeNi employing three kinds of measurement methods. An L1(0)-FeNi thin film exhibited high perpendicular magnetic anisotropy of 7.1 x 10(6) erg cm(-3). At magnetic fields (H) lower than 2 kOe, alpha was estimated to be 0.091 +/- 0.003. However, it was reduced down to 0.013 +/- 0.001 with H, indicating that extrinsic contributions enhance alpha. The intrinsic alpha = 0.013 +/- 0.001 was comparable to alpha = 0.009 +/- 0.002 for the disordered FeNi. This suggests that L1(0)-FeNi is a candidate achieving high magnetic anisotropy and low magnetization damping simultaneously. (C) 2013 AIP Publishing LLC.

    DOI: 10.1063/1.4845035

    Web of Science

  47. Effect of Mg interlayer on perpendicular magnetic anisotropy of CoFeB films in MgO/Mg/CoFeB/Ta structure Reviewed

    Q. L. Ma, S. Iihama, T. Kubota, X. M. Zhang, S. Mizukami, Y. Ando, T. Miyazaki

    APPLIED PHYSICS LETTERS   Vol. 101 ( 12 ) page: 122414   2012.9

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    The effects of Mg metallic interlayer on the magnetic properties of thin CoFeB films in MgO/Mg (t(Mg))/CoFeB (1.2nm)/Ta structures were studied in this letter. Our experimental result shows that the CoFeB film exhibits perpendicular magnetic anisotropy (PMA) when the CoFeB and MgO layers are separated by a metallic Mg layer with a maximum thickness of 0.8 nm. The origin of PMA was discussed by considering the preferential transmission of the Delta(1) symmetry preserved by the Mg interlayer in crystallized MgO/Mg/CoFeB/Ta. In addition, the thin Mg interlayer also contributes to enhancing the thermal stability and reducing the effective damping constant and coercivity of the CoFeB film. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4754118]

    DOI: 10.1063/1.4754118

    Web of Science

  48. Fabrication of L1(0)-MnAl perpendicularly magnetized thin films for perpendicular magnetic tunnel junctions Reviewed

    Masaki Hosoda, Mikihiko Oogane, Miho Kubota, Takahide Kubota, Haruaki Saruyama, Satoshi Iihama, Hiroshi Naganuma, Yasuo Ando

    JOURNAL OF APPLIED PHYSICS   Vol. 111 ( 7 ) page: 04A321   2012.4

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    Structural and magnetic properties of MnAl thin films with different composition, growth temperature, and post-annealing temperature were investigated. The optimum condition for fabrication of L1(0)-MnAl perpendicularly magnetized thin film deposited on Cr-buffered MgO single crystal substrate was revealed. The results of x ray diffraction indicated that the MnAl films annealed at proper temperature had a (001)-orientation and L1(0)-ordered structure. The L1(0)-ordered films were perpendicularly magnetized and had a large perpendicular anisotropy. In addition, low surface roughness was achieved. For the optimized fabrication condition, the saturation magnetization M-s of 600 emu/cm(3) and perpendicular magnetic anisotropy K-u of 1.0 x 10(7) erg/cm(3) was obtained using the Mn48Al52 target at deposition temperature of 200 degrees C and post-annealing temperature of 450 degrees C. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676428]

    DOI: 10.1063/1.3676428

    Web of Science

  49. Fast magnetization precession observed in L1(0)-FePt epitaxial thin film Reviewed

    S. Mizukami, S. Iihama, N. Inami, T. Hiratsuka, G. Kim, H. Naganuma, M. Oogane, Y. Ando

    APPLIED PHYSICS LETTERS   Vol. 98 ( 5 ) page: 052501   2011.1

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    Fast magnetization precession is observed in L1(0)-FePt alloy epitaxial thin films excited and detected by all-optical means. The precession frequency varies from 45 to 65 GHz depending on the applied magnetic field strength and direction, which can be explained by a uniform precession model taking account of first- and second-order uniaxial magnetic anisotropy. The lowest effective Gilbert damping constant has a minimum value of 0.055, which is about half that in Co/Pt multilayers and is comparable to Ni/Co multilayers with perpendicular magnetic anisotropy. (C) 2011 American Institute of Physics. [doi:10.1063/1.3549704]

