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Masafumi Shirai

Section

Research Institute of Electrical Communication

Job title

Professor

Degree

工学博士（大阪大学）
工学修士（大阪大学）

researchmap

https://researchmap.jp/shirai-masafumi

J-GLOBAL ID

201301073559967520

Research History 1

2002 - Present

Tohoku University　Research Institute of Electrical Communication　Professor

Education 3

Osaka University　Graduate School, Division of Engineering Science　Department of Physical Science

- 1988/03/31
Osaka University　Graduate School, Division of Engineering Science　Department of Physical Science

- 1986/03
Osaka University　Faculty of Engineering Science　Department of Materials Physics

- 1984/03

Committee Memberships 2

The Physical Society of Japan　世話人

2002/11 - 2003/10
日本物理学会半導体分科（領域4）　世話人

2002/11 - 2003/10

Professional Memberships 5

Institute of Electrical and Electronics Engineers
MRS-J
The Magnetics Society of Japan
The Japan Society of Applied Physics
The Physical Society of Japan

Research Interests 30

スピントロニクス
スピンエレクトロニクス
第一原理計算
ハーフメタル
磁気異方性
スピン依存電気伝導
スピン注入
スピン流
強磁性体
ナノ材料
希薄磁性半導体
透明強磁性半導体
ハーフ・メタリック
ヘテロ接合界面
スピンダイナミクス
高スピン偏極強磁性体
マイクロ磁気シミュレーション
電界制御
トンネル磁気抵抗効果
マテリアルデザイン
量子メディア変換
磁気抵抗効果
不揮発性メモリ
半導体人工分子
デバイスデザイン
物質設計
計算物理
相分離
ヘテロ接合
ノンコリニア磁性

Research Areas 7

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electric/electronic material engineering /
Nanotechnology/Materials / Nanobioscience /
Nanotechnology/Materials / Nanomaterials /
Nanotechnology/Materials / Thin-film surfaces and interfaces /
Nanotechnology/Materials / Crystal engineering /
Nanotechnology/Materials / Applied materials /
Nanotechnology/Materials / Structural and functional materials /

Awards 2

第30回日本応用磁気学会学術講演会優秀講演賞

2006/11/22　社団法人日本応用磁気学会　講演題目：ホイスラー合金／MgO磁気トンネル接合におけるスピン依存電気伝導の第一原理計算；講演番号： 14p F-2
第８回（平成３年度）井上研究奨励賞

1992/02/04　財団法人井上科学振興財団　BaPb1-xBixO3とBaxK1-xBiO3の電子－格子相互作用と超伝導

Papers 182

Metastable body-centered cubic CoMnFe alloy films with perpendicular magnetic anisotropy for spintronics memory

Deepak Kumar, Mio Ishibashi, Tufan Roy, Masahito Tsujikawa, Masafumi Shirai, Shigemi Mizukami

Science and Technology of Advanced Materials　2024/11/13
Publisher: Informa UK Limited
DOI： 10.1080/14686996.2024.2421746 　

ISSN： 1468-6996

eISSN： 1878-5514
Ballistic spin-transport properties of magnetic tunnel junctions with MnCr-based ferrimagnetic quaternary Heusler alloys

Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

Physical Review Materials　7　(10)　2023/10/25
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevmaterials.7.104410 　

eISSN： 2475-9953
Fabrication of L10-ordered FeNi films by denitriding FeNiN(001) and FeNiN(110) films

Keita Ito, Takumi Ichimura, Masahiro Hayashida, Takahiro Nishio, Sho Goto, Hiroaki Kura, Ryusei Sasaki, Masahito Tsujikawa, Masafumi Shirai, Tomoyuki Koganezawa, Masaki Mizuguchi, Yusuke Shimada, Toyohiko J. Konno, Hideto Yanagihara, Koki Takanashi

Journal of Alloys and Compounds　946　169450-169450　2023/06
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2023.169450 　

ISSN： 0925-8388
Anisotropic magnetism and electronic structure of trigonal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuAl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> single crystals

Santanu Pakhira, Asish K. Kundu, Farhan Islam, M. A. Tanatar, Tufan Roy, Thomas Heitmann, T. Yilmaz, E. Vescovo, Masahito Tsujikawa, Masafumi Shirai, R. Prozorov, David Vaknin, D. C. Johnston

Physical Review B　107　(13)　2023/04/28
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.107.134439 　

ISSN： 2469-9950

eISSN： 2469-9969
Anomalous Nernst effect in epitaxially grown Fe4-xNixN films

Weida Yin, Keita Ito, Yusuke Tsubowa, Masahito Tsujikawa, Masafumi Shirai, Koki Takanashi

AIP ADVANCES　13　(2)　2023/02

DOI： 10.1063/9.0000564 　

eISSN： 2158-3226
Electronic and magnetic properties of the topological semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SmMg</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Asish K. Kundu, Santanu Pakhira, Tufan Roy, T. Yilmaz, Masahito Tsujikawa, Masafumi Shirai, E. Vescovo, D. C. Johnston, Abhay N. Pasupathy, Tonica Valla

Physical Review B　106　(24)　2022/12/19
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.106.245131 　

ISSN： 2469-9950

eISSN： 2469-9969
Compositional dependence of anisotropic magnetoresistance effects in Weyl semimetal Co2MnAl Heusler alloy epitaxial thin films Peer-reviewed

T. Sato, S. Kokado, H. Shinya, M. Tsujikawa, A. Miura, S. Kosaka, T. Ogawa, M. Shirai, M. Tsunoda

Journal of Applied Physics　132　(22)　223907-1-223907-7　2022/12/12
Publisher: AIP Publishing
DOI： 10.1063/5.0128562 　

ISSN： 0021-8979

eISSN： 1089-7550

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Anisotropic magnetoresistance (AMR) effect on a Weyl semimetal Co₂MnAl Heusler alloy was experimentally and theoretically investigated by changing the Co content, the direction of electric current against the crystal axis, and the measurement temperature. The experimentally fabricated Co₂MnAl thin films epitaxially grown on a MgO single-crystal substrate showed the positive AMR ratios independent of the Co content, the direction of electric current, and the measurement temperature. The AMR ratios for the direction of electric current along Co₂MnAl[100] were larger than those along Co₂MnAl[110]. The maximum AMR ratios for Co₂MnAl[100] were 0.576% at 5 K and 0.349% at 300 K for a Co content of 47 at. %, which is close to the stoichiometric composition. Furthermore, the theoretical calculations of AMR ratios based on the s-d scattering process of the electrons at the Fermi energy, including the information on the density of states (DOS) obtained from first-principles calculations, exhibited trends similar to the experimental results. Compared with the AMR results of Co₂MnGa[110], we found that the magnitude relation between the partial DOS of the ε and γ orbitals of the d state of Co atoms determined the sign of the AMR ratios. These results suggest that the AMR effect of Weyl semimetal Co₂MnAl can be elucidated by the s-d scattering process of the electrons.
Topological electronic structure of YbMg2Bi2 and CaMg2Bi2

Asish K. Kundu, Tufan Roy, Santanu Pakhira, Ze-Bin Wu, Masahito Tsujikawa, Masafumi Shirai, D. C. Johnston, Abhay N. Pasupathy, Tonica Valla

npj Quantum Materials　7　(1)　2022/06/23
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41535-022-00474-2 　

eISSN： 2397-4648

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Abstract Zintl compounds have been extensively studied for their outstanding thermoelectric properties, but their electronic structure remains largely unexplored. Here, we present a detailed investigation of the electronic structure of the isostructural thermopower materials YbMg₂Bi₂ and CaMg₂Bi₂ using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). The ARPES results show a significantly smaller Fermi surface and Fermi velocity in CaMg₂Bi₂ than in YbMg₂Bi₂. Our ARPES results also reveal that in the case of YbMg₂Bi₂, Yb-4f states reside well below the Fermi level and likely have a negligible impact on transport properties. To properly model the position of 4f-states, as well as the overall electronic structure, a Hubbard U at the Yb sites and spin-orbit coupling (SOC) have to be included in the DFT calculations. The theoretical results reveal that both materials belong to a Z₂ topological class and host topological surface states around E_F. Due to the intrinsic hole doping, the topological states reside above the Fermi level, inaccessible by ARPES. Our results also suggest that in addition to SOC, vacancies and the resulting hole doping play an important role in the transport properties of these materials.
Electron Correlation Enhances Orbital Polarization at a Ferromagnetic Metal/Insulator Interface: Depth-Resolved X-ray Magnetic Circular Dichroism and First-Principles Study

Shoya Sakamoto, Masahito Tsujikawa, Masafumi Shirai, Kenta Amemiya, Shinji Miwa

ACS Applied Electronic Materials　4　(4)　1794-1799　2022/04

DOI： 10.1021/acsaelm.2c00049 　

eISSN： 2637-6113
Structure and magnetism in metastable bcc Co1−xMnx epitaxial films

Kazuma Kunimatsu, Tufan Roy, Jun Okabayashi, Tomoki Tsuchiya, Tomohiro Ichinose, Masahito Tsujikawa, Masafumi Shirai, Shigemi Mizukami

Journal of Magnetism and Magnetic Materials　548　168841-168841　2022/04
Publisher: Elsevier BV
DOI： 10.1016/j.jmmm.2021.168841 　

ISSN： 0304-8853
Synthesis and magnetic properties of tetragonally ordered Fe2Ni2N alloy using topotactic nitriding reaction

Sho Goto, Hiroaki Kura, Masahito Tsujikawa, Masafumi Shirai, Keita Ito, Takashi Suemasu, Koki Takanashi, Hideto Yanagihara

