Faculty Profiles - TANIYAMA Tomoyasu

Papers - TANIYAMA Tomoyasu

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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

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

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

Web of Science

Scopus

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

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

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

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

Publishing type：Research paper (scientific journal)

© 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

Web of Science

Scopus

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

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

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

Web of Science

Scopus

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

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

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

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

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

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

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

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

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

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

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

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

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

Spin Conversion at Magnetic Interfaces Reviewed

Tomoyasu Taniyama

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

Language：English Publishing type：Part of collection (book) Publisher：wiley

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

Scopus

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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Papers - TANIYAMA Tomoyasu