    DOI: 10.1063/1.3549704

    Web of Science

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Presentations 78

  1. Photonic spin-torque in ferromagnet/heavy metal heterostructures International conference

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    MRM2023/IUMRS-ICA2023  2023.12.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Kyoto  

  2. スピン波リザバー高性能化に向けた短期記憶容量のスケーリング

    飯浜 賢志, 小池 雄也, 水上 成美, 義永 那津人

    第47回日本磁気学会学術講演会  2023.9.27 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

  3. 極薄強磁性/非磁性ヘテロ構造における光スピントルクを利用した高効率光磁気記録

    飯浜賢志

    2023 旭硝子財団 助成研究発表会  2023.7.27 

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    Event date: 2023.7

    Language:Japanese   Presentation type:Poster presentation  

  4. Nano-scale physical reservoir computing based on propagating spin-wave International conference

    Satoshi Iihama, Yuya Koike, Shigemi Mizukami, Natsuhiko Yoshinaga

    Intermag Conference 2023  2023.5.19 

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

  5. Ultrafast direct photonic generation and manipulation of magnetization in heterostructure thin films Invited

    Satoshi Iihama

    IJL seminar  2023.5.3 

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (invited, special)  

  6. 光のヘリシティが誘起する強磁性体/重金属薄膜の磁化ダイナミクス Invited

    飯浜賢志, 石橋一晃, 水上成美

    日本磁気学会第239回研究会  2022.11.22 

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    Event date: 2022.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  7. Ultrafast photon-helicity driven spin-torques in ferromagnet/heavy metal heterostructures

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    The 6th Symposium for the Core Research Clusters for Materials Science and Spintronics  2022.10.25 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

  8. Optical spin generation using Bi/Ag interface

    Satoshi Iihama, Michel Hehn, Kazuaki Ishibashi, Stephane Mangin, Shigemi Mizukami

    The 83rd JSAP Autumn Meeting 2022  2022.9.21 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Poster presentation  

  9. Ulrafast photo-spin driven magnetization dynamics in ferromagnet/heavy metal thin film heterostructures Invited

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    Ultrafast Magnetism Conference 2022  2022.9.13 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  10. 光のスピン角運動量による強磁性体薄膜の磁化ダイナミクス制御 Invited

    飯浜賢志

    電気学会 光・熱・電気との相互作用を活用した高機能磁気デバイス技術調査専門委員会  2022.8.26 

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    Event date: 2022.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  11. Magnetization dynamics driven by a photon spin angular momentum in ferromagnet/heavy metal heterostructures

    S. Iihama, K. Ishibashi, S. Mizukami

    24th International Colloquium on Magnetic Films and Surfaces  2022.7.11 

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    Event date: 2022.7

    Language:English   Presentation type:Oral presentation (general)  

  12. 超短光パルス照射下での磁気イメージング Invited

    飯浜賢志

    第69回応用物理学会春季学術講演会  2022.3.22 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:ハイブリッド(青山学院大学)  

  13. Photon-driven magnetic phenomena Invited

    Satoshi Iihama

    VANJ Conference 2021  2021.12.5 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (invited, special)  

  14. Photo-spin driven spin-transfer torque in [Co/Pt] multilayer thin films with perpendicular magnetic anisotropy

    2021.10.25 

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    Event date: 2021.10

    Language:English   Presentation type:Poster presentation  

  15. Optical-helicity induced magnetization dynamics in [Co/Pt] multilayer thin films with perpendicular magnetic anisotropy

    The 82nd JSAP Autumn Meeting  2021.9.22 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Poster presentation  

  16. 超短光パルスを用いたフェリ磁性金属薄膜における全光学的磁化反転 Invited

    飯浜賢志, Quentin Remy, 五十嵐純太, Grégory Malinowski, Michel Hehn, Stéphane Mangin

    日本物理学会 2021年秋季大会  2021.9.23 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  17. 金属ヘテロ構造薄膜における超短光パルス誘起スピン流 Invited

    飯浜賢志

    物性物理オンラインセミナー  2021.6.26 

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    Event date: 2021.6

    Language:Japanese  

  18. Interface optical spin generation in a ferromagnet/heavy metal heterostructure

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    INTERMAG Conference 2021  2021.4.26 

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    Event date: 2021.4

    Language:English   Presentation type:Oral presentation (general)  

  19. Angular momentum mediated light-matter interaction

    Satoshi Iihama

    The 5th FRIS Retreat  2020.11.27 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Tohoku Univ.  