JOURNAL OF ALLOYS AND COMPOUNDS　885　2021/12

DOI： 10.1016/j.jallcom.2021.161122 　

ISSN： 0925-8388

eISSN： 1873-4669
Lattice Softening in Metastable bcc CoxMn100−x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction

Kevin Elphick, Kenta Yoshida, Tufan Roy, Tomohiro Ichinose, Kazuma Kunimatsu, Tomoki Tsuchiya, Kazuya Z. Suzuki, Masahito Tsujikawa, Yasuyoshi Nagai, Shigemi Mizukami, Masafumi Shirai, Atsufumi Hirohata

Physical Review Applied　16　(5)　2021/11/30
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevapplied.16.054052 　

eISSN： 2331-7019
IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions:A ﬁrst-principles study

Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

Journal of Physics D: Applied Physics　2021/11/26
Publisher: IOP Publishing
DOI： 10.1088/1361-6463/ac3dab 　

ISSN： 0022-3727

eISSN： 1361-6463

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<title>Abstract</title> We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles calculations from the perspective of their application as the electrode materials of MgO-based MTJs. These materials have highly spin-polarized conduction electrons with partially occupied Δ₁ band, which is important for coherent tunneling in parallel magnetization configuration. The Curie temperatures of IrCrMnAl and IrCrMnGa are very high (above 1300 K) as predicted from mean-field-approximation. The stability of ordered phase against various antisite disorders has been investigated. We discuss here the effect of ``spin-orbit-coupling'' on the electronic structure around Fermi level. Further, we investigate the electronic structure of IrCrMnZ/MgO heterojunction along (001) direction. IrCrMnAl/MgO and IrCrMnGa/MgO maintain half-metallicity even at the MgO interface, with no interfacial states at/around Fermi level in the minority-spin channel. Large majority-spin conductance of IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa is reported from the calculation of ballistic spin-transport property for parallel magnetization configuration. We propose IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa as promising MTJs with a weaker temperature dependence of tunneling magnetoresistance ratio, owing to their very high Curie temperatures.
Structural and magnetic properties of CoIrMnAl equiatomic quaternary Heusler alloy epitaxial films designed using first-principles calculations

Ren Monma, Tufan Roy, Kazuya Suzuki, Tomoki Tsuchiya, Masahito Tsujikawa, Shigemi Mizukami, Masafumi Shirai

JOURNAL OF ALLOYS AND COMPOUNDS　868　2021/07

DOI： 10.1016/j.jallcom.2021.159175 　

ISSN： 0925-8388

eISSN： 1873-4669
Ab initio study of electronic and magnetic properties of Mn(2)RuZ/MgO (001) heterojunctions (Z = Al, Ge)

Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

JOURNAL OF PHYSICS-CONDENSED MATTER　33　(14)　2021/04

DOI： 10.1088/1361-648X/abdffc 　

ISSN： 0953-8984

eISSN： 1361-648X
Enhancement of the anomalous Nernst effect in Ni/Pt superlattices

T. Seki, Y. Sakuraba, K. Masuda, A. Miura, M. Tsujikawa, K. Uchida, T. Kubota, Y. Miura, M. Shirai, K. Takanashi

Physical Review B　103　(2)　2021/01/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.103.l020402 　

ISSN： 2469-9950

eISSN： 2469-9969
Magnetic tunnel junctions with metastable bcc Co3Mn electrodes Peer-reviewed

Kazuma Kunimatsu, Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick, Tomohiro Ichinose, Masahito TSUJIKAWA, Atsufumi HIROHATA, Masafumi Shirai, Shigemi Mizukami

Applied Physics Express　2020/07/22
Publisher: IOP Publishing
DOI： 10.35848/1882-0786/aba883 　

ISSN： 1882-0778

eISSN： 1882-0786
Perpendicularly magnetized Ni/Pt (001) epitaxial superlattice

T. Seki, M. Tsujikawa, K. Ito, K. Uchida, H. Kurebayashi, M. Shirai, K. Takanashi

PHYSICAL REVIEW MATERIALS　4　(6)　2020/06

DOI： 10.1103/PhysRevMaterials.4.064413 　

ISSN： 2475-9953
Experimental inspection of a computationally-designed NiCrMnSi Heusler alloy with high Curie temperature Peer-reviewed

Yuta Onodera, Kelvin Elphick, Takuro Kanemura, Tufan Roy, Tomoki Tsuchiya, Masahito Tsujikawa, Kenta Yoshida, Yasuyoshi Nagai, Shigemi Mizukami, Atsufumi Hirohata, Masafumi Shirai

Japanese Journal of Applied Physics (accepted)　59　(7)　073003-073003　2020/06
Publisher: IOP Publishing
DOI： 10.35848/1347-4065/ab9c75 　

ISSN： 0021-4922

eISSN： 1347-4065
Theoretical design of tetragonal rare-earth-free alloys with high magnetisation and high magnetic anisotropy

Masahito Tsujikawa, Yuito Mitsuhashi, Masafumi Shirai

Japanese Journal of Applied Physics　59　(5)　2020/05/07
Publisher: Institute of Physics Publishing
DOI： 10.35848/1347-4065/ab87dd 　

ISSN： 1347-4065 0021-4922
Off-stoichiometry effect on magnetic damping in thin films of Heusler alloy Co2MnSi

Ting Li, Wei Yan, Xinhui Zhang, Bing Hu, Kidist Moges, Tetsuya Uemura, Masafumi Yamamoto, Masahito Tsujikawa, Masafumi Shirai, Yoshio Miura

Physical Review B　101　(17)　2020/05/06
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.101.174410 　

ISSN： 2469-9950

eISSN： 2469-9969
Ab-initio study of electronic and magnetic properties of CoIrMnZ (Z= Al, Si, Ga, Ge) Heusler alloys

Tufan Roy, Masahito Tsujikawa, Takuro Kanemura, Masafumi Shirai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　498　2020/03

DOI： 10.1016/j.jmmm.2019.166092 　

ISSN： 0304-8853

eISSN： 1873-4766
Voltage-controlled magnetic anisotropy in an ultrathin Ir-doped Fe layer with a CoFe termination layer

Takayuki Nozaki, Masaki Endo, Masahito Tsujikawa, Tatsuya Yamamoto, Tomohiro Nozaki, Makoto Konoto, Hiroyuki Ohmori, Yutaka Higo, Hitoshi Kubota, Akio Fukushima, Masanori Hosomi, Masafumi Shirai, Yoshishige Suzuki, Shinji Yuasa

APL MATERIALS　8　(1)　2020/01

DOI： 10.1063/1.5132626 　

ISSN： 2166-532X
Positive Weiss Temperature in Layered Antiferromagnetic FeNiN for High-Performance Permanent Magnets

Sho Goto, Hiroaki Kura, Hideto Yanagihara, Eiji Kita, Masahito Tsujikawa, Ryusei Sasaki, Masafumi Shirai, Yasuhiro Kobayashi, Takashi Honda, Kanta Ono

ACS Applied Nano Materials　2　(11)　6909-6917　2019/11/22
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acsanm.9b01405 　

ISSN： 2574-0970

eISSN： 2574-0970
Signs of anisotropic magnetoresistance in Co2MnGa Heusler alloy epitaxial thin films based on current direction Peer-reviewed

Takashi Sato, Satoshi Kokado, Masahito Tsujikawa, Tomoyuki Ogawa, Satoru Kosaka, Masafumi Shirai, Masakiyo Tsunoda

Applied Physics Express　12　(10)　103005-1　2019/09

DOI： 10.7567/1882-0786/ab42b4 　
Microscopic origin of large perpendicular magnetic anisotropy in an FeIr/MgO system Peer-reviewed

Shinji Miwa, Takayuki Nozaki, Masahito Tsujikawa, Motohiro Suzuki, Takuya Tsukahara, Takeshi Kawabe, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

Physical Review B　99　(18)　2019/05/16
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.99.184421 　

ISSN： 2469-9950

eISSN： 2469-9969
Recent Progress in the Voltage-Controlled Magnetic Anisotropy Effect and the Challenges Faced in Developing Voltage-Torque MRAM. Peer-reviewed

Nozaki T, Yamamoto T, Miwa S, Tsujikawa M, Shirai M, Yuasa S, Suzuki Y

Micromachines　10　(5)　2019/05

DOI： 10.3390/mi10050327 　

ISSN： 2072-666X
Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change Peer-reviewed

Y. Jibiki, M. Goto, M. Tsujikawa, P. Risius, S. Hasebe, X. Xu, K. Nawaoka, T. Ohkubo, K. Hono, M. Shirai, S. Miwa, Y. Suzuki

Applied Physics Letters　114　(8)　082405-1-082405-5　2019/03

DOI： 10.1063/1.5082254 　

ISSN： 0003-6951
Atomic ordering, magnetic properties, and electronic structure of Mn2CoGa Heusler alloy Peer-reviewed

Umetsu Rie Y, Tsujikawa Masato, Saito Kotaro, Ono Kanta, Ishigaki Toru, Kainuma Ryosuke, Shirai Masafumi

JOURNAL OF PHYSICS-CONDENSED MATTER　31　(6)　2019/02/13

DOI： 10.1088/1361-648X/aaf54a 　

ISSN： 0953-8984

eISSN： 1361-648X
Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy Peer-reviewed

Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick, Jun Okabayashi, Lakhan Bainsla, Tomohiro Ichinose, Kazuya Z. Suzuki, Masahito Tsujikawa, Masafumi Shirai, Atsufumi Hirohata, Shigemi Mizukami