  20. Optical spin-torque observed in FeCo/Pt bilayer thin films International conference

    Satoshi Iihama, Shigemi Mizukami

    65th Annual Conference on Magnetism and Magnetic Materials 2020  2020.10.30 

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    Event date: 2020.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Online  

  21. All-optical single shot magnetization switching mediated by angular momentum transfer in spin-valve Invited International conference

    Satoshi Iihama, Junta Igarashi, Yong Xu, Marwan Deb, Grégory Malinowski, Michel Hehn, Jon Gorchon, Eric Fullerton, Shunsuke Fukami, Shigemi Mizukami, Stéphane Mangin

    64th Annual Conference on Magnetism and Magnetic Materials, MMM Conference 2019  2019.11.4 

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    Event date: 2019.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Las vegas, USA  

  22. Optical detection of magnetization dynamics and damping for synthetic antiferromagnet International conference

    Satoshi Iihama

    MATERIALS RESEARCH MEETING 2019  2019.12.11 

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    Language:English   Presentation type:Poster presentation  

    Venue:Yokohama  

  23. Optical control of magnetization in metallic heterostructure Invited

    Satoshi Iihama

    The 4th International Symposium for The Core Research Cluster for Spintronics  2021.2.25 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  24. Observation of spin-transfer torque induced by spin anomalous Hall effect

    S. Iihama, T. Taniguchi, K. Yakushiji, A. Fukushima, Y. Shiota, S. Tsunegi, S. Yuasa, Y. Suzuki, H. Kubota

    THE JAPAN SOCIETY OF APPLIED PHYSICS  2018.3.19 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Waseda University  

  25. Observation of spin torque induced by anomalous Hall effect using spin-torque diode spectrum in magnetic tunnel junction International conference

    S. Iihama, K. Yakushiji, T. Taniguchi, H. Kubota, S. Tsunegi, S. Tamaru, Y. Shiota, Y. Suzuki, A. Fukushima, S. Yuasa

    International Workshop & School on Spin Transfer  2016.9.19 

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    Language:English   Presentation type:Oral presentation (general)  

  26. Nano-scale reservoir computing based on propagating spin-waves in a ferromagnetic thin film

    Satoshi Iihama, Yuya Koike, Shigemi Mizukami, Natsuhiko Yoshinaga

    第70回応用物理学会春季学術講演会  2023.3.16 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  27. MgO/CoFeB垂直磁化膜における磁化歳差ダイナミクス

    飯浜賢志, 水上成美, 馬勤礼, 窪田崇秀, 永沼博, 大兼幹彦, 安藤康夫, 宮崎照宜

    第67回応用物理学会東北支部学術講演会  2012.12.6 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  28. Magnetization Precession with Low Damping for Perpendicularly Magnetized L10-FePd Films Grown on SrTiO3 Substrate

    S. Iihama, S. Mizukami, H. Naganuma, T. Miyazaki, M. Oogane, Y. Ando

    第75回応用物理学会秋季学術講演会  2014.9.17 

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    Language:Japanese   Presentation type:Poster presentation  

  29. Magnetization dynamics of L10-FePd thin films with different order parameter

    S. Iihama, H. Naganuma, S. Mizukami, T. Miyazaki, M. Khan, M. Oogane, Y. Ando

    第61回応用物理学会春季学術講演会  2014.3.17 

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    Presentation type:Poster presentation  

  30. Magnetization dynamics in CoFeB thin films with perpendicular magnetic anisotropy

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    International Conference of the Asian Union of Magnetics Societies  2012.10.2 

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    Language:English   Presentation type:Poster presentation  

  31. Magnetization dynamics in CoFeB thin films with perpendicular magnetic anisotropy

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, Y. Ando, T. Miyazaki

    Annual Meeting of Strategic Japanese-German Joint Research Program (ASPIMATT)  2013.7.1 

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    Language:English   Presentation type:Poster presentation  

  32. Magnetization dynamics for L10-FePd thin films with perpendicular magnetic anisotropy

    S. Iihama, M. Khan, H. Naganuma, M. Oogane, S. Mizukami, Y. Ando, T. Miyazaki

    58th Conference on Magnetism and Magnetic Materials  2013.11.4 

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    Language:English   Presentation type:Oral presentation (general)  