Physical Review Materials　3　(8)　084403　2019

DOI： 10.1103/PhysRevMaterials.3.084403 　

ISSN： 2475-9953
Perpendicular magnetic anisotropy and its electric-field-induced change at metal-dielectric interfaces Peer-reviewed

Miwa Shinji, Suzuki Motohiro, Tsujikawa Masahito, Nozaki Takayuki, Nakamura Tetsuya, Shirai Masafumi, Yuasa Shinji, Suzuki Yoshishige

Journal of Physics D-Applied Physics　52　(6)　2019

DOI： 10.1088/1361-6463/aaef18 　

ISSN： 0022-3727

eISSN： 1361-6463
Electronic structures of MgO/Fe interfaces with perpendicular magnetization revealed by hard X-ray photoemission with an applied magnetic field Peer-reviewed

S. Ueda, M. Mizuguchi, M. Tsujikawa, M. Shirai

Science and Technology of Advanced Materials　2019

DOI： 10.1080/14686996.2019.1633687 　
Low magnetic damping for equiatomic CoFeMnSi Heusler alloy Peer-reviewed

L. Bainsla, R. Yilgin, M.Tsujikawa, K. Z. Suzuki, M. Shirai, S. Mizukami

Journal of Physics D: Applied Physics　51　(49)　495001　2018/12

DOI： 10.1088/1361-6463/aae4ef 　

ISSN： 0022-3727
Pressure effect on the magnetic properties of the half-metallic Heusler alloy Co2TiSn Peer-reviewed

Iduru Shigeta, Yutaro Fujimoto, Ryutaro Ooka, Yuya Nishisako, Masahito Tsujikawa, Rie Y. Umetsu, Akiko Nomura, Kunio Yubuta, Yoshio Miura, Takeshi Kanomata, Masafumi Shirai, Jun Gouchi, Yoshiya Uwatoko, Masahiko Hiroi

Physical Review B　97　(10)　4414/1-104414/8　2018/03/21
Publisher: American Physical Society
DOI： 10.1103/PhysRevB.97.104414 　

ISSN： 2469-9969 2469-9950

eISSN： 2469-9969
Magnetic tunnel junctions with an equiatomic quaternary CoFeMnSi Heusler alloy electrode Peer-reviewed

Lakhan Bainsla, Kazuya Z. Suzuki, Masahito Tsujikawa, Hiroki Tsuchiura, Masafumi Shirai, Shigemi Mizukami

Applied Physics Letters　112　(5)　052403/1-52403/5　2018/01/29
Publisher: American Institute of Physics Inc.
DOI： 10.1063/1.5002763 　

ISSN： 0003-6951
Synthesis of metastable B2-type Fe-Sn alloy epitaxial films and study of their magnetic properties Peer-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　57　(12)　2018

DOI： 10.7567/JJAP.57.120302 　
Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films Peer-reviewed

Takeshi Kawabe, Kohei Yoshikawa, Masahito Tsujikawa, Takuya Tsukahara, Kohei Nawaoka, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Motohiro Suzuki, Tetsuya Nakamura, Masafumi Shirai, Yoshishige Suzuki, Shinji Miwa

Physical Review B　96　(22)　220412(R)/1-0412(R)/6　2017/12/26
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.96.220412 　

ISSN： 2469-9950

eISSN： 2469-9969
Highly efficient voltage control of spin and enhanced interfacial perpendicular magnetic anisotropy in iridium-doped Fe/MgO magnetic tunnel junctions Peer-reviewed

Takayuki Nozaki, Anna Koziol-Rachwal, Masahito Tsujikawa, Yoichi Shiota, Xiandong Xu, Tadakatsu Ohkubo, Takuya Tsukahara, Shinji Miwa, Motohiro Suzuki, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Kazuhiro Hono, Masafumi Shirai, Yoshishige Suzuki, Shinji Yuasa

NPG ASIA MATERIALS　9　e451/1-e451/10　2017/12

DOI： 10.1038/am.2017.204 　

ISSN： 1884-4049

eISSN： 1884-4057
Emergence of undulating surface band upon oxygen adsorption of Fe thin flim on W(110) Peer-reviewed

Seigo Souma, Kohei Honma, Takafumi Sato, Masahito Tsujikawa, Masafumi Shirai, Takashi Takahashi

APPLIED PHYSICS LETTERS　111　(24)　241603/1-241603/4　2017/12

DOI： 10.1063/1.5017484 　

ISSN： 0003-6951

eISSN： 1077-3118
Magnetic Anisotropy and Damping for Monolayer-Controlled Co | Ni Epitaxial Multilayer Peer-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　86　(7)　074710/1-074710/10　2017/07

DOI： 10.7566/JPSJ.86.074710 　

ISSN： 0031-9015
Voltage controlled interfacial magnetism through platinum orbits Peer-reviewed

Shinji Miwa, Motohiro Suzuki, Masahito Tsujikawa, Kensho Matsuda, Takayuki Nozaki, Kazuhito Tanaka, Takuya Tsukahara, Kohei Nawaoka, Minori Goto, Yoshinori Kotani, Tadakatsu Ohkubo, Frederic Bonell, Eiiti Tamura, Kazuhiro Hono, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

NATURE COMMUNICATIONS　8　15848/1-15848/9　2017/06

DOI： 10.1038/ncomms15848 　

ISSN： 2041-1723
Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism Peer-reviewed

Jun Okabayashi, Tomohiro Koyama, Motohiro Suzuki, Masahito Tsujikawa, Masafumi Shirai, Daichi Chiba

SCIENTIFIC REPORTS　7　46132/1-46132/9　2017/04

DOI： 10.1038/srep46132 　

ISSN： 2045-2322
Current perpendicular-to-plane giant magnetoresistance devices using half-metallic Co2Fe0.4Mn0.6Si electrodes and a Ag-Mg spacer Peer-reviewed

T. Kubota, Y. Ina, M. Tsujikawa, S. Morikawa, H. Narisawa, Z. Wen, M. Shirai, K. Takanashi

JOURNAL OF PHYSICS D-APPLIED PHYSICS　50　(1)　014004/1-014004/8　2017/01

DOI： 10.1088/1361-6463/50/1/014004 　

ISSN： 0022-3727

eISSN： 1361-6463
Temperature dependence of spin-dependent tunneling conductance of magnetic tunnel junctions with half-metallic Co2MnSi electrodes Peer-reviewed

Bing Hu, Kidist Moges, Yusuke Honda, Hong-xi Liu, Tetsuya Uemura, Masafumi Yamamoto, Jun-ichiro Inoue, Masafumi Shirai

PHYSICAL REVIEW B　94　(9)　094428/1-094428/15　2016/09

DOI： 10.1103/PhysRevB.94.094428 　

ISSN： 2469-9950

eISSN： 2469-9969
Electronic structure and magnetic anisotropy of L1(o)-FePt thin film studied by hard x-ray photoemission spectroscopy and first-principles calculations Peer-reviewed

S. Ueda, M. Mizuguchi, Y. Miura, J. G. Kang, M. Shirai, K. Takanashi

APPLIED PHYSICS LETTERS　109　(4)　042404/1-042404/5　2016/07

DOI： 10.1063/1.4959957 　

ISSN： 0003-6951

eISSN： 1077-3118
Enhanced half-metallicity of off-stoichiometric quaternary Heusler alloy Co-2(Mn, Fe)Si investigated through saturation magnetization and tunneling magnetoresistance Peer-reviewed

Kidist Moges, Yusuke Honda, Hong-xi Liu, Tetsuya Uemura, Masafumi Yamamoto, Yoshio Miura, Masafumi Shirai

PHYSICAL REVIEW B　93　(13)　134403/1-134403/15　2016/04

DOI： 10.1103/PhysRevB.93.134403 　

ISSN： 2469-9950

eISSN： 2469-9969
20pAU-2 First-principles calculation of spin-dependent transport in Co_2MnSi/Ag-Mg/Co_2MnSi GMR devices

Morikawa S., Tsujikawa M., Abe K., Shirai M.

Meeting Abstracts of the Physical Society of Japan　71　1184-1184　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1184 　

ISSN： 2189-079X
19aPS-11 Atomic arrangement and electronic state of Mn_2CoGa Heusler alloy

Umetsu R.Y., Saito K., Tsujikawa M., Ono K., Ishigaki T., Shirai M.

Meeting Abstracts of the Physical Society of Japan　71　1018-1018　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1018 　

ISSN： 2189-079X
Drastic change in density of states upon martensitic phase transition for metamagnetic shape memory alloy Ni2Mn1+xIn1-x Peer-reviewed

Siyuan Zhu, Mao Ye, Kaito Shirai, Masaki Taniguchi, Shigenori Ueda, Yoshio Miura, Masafumi Shirai, Rie Yamauchi Umetsu, Ryosuke Kainuma, Takeshi Kanomata, Akio Kimura

JOURNAL OF PHYSICS-CONDENSED MATTER　27　(36)　362201/1-362201/6　2015/09

DOI： 10.1088/0953-8984/27/36/362201 　

ISSN： 0953-8984

eISSN： 1361-648X
Electronic and magnetic properties of off-stoichiometric Co2Mn beta Si/MgO interfaces studied by x-ray magnetic circular dichroism Peer-reviewed

V. R. Singh, V. K. Verma, K. Ishigami, G. Shibata, A. Fujimori, T. Koide, Y. Miura, M. Shirai, T. Ishikawa, G. -f. Li, M. Yamamoto

JOURNAL OF APPLIED PHYSICS　117　(20)　203901/1-203901/6　2015/05

DOI： 10.1063/1.4921538 　

ISSN： 0021-8979

eISSN： 1089-7550
19aCG-2 Oxygen adsorption effect on surface electronic band structure in Fe(110) thin film : High-resolution ARPES

Souma S., Honma K., Sugawara K., Sato T., Tsujikawa M., Shirai M., Takahashi T.