  33. Optical detection of magnetization dynamics for synthetic ferrimagnetic thin film and nano dots International conference

    Satoshi Iihama, Shigemi Mizukami

    MMM conference 2019  2019.11.4 

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    Language:English   Presentation type:Poster presentation  

    Venue:Las vegas, USA  

  34. Low Gilbert damping and high magnetic anisotropy in L10-FePd epitaxial thin films grown on MgO and SrTiO3 single crystal substrates

    S. Iihama, H. Naganuma, M. Oogane, S. Mizukami, Y. Ando

    20th International Conference on Magnetism  2015.7.5 

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    Language:English   Presentation type:Oral presentation (general)  

  35. Laser-induced spin-wave propagation in NiFe films

    S. Iihama, Y. Sasaki, Y. Ando, S. Mizukami

    ナノスピン変換年次報告会  2015.3.3 

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    Language:Japanese   Presentation type:Poster presentation  

  36. L10-FePt薄膜の高速磁化ダイナミクス測定によるダンピング定数の評価

    飯浜賢志, 水上成美, 井波暢人, 平塚喬士, 金国天, 永沼博, 大兼幹彦, 安藤康夫

    第66回応用物理学会東北支部学術講演会  2011.12.3 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  37. L10-FePt薄膜の高速磁化ダイナミクスの光学的検出

    飯浜賢志, 水上成美, 井波暢人, 平塚喬士, 金国天, 永沼博, 大兼幹彦, 安藤康夫

    第35回日本磁気学会学術講演会  2011.9.27 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  38. Investigation of ultrafast magnetization dynamics via pump-probe technique for materials with large perpendicular magnetic anisotropy Invited International conference

    Satoshi Iihama

    Institut Jean Lamour, Seminar  2017.5.4 

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    Presentation type:Oral presentation (invited, special)  

    Venue:Institut Jean Lamour, Nancy, France  

  39. Investigation of the spin-transfer torque generated by anomalous Hall effect

    S. Iihama, K. Yakushiji, T. Taniguchi, H. Kubota, S. Tsunegi, S. Tamaru, Y. Shiota, Y. Suzuki, A. Fukushima, S. Yuasa

    THE JAPAN SOCIETY OF APPLIED PHYSICS  2016.9.16 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  40. Interfacial influence on precessional magnetization dynamics of Ta/CoFeB/MgO thin films

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, T. Miyazaki, Y. Ando

    第60回応用物理学会春季学術講演会  2013.3.27 

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    Language:Japanese   Presentation type:Oral presentation (general)  

  41. Gilbert damping constant for perpendicularly magnetized FePd film detected by using all-optical pump-probe method International conference

    S. Iihama, H. Naganuma, M. Oogane, S. Mizukami, Y. Ando

    International Workshop & School on Spin Transfer  2016.9.19 

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    Language:English   Presentation type:Poster presentation  

    Venue:Nancy, France  

  42. Fast magnetization precession and damping of L10-FePd epitaxial thin films grown on SrTiO3 substrate

    S. Iihama, S. Mizukami, H. Naganuma, T. Miyazaki, M. Oogane, Y. Ando

    IEEE International Conference on Microwave Magnetics 2014  2014.6.29 

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  43. Fast magnetization dynamics for L10-FePd thin films with perpendicular magnetic anisotropy measured by all-optical pump-probe method

    S. Iihama, H. Naganuma, S. Mizukami, T. Miyazaki, M. Khan, M. Oogane, Y. Ando

    2013 Annual Meeting of Excellent Graduate Schools for “Materials Integration Center” and “Materials Science Center”  2014.3.10 

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    Language:Japanese   Presentation type:Poster presentation  

  44. Charge-spin conversion in Pd-Si metallic glass detected by spin-torque ferromagnetic resonance

    Satoshi Iihama

    Spin-RNJ online meeting  2020.4.6 

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    Venue:Online  

  45. Charge-spin conversion in metallic glass detected via spin-torque ferromagnetic resonance International conference

    Satoshi Iihama

    New Perspective in Spin Conversion Science  2020.2.3 

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    Language:English   Presentation type:Poster presentation  