Meeting Abstracts of the Physical Society of Japan　70　967-967　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_967 　

ISSN： 2189-079X
Magnetic anisotropy in Ta/CoFeB/MgO investigated by x-ray magnetic circular dichroism and first-principles calculation Peer-reviewed

Shun Kanai, Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai, Fumihiro Matsukura, Hideo Ohno

APPLIED PHYSICS LETTERS　105　(22)　222409/1-222409/4　2014/12

DOI： 10.1063/1.4903296 　

ISSN： 0003-6951

eISSN： 1077-3118
Magnetic properties of Ni2N Peer-reviewed

H. Nishihara, K. Suzuki, R. Y. Umetsu, T. Kanomata, T. Kaneko, M. Y. Zhou, M. Tsujikawa, M. Shirai, T. Sakon, T. Wada, K. Terashima, S. Imada

PHYSICA B-CONDENSED MATTER　449　85-89　2014/09

DOI： 10.1016/j.physb.2014.05.016 　

ISSN： 0921-4526

eISSN： 1873-2135
Detection of spin-resolved electronic structures from a buried ferromagnetic layer utilizing forward Mott scattering Peer-reviewed

S. Ueda, M. Mizuguchi, T. Kojima, S. Ishimaru, M. Tsujikawa, M. Shirai, K. Takanashi

APPLIED PHYSICS LETTERS　104　(13)　132402/1-132402/5　2014/03

DOI： 10.1063/1.4868248 　

ISSN： 0003-6951

eISSN： 1077-3118
Effect of nonstoichiometry on the half-metallic character of Co2 MnSi investigated through saturation magnetization and tunneling magnetoresistance ratio Peer-reviewed

Gui-Fang Li, Yusuke Honda, Hong-Xi Liu, Ken-Ichi Matsuda, Masashi Arita, Tetsuya Uemura, Masafumi Yamamoto, Yoshio Miura, Masafumi Shirai, Toshiaki Saito, Fengyuan Shi, Paul M. Voyles

Physical Review B - Condensed Matter and Materials Physics　89　(1)　2014/01/30

DOI： 10.1103/PhysRevB.89.014428 　

ISSN： 1098-0121 1550-235X
Effect of nonstoichiometry on the half-metallic character of Co2MnSi investigated through saturation magnetization and tunneling magnetoresistance ratio Peer-reviewed

Gui-fang Li, Yusuke Honda, Hong-xi Liu, Ken-ichi Matsuda, Masashi Arita, Tetsuya Uemura, Masafumi Yamamoto, Yoshio Miura, Masafumi Shirai, Toshiaki Saito, Fengyuan Shi, Paul M. Voyles

PHYSICAL REVIEW B　89　(1)　014428/1-014428/14　2014/01

DOI： 10.1103/PhysRevB.89.014428 　

ISSN： 2469-9950

eISSN： 2469-9969
Theoretical Study on Tunneling Magnetoresistance of Magnetic Tunnel Tunctions with D0(22)-Mn(3)Z (Z = Ga, Ge) Peer-reviewed

Yoshio Miura, Masafumi Shirai

IEEE TRANSACTIONS ON MAGNETICS　50　(1)　1400504/1-1400504/4　2014/01

DOI： 10.1109/TMAG.2013.2276625 　

ISSN： 0018-9464

eISSN： 1941-0069
A first-principles study on magnetocrystalline anisotropy at interfaces of Fe with non-magnetic metals Peer-reviewed

Yoshio Miura, Masahito Tsujikawa, Masafumi Shirai

JOURNAL OF APPLIED PHYSICS　113　(23)　233908/1-233908/6　2013/06

DOI： 10.1063/1.4811685 　

ISSN： 0021-8979
The origin of perpendicular magneto-crystalline anisotropy in L1(0)-FeNi under tetragonal distortion Peer-reviewed

Yoshio Miura, Sho Ozaki, Yasushi Kuwahara, Masahito Tsujikawa, Kazutaka Abe, Masafumi Shirai

JOURNAL OF PHYSICS-CONDENSED MATTER　25　(10)　106005/1-106005/9　2013/03

DOI： 10.1088/0953-8984/25/10/106005 　

ISSN： 0953-8984

eISSN： 1361-648X
Extensive study of giant magnetoresistance properties in half-metallic Co-2(Fe,Mn)Si-based devices Peer-reviewed

Y. Sakuraba, M. Ueda, Y. Miura, K. Sato, S. Bosu, K. Saito, M. Shirai, T. J. Konno, K. Takanashi

APPLIED PHYSICS LETTERS　101　(25)　252408/1-252408/4　2012/12

DOI： 10.1063/1.4772546 　

ISSN： 0003-6951
Enhanced tunnel magnetoresistance in a spinel oxide barrier with cation site disorder Peer-reviewed

Hiroaki Sukegawa, Yoshio Miura, Shingo Muramoto, Seiji Mitani, Tomohiko Niizeki, Tadakatsu Ohkubo, Kazutaka Abe, Masafumi Shirai, Koichiro Inomata, Kazuhiro Hono

Physical Review B　86　(18)　184401/1-184401/5　2012/11/02

DOI： 10.1103/PhysRevB.86.184401 　
Effects of off-stoichiometry on the spin polarization at the Co2Mn beta Ge0.38/MgO interfaces: X-ray magnetic circular dichroism study Peer-reviewed

V. R. Singh, V. K. Verma, K. Ishigami, G. Shibata, T. Kadono, A. Fujimori, D. Asakura, T. Koide, Y. Miura, M. Shirai, G. -F. Li, T. Taira, M. Yamamoto

PHYSICAL REVIEW B　86　(14)　144412/1-144412/6　2012/10

DOI： 10.1103/PhysRevB.86.144412 　

ISSN： 2469-9950

eISSN： 2469-9969
First-principles study of tunneling magnetoresistance in Fe/MgAl 2O 4/Fe(001) magnetic tunnel junctions Peer-reviewed

Yoshio Miura, Shingo Muramoto, Kazutaka Abe, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　86　(2)　2012/07/20

DOI： 10.1103/PhysRevB.86.024426 　

ISSN： 1098-0121 1550-235X
First-principles study of tunneling magnetoresistance in Fe/MgAl2O4/Fe(001) magnetic tunnel junctions Peer-reviewed

Yoshio Miura, Shingo Muramoto, Kazutaka Abe, Masafumi Shirai

PHYSICAL REVIEW B　86　(2)　024426/1-024426/6　2012/07

DOI： 10.1103/PhysRevB.86.024426 　

ISSN： 2469-9950

eISSN： 2469-9969
First-principles study of ballistic transport properties in Co 2MnSi/X/Co2MnSi(001) (X= Ag, Au, Al, V, Cr) trilayers Peer-reviewed

Yoshio Miura, Koichi Futatsukawa, Shohei Nakajima, Kazutaka Abe, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　84　(13)　2011/10/20

DOI： 10.1103/PhysRevB.84.134432 　

ISSN： 1098-0121 1550-235X
First-principles study of ballistic transport properties in Co2MnSi/X/Co2MnSi(001) (X = Ag, Au, Al, V, Cr) trilayers Peer-reviewed

Yoshio Miura, Koichi Futatsukawa, Shohei Nakajima, Kazutaka Abe, Masafumi Shirai

PHYSICAL REVIEW B　84　(13)　134432/1-134432/6　2011/10

DOI： 10.1103/PhysRevB.84.134432 　

ISSN： 2469-9950

eISSN： 2469-9969
Effects of interfacial noncollinear magnetic structures on spin-dependent conductance in Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions: A first-principles study Peer-reviewed

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　83　(21)　2011/06/13

DOI： 10.1103/PhysRevB.83.214411 　

ISSN： 1098-0121 1550-235X
Effects of interfacial noncollinear magnetic structures on spin-dependent conductance in Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions: A first-principles study Peer-reviewed

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

PHYSICAL REVIEW B　83　(21)　214411/1-214411/6　2011/06

DOI： 10.1103/PhysRevB.83.214411 　

ISSN： 2469-9950

eISSN： 2469-9969
Magnetoresistance Effect in Tunnel Junctions with Perpendicularly Magnetized D0(22)-Mn3-delta Ga Electrode and MgO Barrier Peer-reviewed

Takahide Kubota, Yoshio Miura, Daisuke Watanabe, Shigemi Mizukami, Feng Wu, Hiroshi Naganuma, Xianmin Zhang, Mikihiko Oogane, Masafumi Shirai, Yasuo Ando, Terunobu Miyazaki

APPLIED PHYSICS EXPRESS　4　(4)　043002/1-043002/3　2011/04

DOI： 10.1143/APEX.4.043002 　

ISSN： 1882-0778
A comparative ab initio study on electric-field dependence of magnetic anisotropy in MgO/Fe/Pt and MgO/Fe/Au films Peer-reviewed

M. Tsujikawa, S. Haraguchi, T. Oda, Y. Miura, M. Shirai

JOURNAL OF APPLIED PHYSICS　109　(7)　07C107/1-07C107/3　2011/04

DOI： 10.1063/1.3540677 　

ISSN： 0021-8979
Magnetic properties of the half-metallic Heusler alloys Co2VAl and Co2VGa under pressure Peer-reviewed