    Venue:Chiba  

  46. All-optical single shot magnetization switching mediated by angular momentum transfer in spin-valve Invited International conference

    Satoshi Iihama

    Tohoku-Lorraine Conference  2019.9.16 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Nancy, France  

  47. All-optical single shot magnetization switching in GdFeCo / Cu / [Co/Pt] spin-valve structure mediated by spin-polarized hot electron transport International conference

    Satoshi Iihama, Yong Xu, Marwan Deb, Gregory Malinowski, Michel Hehn, Jon Gorchon, Eric Fullerton, Stephane Mangin

    Magnetic Single Nano-Object Workshop & School  2018.9.25 

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    Presentation type:Oral presentation (general)  

  48. All-optical single pulse magnetization switching of ferromagnetic [Co/Pt] observed for GdFeCo / Cu / [Co/Pt] spin valve structure

    Satoshi Iihama, Yong Xu, Marwan Deb, Gregory Malinowski, Michel Hehn, Jon Gorchon, Eric Fullerton, Stephane Mangin

    THE JAPAN SOCIETY OF APPLIED PHYSICS  2018.3.17 

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    Language:Japanese   Presentation type:Poster presentation  

    Venue:Waseda University  

  49. All-optical Magnetization Switching Mediated by Laser-induced Spin Current Invited International conference

    Satoshi Iihama

    Purdue-Tohoku Workshop  2019.9.11 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Purdue University  

  50. All-optical magnetization switching in spin-valve structure mediated by spin-polarized hot electron transport International conference

    Satoshi Iihama, Yong Xu, Marwan Deb, Gregory Malinowski, Michel Hehn, Jon Gorchon, Eric Fullerton, Stephane Mangin

    2019 Joint MMM-Intermag Conference  2019.1.14 

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    Presentation type:Oral presentation (general)  

  51. All-optical magnetization switching in [Co/Pt] induced by spin-polarized hot electron transport International conference

    Satoshi Iihama

    One Day Workshop: Nanomagnetism  2018.2.7 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:Nancy, France  

  52. スピンバルブ構造におけるスピン流を介した光誘起磁化反転 Invited

    飯浜賢志

    日本放射光学会 若手研究会  2019.8.22 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  53. The study on spin-orbit torque using metallic disordered atomic structure of metallic glass

    Satoshi Iihama

    The 67th JSAP Spring Meeting, 2020  2020.3.16 

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  54. Terahertz probe of spin-charge conversion using CoFeB films with various capping materials

    Satoshi Iihama, Tomoki Tsuchiya, Yuta Sasaki, Shigemi Mizukami

    2019.3.18 

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    Language:Japanese   Presentation type:Poster presentation  

  55. Terahertz probe of spin-charge conversion in metallic glass

    Satoshi Iihama

    Fusion research presentation in AIMR  2019.11.22 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:AIMR, Tohoku Univ.  

  56. Systematic investigation of precessional magnetization damping for Ta/CoFeB/MgO thin films with perpendicular magnetic anisotropy

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    2013 International Conference on Solid State Devices and Materials  2013.9.23 

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    Language:English   Presentation type:Oral presentation (general)  

  57. Spin-Wave Propagation Detected using All-Optical TR-MOKE Microscope in Permalloy Films

    S. Iihama, S. Mizukami, M. Endo, Y. Sasaki, A. Sugihara, H. Naganuma, M. Oogane, T. Miyazaki, Y. Ando

    第75回応用物理学会秋季学術講演会  2014.9.20 

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  58. Spin-polarized current mediated all-optical single shot magnetization switching

    S. Iihama, Y. Xu, M. Deb, G. Malinowski, M. Hehn, J. Gorchon, E. Fullerton, S. Mangin

    The 2nd Symposium for World Leading Research Centers - Materials Science and Spintronics -  2019.2.15 

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    Language:English   Presentation type:Poster presentation  

  59. Spin-orbit torque generated by disordered atomic structure of metallic glass International conference

    Satoshi Iihama

    The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics  2020.2.10 

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    Language:English   Presentation type:Poster presentation  