T. Kanomata, Y. Chieda, K. Endo, H. Okada, M. Nagasako, K. Kobayashi, R. Kainuma, R. Y. Umetsu, H. Takahashi, Y. Furutani, H. Nishihara, K. Abe, Y. Miura, M. Shirai

PHYSICAL REVIEW B　82　(14)　144415/1-144415/7　2010/10

DOI： 10.1103/PhysRevB.82.144415 　

ISSN： 1098-0121
Mechanism of large magnetoresistance in Co2MnSi/Ag/Co2MnSi devices with current perpendicular to the plane Peer-reviewed

Y. Sakuraba, K. Izumi, T. Iwase, S. Bosu, K. Saito, K. Takanashi, Y. Miura, K. Futatsukawa, K. Abe, M. Shirai

PHYSICAL REVIEW B　82　(9)　094444/1-094444/5　2010/09

DOI： 10.1103/PhysRevB.82.094444 　

ISSN： 2469-9950

eISSN： 2469-9969
Interface structure of half-metallic Heusler alloy Co2MnSi thin films facing an MgO tunnel barrier determined by x-ray magnetic circular dichroism Peer-reviewed

Toshiaki Saito, Toshikazu Katayama, Takayuki Ishikawa, Masafumi Yamamoto, Daisuke Asakura, Tsuneharu Koide, Yoshio Miura, Masafumi Shirai

PHYSICAL REVIEW B　81　(14)　144417-1-144417-6　2010/04

DOI： 10.1103/PhysRevB.81.144417 　

ISSN： 2469-9950

eISSN： 2469-9969
Role of Electronic Structure in the Martensitic Phase Transition of Ni2Mn1-xSn1-x Studied by Hard-X-Ray Photoelectron Spectroscopy and Ab Initio Calculation Peer-reviewed

M. Ye, A. Kimura, Y. Miura, M. Shirai, Y. T. Cui, K. Shimada, H. Namatame, M. Taniguchi, S. Ueda, K. Kobayashi, R. Kainuma, T. Shishido, K. Fukushima, T. Kanomata

PHYSICAL REVIEW LETTERS　104　(17)　176401-1-176401-4　2010/04

DOI： 10.1103/PhysRevLett.104.176401 　

ISSN： 0031-9007
Half-metallic behavior of Co2MnSi/Co2MnAl/MgO interface and its coherent tunneling conductance Peer-reviewed

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)　200　(5)　052016-1-052016-4　2010

DOI： 10.1088/1742-6596/200/5/052016 　

ISSN： 1742-6588
Magnetic properties of quaternary Heusler alloys Ni2-xCoxMnGa Peer-reviewed

T. Kanomata, Y. Kitsunai, K. Sano, Y. Furutani, H. Nishihara, R. Y. Umetsu, R. Kainuma, Y. Miura, M. Shirai

PHYSICAL REVIEW B　80　(21)　2009/12

DOI： 10.1103/PhysRevB.80.214402 　

ISSN： 1098-0121
Magnetic properties of quaternary Heusler alloys Ni2-xCoxMnGa (vol 80, 214402, 2009) Peer-reviewed

T. Kanomata, Y. Kitsunai, K. Sano, Y. Furutani, H. Nishihara, R. Y. Umetsu, R. Kainuma, Y. Miura, M. Shirai

PHYSICAL REVIEW B　80　(21)　214402-1-214402-6　2009/12

DOI： 10.1103/PhysRevB.80.219902 　

ISSN： 1098-0121
Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states Peer-reviewed

S. Mizukami, D. Watanabe, M. Oogane, Y. Ando, Y. Miura, M. Shirai, T. Miyazaki

JOURNAL OF APPLIED PHYSICS　105　(7)　07D306-1-07D306-3　2009/04

DOI： 10.1063/1.3067607 　

ISSN： 0021-8979
Absence of temperature dependence of the valence-band spectrum of Co2MnSi Peer-reviewed

K. Miyamoto, A. Kimura, Y. Miura, M. Shirai, M. Ye, Y. Cui, K. Shimada, H. Namatame, M. Taniguchi, Y. Takeda, Y. Saitoh, E. Ikenaga, S. Ueda, K. Kobayashi, T. Kanomata

PHYSICAL REVIEW B　79　(10)　100405(R)-1-100405(R)-4　2009/03

DOI： 10.1103/PhysRevB.79.100405 　

ISSN： 2469-9950

eISSN： 2469-9969
Half-metallic interface between a Heusler alloy and Si Peer-reviewed

Kazutaka Abe, Yoshio Miura, Yasunori Shiozawa, Masafumi Shirai

JOURNAL OF PHYSICS-CONDENSED MATTER　21　(6)　064244-1-064244-5　2009/02

DOI： 10.1088/0953-8984/21/6/064244 　

ISSN： 0953-8984

eISSN： 1361-648X
Computational design of highly spin polarized hetero junction between Heusler alloys and MgO Peer-reviewed

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Journal of the Magnetics Society of Japan　33　(2)　105-109　2009/02
Publisher: The Magnetics Society of Japan (MSJ)
DOI： 10.3379/msjmag.0901RE8062 　

ISSN： 1882-2924

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We investigate and discuss electronic structures and tunneling conductance of magnetic tunnel junctions (MTJs) with the Co₂CrGa and MgO on the basis of the density-functional first-principles calculations. We found that the CrGa-terminated Co₂CrGa/MgO(001) junction has no interface states and preserves the high spin-polarization of Co₂CrGa at the interface. We showed that the large enhancement of the interfacial Cr spin moment plays an important role to make the half-metallic gap in the CrGa-terminated Co₂CrGa/MgO(001) interface. Finally, we have proposed that addition of an ultrathin Co₂CrGa layer between Co₂MnSi electrode and MgO barrier is effective to eliminate interface states in both sides of the junction with preserving the coherent tunneling through the Δ₁ channel of the MTJ in parallel magnetization.
The effect of the interface oxidation ontunneling conductance of Co 2MnSi/MgO/Co2MnSi magnetic tunneljunction Peer-reviewed

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Journal of Physics Condensed Matter　21　(6)　064245-1-064245-6　2009

DOI： 10.1088/0953-8984/21/6/064245 　

ISSN： 0953-8984 1361-648X
Theoretical Studies on Spin-Dependent Conductance in FePt/MgO/FePt(001) Magnetic Tunnel Junctions Peer-reviewed

Yujiro Taniguchi, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

IEEE TRANSACTIONS ON MAGNETICS　44　(11)　2585-2588　2008/11

DOI： 10.1109/TMAG.2008.2002515 　

ISSN： 0018-9464

eISSN： 1941-0069
Half-metallic interface and coherent tunneling in Co2 YZ/MgO/ Co2 YZ (YZ=MnSi,CrAl) magnetic tunnel junctions: A first-principles study Peer-reviewed

Yoshio Miura, Hirohisa Uchida, Yoshihiro Oba, Kazutaka Abe, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　78　(6)　2008/08/18

DOI： 10.1103/PhysRevB.78.064416 　

ISSN： 1098-0121 1550-235X
Half-metallic interface and coherent tunneling in Co(2)YZ/MgO/Co(2)YZ (YZ = MnSi,CrAl) magnetic tunnel junctions: A first-principles study Peer-reviewed

Yoshio Miura, Hirohisa Uchida, Yoshihiro Oba, Kazutaka Abe, Masafumi Shirai

PHYSICAL REVIEW B　78　(6)　064416-1-064416-9　2008/08

DOI： 10.1103/PhysRevB.78.064416 　

ISSN： 2469-9950

eISSN： 2469-9969
The computational materials design of (Ga,Cr)N: effects of co-doping on exchange interactions Peer-reviewed

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

JOURNAL OF PHYSICS-CONDENSED MATTER　19　(36)　365238/1-365238/6　2007/09

DOI： 10.1088/0953-8984/19/36/365238 　

ISSN： 0953-8984

eISSN： 1361-648X
Coherent tunnelling conductance in magnetic tunnel junctions of half-metallic full Heusler alloys with MgO barriers Peer-reviewed

Yoshio Miura, Hirohisa Uchida, Yoshihiro Oba, Kazutaka Nagao, Masafumi Shirai

JOURNAL OF PHYSICS-CONDENSED MATTER　19　(36)　365228/1-365228/7　2007/09

DOI： 10.1088/0953-8984/19/36/365228 　

ISSN： 0953-8984

eISSN： 1361-648X
Theoretical studies on the influence of oxygen impurity upon magnetic properties of (Ga,Cr)N Peer-reviewed

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　2155-2157　2007/03

DOI： 10.1016/j.jmmm.2006.11.036 　

ISSN： 0304-8853
First-principles calculations of half-metallic zinc-blende type superlattices Peer-reviewed

M Geshi, M Shirai, K Kusakabe, N Suzuki

COMPUTATIONAL MATERIALS SCIENCE　36　(1-2)　143-146　2006/05

DOI： 10.1016/j.commatsci.2004.11.013 　

ISSN： 0927-0256

eISSN： 1879-0801
Half-metallicity at the (110) interface between a full Heusler alloy and GaAs Peer-reviewed

K Nagao, Y Miura, M Shirai

PHYSICAL REVIEW B　73　(10)　104447-1-104447-7　2006/03

DOI： 10.1103/PhysRevB.73.104447 　

ISSN： 1098-0121

eISSN： 1550-235X
Ab initio study on stability of half-metallic Co-based full-Heusler alloys Peer-reviewed

Yoshio Miura, Masafumi Shirai, Kazutaka Nagao

Journal of Applied Physics　99　(8)　08J112/1-08J112/3　2006

DOI： 10.1063/1.2176907 　

ISSN： 0021-8979
The exchange interaction in (Ga,Cr)N doped with oxygen impurities Peer-reviewed

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　3　(12)　4147-4150　2006

DOI： 10.1002/pssc.200672842 　

ISSN： 1862-6351
The computational design of zinc-blende half-metals and their nanostructures Peer-reviewed

M Shirai

JOURNAL OF PHYSICS-CONDENSED MATTER　16　(48)　S5525-S5531　2004/12

DOI： 10.1088/0953-8984/16/48/007 　

ISSN： 0953-8984

eISSN： 1361-648X
Ab initio calculations of spin polarization at Co2CrAl/GaAs interfaces Peer-reviewed

K Nagao, M Shirai, Y Miura

JOURNAL OF PHYSICS-CONDENSED MATTER　16　(48)　S5725-S5728　2004/12

DOI： 10.1088/0953-8984/16/48/036 　

ISSN： 0953-8984

eISSN： 1361-648X
First-principles design of ferromagnetic nanostructures based on group-IV semiconductors Peer-reviewed

Y Miura, M Shirai, K Nagao

JOURNAL OF PHYSICS-CONDENSED MATTER　16　(48)　S5735-S5738　2004/12

DOI： 10.1088/0953-8984/16/48/038 　

ISSN： 0953-8984
The lattice distortion effect for zinc-blende CrAs and CrSb Peer-reviewed

K Yamana, M Geshi, H Tsukamoto, Uchida, I, M Shirai, K Kusakabe, N Suzuki

JOURNAL OF PHYSICS-CONDENSED MATTER　16　(48)　S5815-S5818　2004/12

DOI： 10.1088/0953-8984/16/48/055 　

ISSN： 0953-8984
First-principles study on half-metallicity of disordered Co-2(Cr1-xFex)Al Peer-reviewed

Y Miura, M Shirai, K Nagao

JOURNAL OF APPLIED PHYSICS　95　(11)　7225-7227　2004/06

DOI： 10.1063/1.1669115 　

ISSN： 0021-8979
Ab initio calculations of zinc-blende CrAs/GaAs superlattices Peer-reviewed

K Nagao, M Shirai, Y Miura

JOURNAL OF APPLIED PHYSICS　95　(11)　6518-6520　2004/06

DOI： 10.1063/1.1687553 　

ISSN： 0021-8979
Theoretical study on anti-site defects in half-metallic zinc-blende ferromagnets Peer-reviewed

M Shirai, M Seike, K Sato, H Katayama-Yoshida

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　272　344-345　2004/05

DOI： 10.1016/j.jmmm.2003.11.125 　

ISSN： 0304-8853

eISSN： 1873-4766
Atomic disorder effects on half-metallicity of the full-Heusler alloys Co2(Cr1-xFex)A1: A first-principles study Peer-reviewed

Yoshio Miura, Kazutaka Nagao, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　69　(14)　1-144413　2004/04

DOI： 10.1103/PhysRevB.69.144413 　

ISSN： 0163-1829
Atomic disorder effects on half-metallicity of the full-Heusler alloys Co-2(Cr1-xFex)Al: A first-principles study Peer-reviewed

Y Miura, K Nagao, M Shirai

PHYSICAL REVIEW B　69　(14)　144413-1-144413-7　2004/04

DOI： 10.1103/PhysRevB.69.144413 　

ISSN： 1098-0121
Noncollinear magnetism in liquid oxygen: A first-principles molecular dynamics study

Oda Tatsuki, Pasquarello Alfredo

Physical review. B　70　(13)　134402-1-134402-19　2004
Publisher: American Physical Society
DOI： 10.1103/PhysRevB.70.134402 　

ISSN： 1098-0121
Possible half-metallic ferromagnetism in zinc blende CrSb and CrAs (invited) Invited Peer-reviewed

M Shirai

JOURNAL OF APPLIED PHYSICS　93　(10)　6844-6846　2003/05

DOI： 10.1063/1.1558604 　

ISSN： 0021-8979
Materials design of Cr-based half-metallic ferromagnets Peer-reviewed

M Shirai, K Ikeuchi, H Taguchi, H Akinaga

JOURNAL OF SUPERCONDUCTIVITY　16　(1)　27-29　2003/02

DOI： 10.1023/A:1023212029381 　

ISSN： 0896-1107
Epitaxial growth of zinc-blende CrAs/GaAs multilayer Peer-reviewed

M Mizuguchi, H Akinaga, T Manago, K Ono, M Oshima, M Shirai, M Yuri, HJ Lin, HH Hsieh, CT Chen

JOURNAL OF APPLIED PHYSICS　91　(10)　7917-7919　2002/05

DOI： 10.1063/1.1455612 　

ISSN： 0021-8979
In-situ photoelectron spectroscopy of magnetic dots and magnetic semiconductor nanostructures Peer-reviewed

M Oshima, K Ono, M Mizuguchi, M Yamada, J Okabayashi, A Fujimori, H Akinaga, M Shirai

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　16　(11-12)　1681-1690　2002/05

DOI： 10.1142/S021797920201110X 　

ISSN： 0217-9792

eISSN： 1793-6578
Materials design and synthesis of half-metallic CrAs Peer-reviewed

Takashi Manago, Masaki Mizuguchi, Hiro Akinaga, Masafumi Shirai, Kanta Ono, Masaharu Oshima

Journal of the Magnetics Society of Japan　26　(4)　441-444　2002/04
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.26.441 　

ISSN： 0285-0192

More details Close

New half-metallic ferromagnets have been found in a zinc-blende crystal structure. The zinc-blende CrAs has been designed by ab initio calculations and the calculation predicts the highly spin-polarized electronic band structure. The zinc-blende CrAs thin film has been synthesized on GaAs (001) substrates by molecular-beam epitaxy. The film shows ferromagnetic behavior at room temperature and the magnetic moment per formula unit of CrAs is estimated to be about 3 μ_B, which agrees well with the theoretical prediction. The photoemission spectra of the CrAs film showed the Fermi edges indicating the metallic characteristics and the small band dispersion derived from Cr-3d bands.
Epitaxial growth of new half-metallic ferromagnet "zinc-blende CrAs" and the substrate temperature dependence Peer-reviewed

M Mizuguchi, H Akinaga, T Manago, K Ono, M Oshima, M Shirai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　239　(1-3)　269-271　2002/02

DOI： 10.1016/S0304-8853(01)00568-6 　

ISSN： 0304-8853
Thickness dependence of photoemission spectra in zinc-blende CrAs Peer-reviewed

M Mizuguchi, K Ono, M Oshima, J Okabayashi, H Akinaga, T Manago, M Shirai

SURFACE REVIEW AND LETTERS　9　(1)　331-334　2002/02

DOI： 10.1142/S0218625X02002142 　

ISSN： 0218-625X
Electronic and magnetic properties of 3d transition-metal-doped GaAs Peer-reviewed

M Shirai

PHYSICA E　10　(1-3)　143-147　2001/05

DOI： 10.1016/S1386-9477(01)00070-4 　

ISSN： 1386-9477
Electronic and magnetoresistive properties of MnAs(0001)/GaAs(111) heterostructures Peer-reviewed

K Narita, M Shirai

PHYSICA E　10　(1-3)　433-436　2001/05

DOI： 10.1016/S1386-9477(01)00132-1 　

ISSN： 1386-9477
Material design of half-metallic zinc-blende CrAs and the synthesis by molecular-beam epitaxy Peer-reviewed

H Akinaga, T Manago, M Shirai

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　39　(11B)　L1118-L1120　2000/11

DOI： 10.1143/JJAP.39.L1118 　

ISSN： 0021-4922
Photoemission study of electron correlation in M7X8 (M=Fe, Co; X=S, Se) Peer-reviewed

K Shimada, T Mizokawa, A Fujimori, M Shirai, T Kamimura

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　101　777-781　1999/06

DOI： 10.1016/S0368-2048(98)00366-1 　

ISSN： 0368-2048
Spin-resolved core-level and valence-band photoemission spectroscopy of ferromagnetic MnAs Peer-reviewed

K Shimada, O Rader, A Fujimori, A Kimura, K Ono, N Kamakura, A Kakizaki, M Tanaka, M Shirai

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　101　383-387　1999/06

DOI： 10.1016/S0368-2048(98)00393-4 　

ISSN： 0368-2048
First-principles calculations of electronic structures of diluted magnetic semiconductors (Ga,Mn)As Peer-reviewed

T Ogawa, M Shirai, N Suzuki, Kitagawa, I

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　196　428-429　1999/05

DOI： 10.1016/S0304-8853(98)00794-X 　

ISSN： 0304-8853
First-principles electronic structure calculations of MnAs/GaAs(001) magnetic multilayers Peer-reviewed

M Shirai

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　38　(Supplement 38-1)　423-424　1999

ISSN： 0021-4922
Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures Peer-reviewed

VM Svistunov, VY Tarenkov, AI D'yachenko, R Aoku, H Murakami, M Shirai

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS　86　(4)　763-770　1998/04

DOI： 10.1134/1.558537 　

ISSN： 1063-7761
Spin-integrated and spin-resolved photoemission study of Fe chalcogenides Peer-reviewed

K Shimada, T Mizokawa, K Mamiya, T Saitoh, A Fujimori, K Ono, A Kakizaki, T Ishii, M Shirai, T Kamimura