    Venue:Sendai  

  60. Spin-current mediated all-optical magnetization switching Invited International conference

    Satoshi Iihama

    FMS-NANOMATA 2019  2019.11.10 

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    Venue:Danang, Vietnum  

  61. Spatially Resolved Pump-probe Magneto-optical Kerr Effect in Permalloy Films

    S. Iihama, Y. Sasaki, Y. Ando, S. Mizukami

    2015 International Conference on Solid State Devices and Materials  2015.9.27 

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  62. Pump-probe法を用いたL10-FePt薄膜のダンピング定数評価

    飯浜賢志, 水上成美, 井波暢人, 平塚喬士, 金国天, 永沼博, 大兼幹彦, 安藤康夫

    第72回応用物理学会秋季学術講演会  2011.8.31 

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  63. Pulse-laser-induced terahertz emission from CoFeB films with various capping layer

    Satoshi Iihama, Tomoki Tsuchiya, Yuta Sasaki, Shigemi Mizukami

    THE JAPAN SOCIETY OF APPLIED PHYSICS  2018.9.18 

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    Language:Japanese   Presentation type:Poster presentation  

  64. Precessional magnetization dynamics for Ta/CoFeB/MgO thin films investigated using all-optical pump-probe detection

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    The 8th International Symposium on Metallic Multilayer  2013.5.9 

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  65. Precessional magnetization damping in Ta/CoFeB/MgO thin films

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    応用物理学会スピントロニクス研究会、第11回スピントロニクス入門セミナー・若手研究会  2012.12.11 

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    Language:Japanese   Presentation type:Poster presentation  

  66. Optical spin-torque observed in FeCo/Pt bilayers

    Satoshi Iihama, Shigemi Mizukami

    The 81st JASP Autumn Meeting 2020  2020.9.10 

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    Venue:Online  

  67. Optical spin torque in ferromagnet/heavy metal thin films Invited

    Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami

    Tohoku-Lorraine Conference  2021.3.3 

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    Language:English   Presentation type:Oral presentation (general)  

  68. Optical detection of precessional magnetization dynamics in Ta/CoFeB/MgO thin films

    S. Iihama, S. Mizukami, Q. L. Ma, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    Advanced Spintronic Materials and Transport Phenomena  2013.7.1 

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  69. Low Gilbert damping observed in L10-FePd thin films with large perpendicular magnetic anisotropy

    S. Iihama, H. Naganuma, M. Oogane, S. Mizukami, Y. Ando

    12th RIEC International Workshop on Spintronics  2014.6.25 

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  70. 高垂直磁気異方性磁性体薄膜における超高速スピン軌道トルク磁化反転の観測

    飯浜賢志

    ATI研究助成2019 成果報告会  2020.11.16 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  71. 高垂直磁気異方性を有するFePd薄膜における磁気緩和定数の評価

    飯浜賢志, 永沼博, 大兼幹彦, 水上成美, 安藤康夫

    高周波スピントロニクス研究会  2014.10.27 

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    Language:Japanese   Presentation type:Poster presentation  

  72. 金属磁性薄膜におけるフェムト秒パルスレーザー励起スピン波伝搬 Invited

    飯浜賢志

    日本磁気学会光機能性デバイス・材料専門研究会  2017.1.20 

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    Presentation type:Oral presentation (invited, special)  

    Venue:日本大学、千葉  

  73. 超短光パルス誘起スピン流を介した全光学的磁気記録 Invited

    飯浜賢志

    スピンデバイス・ストレージ技術専門委員会  2019.8.30 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:横浜国立大学, 神奈川  

  74. 磁性ヘテロ構造薄膜の超高速スピン制御 Invited

    飯浜賢志, 石橋一晃, 水上成美

    第70回応用物理学会春季学術講演会  2023.3.15 

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  75. 強磁性/非磁性/強磁性構造における超高速スピン輸送を用いた全光学的磁化反転 Invited

    飯浜賢志

    東北大学電気通信研究所 共同プロジェクト研究会  2019.2.1 

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    Presentation type:Oral presentation (invited, special)  

  76. 強磁性/重金属ヘテロ構造における円偏光誘起スピントルク Invited

    飯浜賢志

    令和3年東北大学電気通信研究所共同プロジェクト研究会「固体中のスピン・軌道ダイナミクスとその制御」  2021.2.22 

  77. 垂直磁化MgO/CoFeB薄膜におけるダンピング定数の光学的評価

    飯浜賢志, 水上成美, 馬勤礼, 窪田崇秀, 安藤康夫, 宮崎照宜

    第59回応用物理学会秋季学術講演会  2012.9.10 

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  78. 垂直磁化L10-FePd薄膜における低ダンピング定数