PHYSICAL REVIEW B　57　(15)　8845-8853　1998/04

DOI： 10.1103/PhysRevB.57.8845 　

ISSN： 1098-0121

eISSN： 1550-235X
Spin- and angle-resolved photoemission spectroscopy of ferromagnetic MnAs Peer-reviewed

K Shimada, O Rader, A Fujimori, A Kimura, K Ono, N Kamakura, A Kakizaki, M Tanaka, M Shirai

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　88　207-212　1998/03

DOI： 10.1016/S0368-2048(97)00129-1 　

ISSN： 0368-2048
Surface preparation and spin-resolved photoemission of epitaxial MnSb(0001) films on GaAs(111) Peer-reviewed

O Rader, A Kimura, N Kamakura, KS An, A Kakizaki, S Miyanishi, H Akinaga, M Shirai, K Shimada, A Fujimori

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　88　225-228　1998/03

DOI： 10.1016/S0368-2048(97)00111-4 　

ISSN： 0368-2048
A new method of superconducting energy gap spectroscopy Peer-reviewed

GA Gogadze, VM Svistunov, R Aoki, H Murakami, M Shirai

PHYSICA C　297　(3-4)　232-238　1998/03

DOI： 10.1016/S0921-4534(97)01875-3 　

ISSN： 0921-4534
Theoretical study on photoemission spectra of ferromagnetic manganese pnictides Peer-reviewed

M Shirai, Y Tokioka

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　88　357-360　1998/03

DOI： 10.1016/S0368-2048(97)00179-5 　

ISSN： 0368-2048
Pressure effect on electronic band structure of NiAs-type CrTe Peer-reviewed

M Takagaki, T Kawakami, N Tanaka, M Shirai, K Motizuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　67　(3)　1014-1016　1998/03

DOI： 10.1143/JPSJ.67.1014 　

ISSN： 0031-9015
Theoretical investigation of magnetic structure and hyperfine field of NaCl-type FeN Peer-reviewed

H Shimizu, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　67　(3)　922-926　1998/03

DOI： 10.1143/JPSJ.67.922 　

ISSN： 0031-9015
Band structures of zinc-blende-type MnAs and (MnAs)(1)(GaAs)(1) superlattice Peer-reviewed

M Shirai, T Ogawa, Kitagawa, I, N Suzuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　177　1383-1384　1998/01

DOI： 10.1016/S0304-8853(97)00350-8 　

ISSN： 0304-8853
Electronic band structure of antiferromagnetic spinel Co3S4 Peer-reviewed

S Miyazaki, M Shirai, N Suzuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　177　1367-1368　1998/01

DOI： 10.1016/S0304-8853(97)00472-1 　

ISSN： 0304-8853
Exchange splittings of Mn- and Sb-derived states by spin-resolved valence-band photoemission of MnSb Peer-reviewed

O Rader, A Kimura, N Kamakura, KS An, A Kakizaki, S Miyanishi, H Akinaga, M Shirai, K Shimada, A Fujimori

PHYSICAL REVIEW B　57　(2)　R689-R692　1998/01

DOI： 10.1103/PhysRevB.57.R689 　

ISSN： 1098-0121

eISSN： 1550-235X
Pressure effect on electronic band structures of NiAs-type chromium chalcogenides Peer-reviewed

M Takagaki, T Kawakami, M Shirai, K Motizuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　177　1385-1386　1998/01

DOI： 10.1016/S0304-8853(97)00433-2 　

ISSN： 0304-8853
Electronic, structural and magnetic properties of transition-metal mononitrides Peer-reviewed

H Shimizu, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　66　(10)　3147-3152　1997/10

DOI： 10.1143/JPSJ.66.3147 　

ISSN： 0031-9015
Optical phonon contribution to the high Tc Cooper-pairing investigated by tunneling spectrum Peer-reviewed

R Aoki, H Murakami, M Shirai, VM Svistunov, DN Afanassyev

PHYSICA C　282　979-980　1997/08

DOI： 10.1016/S0921-4534(97)00617-5 　

ISSN： 0921-4534
Spin-integrated and -resolved photoemission study of iron chalcogenides Peer-reviewed

K Shimada, T Mizokawa, K Mamiya, T Saitoh, A Fujimori, K Ono, A Kakizaki, T Ishii, M Shirai, T Kamimura

PHYSICA B　237　394-396　1997/07

DOI： 10.1016/S0921-4526(97)00249-4 　

ISSN： 0921-4526
Pressure effects on electronic structures of ordered alloys MPt3 (M=V, Cr, Mn, Fe, Co) Peer-reviewed

M Shirai

PHYSICA B　237　351-352　1997/07

DOI： 10.1016/S0921-4526(97)00218-4 　

ISSN： 0921-4526
Electronic structure and magnetism of transition-metal mononitride Peer-reviewed

H Shimizu, M Shirai, N Suzuki

PHYSICA B　237　546-547　1997/07

DOI： 10.1016/S0921-4526(97)00223-8 　

ISSN： 0921-4526
Spin and orbital moments of YCo5 Peer-reviewed

Kitagawa, I, M Shirai, N Suzuki, ET Kulatov, SV Halilov

PHYSICA B　237　563-564　1997/07

DOI： 10.1016/S0921-4526(97)00248-2 　

ISSN： 0921-4526
Effect of intercalation on structural instability and superconductivity of layered 2H-type NbSe2 and NbS2 Peer-reviewed

K Motizuki, Y Nishio, M Shirai, N Suzuki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　57　(6-8)　1091-1096　1996/06

DOI： 10.1016/0022-3697(95)00401-7 　

ISSN： 0022-3697
First-principles calculation of optical conductivity of FeSe and CoSe Peer-reviewed

H Ikeda, M Shirai, N Suzuki, K Motizuki

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　78　91-94　1996/05

DOI： 10.1016/S0368-2048(96)80034-X 　

ISSN： 0368-2048
Electronic band structure and photoemission spectra of Fe7S8 Peer-reviewed

M Shirai, N Suzuki, K Motizuki

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　78　95-98　1996/05

DOI： 10.1016/S0368-2048(96)80035-1 　

ISSN： 0368-2048
Spin-polarized and spin-integrated photoemission study of itinerant ferrimagnetic iron chalcogenides Peer-reviewed

K Shimada, T Mizokawa, T Saitoh, K Mamiya, A Fujimori, K Ono, A Kakizaki, T Ishii, M Shirai, T Kamimura

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA　78　317-320　1996/05

DOI： 10.1016/S0368-2048(96)80088-0 　

ISSN： 0368-2048
First-principles calculation of lattice dynamics and electron-phonon interaction in high pressure phase of solid iodine Peer-reviewed

N Suzuki, H Sakamoto, T Oda, M Shirai

PHYSICA B-CONDENSED MATTER　219-20　454-456　1996/04

DOI： 10.1016/0921-4526(96)00776-4 　

ISSN： 0921-4526
Manifestation of electron-phonon interaction in phonon anomaly, superconductivity and transport properties of layered 2H-NbS2 Peer-reviewed

K Motizuki, Y Nishio, M Shirai, N Suzuki

PHYSICA B-CONDENSED MATTER　219-20　83-85　1996/04

DOI： 10.1016/0921-4526(95)00657-5 　

ISSN： 0921-4526
Anisotropy effects on superconductivity in layered material NbS2 Peer-reviewed

M Shirai, Y Nishio

PHYSICA B-CONDENSED MATTER　219-20　207-209　1996/04

DOI： 10.1016/0921-4526(95)00697-4 　

ISSN： 0921-4526
First-principles study on lattice dynamics and Electron-Phonon interaction in an oxide spinel LiTi2O4 Peer-reviewed

T Oda, M Shirai, N Suzuki, K Motizuki

PHYSICA B-CONDENSED MATTER　219-20　451-453　1996/04

DOI： 10.1016/0921-4526(95)00775-X 　

ISSN： 0921-4526
Phonon contribution on the high T-c Cooper pairing investigated by tunnelling spectroscopy Peer-reviewed

R Aoki, H Murakami, T Kita, M Shirai, Y Nishio, VM Svistunov, AI Dyachenko, DN Afanassyev

PHYSICA B-CONDENSED MATTER　219-20　172-174　1996/04

DOI： 10.1016/0921-4526(95)00686-9 　

ISSN： 0921-4526
Application of frozen-phonon method to lattice dynamics in FCC solid iodine Peer-reviewed

H Sakamoto, T Oda, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　65　(2)　489-495　1996/02

DOI： 10.1143/JPSJ.65.489 　

ISSN： 0031-9015
Full-potential calculation of electronic structure of sulphide spinels Peer-reviewed

Tatsuki Oda, Masafumi Shirai, Naoshi Suzuki, Kazuko Motizuki

Crystal Research and Technology　31　(Supplement)　877-880　1996
Tunneling spectrum indicating phonon contribution to high T-c oxide superconductivity Peer-reviewed

R Aoki, H Murakami, M Shirai, VM Svistunov, AI Dyachenko, DN Afanassyev

CZECHOSLOVAK JOURNAL OF PHYSICS　46　(3 Supplement)　1339-1340　1996

DOI： 10.1007/BF02562784 　

ISSN： 0011-4626
Spin-polarized band structure for organic molecular crystals Peer-reviewed

Tohru Kawamoto, Masafumi Shirai, Naoshi Suzuki

Molecular Crystals and Liquid Crystals　286　(1)　211-216　1996

DOI： 10.1080/10587259608042288 　
Tunneling observation of phonon contribution to the pairing interaction in oxide superconductors Peer-reviewed