    S. Iihama, S. Mizukami, H. Naganuma, T. Miyazaki, M. Oogane, Y. Ando

    第38回日本磁気学会学術講演会  2014.9.2 

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▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 12

  1. Photo-Magnonic Reservoir Computing

    Grant number:JPMJPR22B2  2022.10 - 2026.3

    Japan Science and Technology Agency  PRESTO 

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    Authorship:Principal investigator 

  2. Development of photon-spin interface using surface plasmon resonance in a noble metal/ferromagnet/dielectric structure

    2021.9 - 2023.2

    The Murata Science Foundation 

    Satoshi Iihama

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    Authorship:Principal investigator 

  3. Optical magnetic recording via optical spin torque in a ferromagnet/non-magnet heterostructure

    2021.7 - 2023.6

    The Asahi Glass Foundation 

    Satoshi Iihama

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    Authorship:Principal investigator 

  4. Light-spin coupling in two-dimensional materials

    2021.4 - 2022.3

    東北大学  学際共創プログラム 

    飯浜賢志

  5. Non-linear magnonics in synthetic antiferromagnets

    Grant number:21H04648  2021.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

  6. Observation of ultrafast spin-orbit torque magnetization switching in a material with large perpendicular magnetic anisotropy

    2019.10 - 2020.9

    FOUNDATION ADVANCED TECHNOLOGY INSTITUTE  Advanced Technology Institute Research Grants 2019 

    Satoshi Iihama

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    Authorship:Principal investigator  Grant type:Competitive

  7. Evaluation of perpendicular spin current by using spin-orbit interaction in magnetic material

    2019.4 - 2022.3

    JAPAN SOCIETY FOR THE PROMOTION OF SCIENCE  Grant-in-Aid for Yong Scientists 

    Satoshi Iihama

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    Authorship:Principal investigator  Grant type:Competitive

  8. 原子の磁気モーメントのダイナミクスを利用した超高速磁化反転に関する研究

    2019.4 - 2020.3

    日本科学協会  2019年度笹川科学研究助成 

    飯浜賢志

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    Authorship:Principal investigator  Grant type:Competitive

  9. High throughput strategy toward efficient metallic glass based spintronic THz emitter

    2018.6 - 2019.3

    AIMR, Tohoku University  FY2018 AIMR Fusion research 

    Satoshi Iihama

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    Authorship:Principal investigator  Grant type:Competitive

  10. Study on light-THz wave conversion via spin current

    Grant number:16H03846  2016.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Mizukami Shigemi, SASAKI Yuta

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    We studied a light-terahertz (THz) wave conversion via spin current. Materials studied here were nano-hetero junctions of normal metal / magnetic metal / dielectric insulator, in particular in-plane magnetized Ta/CoFeB/MgO and perpendicularly magnetized CoGa/MnGa/MgO films. Laser-induced THz emission for those samples exhibited significant material dependences, which were explained by the pulse spin current induced by the laser pulse and the conversion of the spin current into the charge current via the inverse spin Hall effect. The analysis on the data suggested that the pulse spin current, namely the THz emission intensity, is governed by the spin polarization of magnetic metals. Furthermore, we discussed an effect of magnon and spin pumping on the observed THz emission.

  11. 高垂直磁気異方性金属薄膜を用いた超高速マグノントランジスタの実証

    2016.4 - 2018.3

    日本学術振興会  科研費 特別研究員奨励費 

    飯浜賢志

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    Authorship:Principal investigator  Grant type:Competitive

  12. Observation of sub-terahertz spin-wave propagation

    2014.4 - 2016.3

    JAPAN SOCIETY FOR THE PROMOTION OF SCIENCE  Grant-in-Aid for JSPS Research Fellow 

    Satoshi Iihama

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    Authorship:Principal investigator  Grant type:Competitive

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Industrial property rights 1

  1. 光磁気メモリインターフェース

    水上成美, 深見俊輔, 新田淳作, 飯浜賢志, 平山祥郎, 境誠司

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    Application no:特願PCT/JP2020/37199  Date applied:2020.9