R Aoki, H Murakami, T Kita, M Shirai, VM Svistunov, AI Dyachenko, DN Afanassyev

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　56　(12)　1801-1802　1995/12

DOI： 10.1016/0022-3697(95)00159-X 　

ISSN： 0022-3697
PRESSURE EFFECTS ON ELECTRONIC-STRUCTURE AND ELECTRON-LATTICE INTERACTION OF CUBIC PHASE OF SOLID IODINE Peer-reviewed

H SAKAMOTO, M SHIRAI, N SUZUKI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　64　(10)　3860-3870　1995/10

DOI： 10.1143/JPSJ.64.3860 　

ISSN： 0031-9015
ELECTRONIC BAND-STRUCTURE OF SULFIDE SPINELS CUM(2)S(4) (M=CO, RH, IR) Peer-reviewed

T ODA, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF PHYSICS-CONDENSED MATTER　7　(23)　4433-4446　1995/06

DOI： 10.1088/0953-8984/7/23/012 　

ISSN： 0953-8984
ELECTRONIC-STRUCTURE OF THALLIUM COPPER CHALCOGENIDES TLCU2S2 AND TLCU2SE2 Peer-reviewed

M SHIRAI

SYNTHETIC METALS　71　(1-3)　1857-1858　1995/04

DOI： 10.1016/0379-6779(94)03079-L 　

ISSN： 0379-6779
ELECTRON-PHONON INTERACTION AND STRUCTURAL INSTABILITY OF MIXED-VALENCE COMPOUNDS CS(2)AU(2)X(6) (X=CL, BR, I) Peer-reviewed

M SHIRAI, A SAITO

SYNTHETIC METALS　71　(1-3)　2043-2044　1995/04

DOI： 10.1016/0379-6779(94)03157-2 　

ISSN： 0379-6779
THEORETICAL-STUDY ON POSSIBILITY OF ORGANIC METALLIC FERROMAGNETISM Peer-reviewed

T KAWAMOTO, M SHIRAI, N SUZUKI

SYNTHETIC METALS　71　(1-3)　1789-1790　1995/04

DOI： 10.1016/0379-6779(94)03051-7 　

ISSN： 0379-6779
SPIN-POLARIZED BAND-STRUCTURE OF CU3AU-TYPE COMPOUNDS MPT(3) (M=C, CR, MN, FE, CO) Peer-reviewed

M SHIRAI, H MAESHIMA, N SUZUKI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　140　105-106　1995/02

DOI： 10.1016/0304-8853(94)01116-8 　

ISSN： 0304-8853
SPIN-WAVES IN MN3PT Peer-reviewed

Y HIRANO, N SUZUKI, M SHIRAI, K MOTIZUKI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　140　1975-1976　1995/02

DOI： 10.1016/0304-8853(94)01117-6 　

ISSN： 0304-8853
ELECTRONIC BAND-STRUCTURE AND MAGNETIC AND OPTICAL-PROPERTIES OF FE7SE8 AND CO7SE8 Peer-reviewed

H IKEDA, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　140　159-160　1995/02

DOI： 10.1016/0304-8853(94)00678-4 　

ISSN： 0304-8853
First-principles band structure calculation for organic molecular crystals Peer-reviewed

N Suzuki, T Kawamoto, M Shirai

MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS　271　(1)　A161-A165　1995

DOI： 10.1080/10587259508055284 　

ISSN： 1058-725X
ELECTRON-PHONON INTERACTION, LATTICE-DYNAMICS AND SUPERCONDUCTIVITY OF AN OXIDE SPINEL LITI2O4 Peer-reviewed

T ODA, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF PHYSICS-CONDENSED MATTER　6　(35)　6997-7012　1994/08

DOI： 10.1088/0953-8984/6/35/009 　

ISSN： 0953-8984

eISSN： 1361-648X
ROLE OF ELECTRON-PHONON INTERACTION IN LATTICE-DYNAMICS AND SUPERCONDUCTIVITY OF OXIDE SPINEL LITI2O4 Peer-reviewed

T ODA, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF SUPERCONDUCTIVITY　7　(3)　555-558　1994/06

DOI： 10.1007/BF00728458 　

ISSN： 0896-1107
ROLE OF ELECTRON-LATTICE INTERACTION IN LAYERED TRANSITION-METAL DICHALCOGENIDE 2H-NBS2 .1. PHONON ANOMALY AND SUPERCONDUCTIVITY Peer-reviewed

Y NISHIO, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　63　(1)　156-167　1994/01

DOI： 10.1143/JPSJ.63.156 　

ISSN： 0031-9015
THE ROLE OF ELECTRON-PHONON INTERACTION IN OXIDE SUPERCONDUCTORS Peer-reviewed

K MOTIZUKI, M SHIRAI

PHYSICA B-CONDENSED MATTER　186-88　816-821　1993/05

DOI： 10.1016/0921-4526(93)90712-F 　

ISSN： 0921-4526

eISSN： 1873-2135
ELECTRONIC BAND STRUCTURES OF MIXED-VALENCE COMPOUNDS CS2AU2X6 (X = CL, BR, I) Peer-reviewed

M SHIRAI

SYNTHETIC METALS　56　(2-3)　3389-3394　1993/04

DOI： 10.1016/0379-6779(93)90133-H 　

ISSN： 0379-6779
ELECTRON-PHONON INTERACTION AND SUPERCONDUCTIVITY IN OXIDE SUPERCONDUCTORS LA2-XSRXCUO4 Peer-reviewed

M SHIRAI, T KINOSHITA, K MOTIZUKI

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　7　(1-3)　182-185　1993/01

DOI： 10.1142/S021797929300041X 　

ISSN： 0217-9792
ELECTRONIC-STRUCTURE AND FERROMAGNETIC-ANTIFERROMAGNETIC TRANSITION IN CUBIC PEROVSKITE-TYPE COMPOUND MN3GAC Peer-reviewed

M SHIRAI, Y OHATA, N SUZUKI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(Supplement 32-3)　250-252　1993

ISSN： 0021-4922
ELECTRONIC-STRUCTURE AND MAGNETIC AND OPTICAL-PROPERTIES OF NIAS-TYPE TRANSITION-METAL CHALCOGENIDES MX (M=FE, CO - X=S, SE) Peer-reviewed

H IKEDA, M SHIRAI, N SUZUKI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(Supplement 32-3)　301-303　1993

ISSN： 0021-4922
ELECTRON-PHONON INTERACTION, LATTICE-DYNAMICS AND SUPERCONDUCTIVITY OF LAYERED TRANSITION-METAL DICHALCOGENIDE NBS2 Peer-reviewed

Y NISHIO, M SHIRAI, N SUZUKI, K MOTIZUKI

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　7　(1-3)　188-192　1993/01

DOI： 10.1142/S0217979293000421 　

ISSN： 0217-9792
PRESSURE EFFECTS ON ELECTRONIC-STRUCTURE AND MAGENTISM OF CU2SB-TYPE COMPOUND MN2SB Peer-reviewed

N SUZUKI, K YOSHIDA, M SHIRAI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(Supplement 32-3)　245-247　1993

ISSN： 0021-4922
ELECTRONIC BAND STRUCTURES OF ANTIFERROMAGNETIC ORDERED ALLOY FEPT3 Peer-reviewed

T SUDA, M SHIRAI, K MOTIZUKI

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　7　(1-3)　765-769　1993/01

DOI： 10.1142/S021797929300161X 　

ISSN： 0217-9792
THE ELECTRONIC BAND STRUCTURES FOR AN ANTIFERROMAGNETIC STATE OF CU2SB-TYPE INTERMETALLIC COMPOUND CR2AS Peer-reviewed

M SHIRAI, T KAWAMOTO, K MOTIZUKI

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　7　(1-3)　770-773　1993/01

DOI： 10.1142/S0217979293001621 　

ISSN： 0217-9792
THEORETICAL-STUDY OF MAGNETIC-ORDERING OF CU2SB-TYPE INTERMETALLIC COMPOUNDS Invited Peer-reviewed

K MOTIZUKI, M SUZUKI, M SHIRAI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(Supplement 32-3)　221-226　1993

ISSN： 0021-4922
ELECTRONIC BAND STRUCTURES OF INTERMETALLIC COMPOUND CU2SB Peer-reviewed

T ITO, M SHIRAI, K MOTIZUKI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　61　(7)　2202-2205　1992/07

DOI： 10.1143/JPSJ.61.2202 　

ISSN： 0031-9015
ELECTRONIC BAND STRUCTURES AND MAGNETISM OF INTERMETALLIC CU2SB-TYPE MANGANESE COMPOUNDS MNALGE AND MNGAGE Peer-reviewed

K MOTIZUKI, T KORENARI, M SHIRAI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　104　1923-1924　1992/02

DOI： 10.1016/0304-8853(92)91605-S 　

ISSN： 0304-8853
ELECTRONIC BAND-STRUCTURE IN THE FERRIMAGNETIC STATE OF MN2SB Peer-reviewed

M SUZUKI, M SHIRAI, K MOTIZUKI

JOURNAL OF PHYSICS-CONDENSED MATTER　4　(1)　L33-L36　1992/01

DOI： 10.1088/0953-8984/4/1/008 　

ISSN： 0953-8984
THEORETICAL-STUDY OF SUPERCONDUCTIVITY IN BAXK1-XBIO3 Peer-reviewed

K MOTIZUKI, M SHIRAI, N SUZUKI

PROCEEDINGS OF THE FOURTH ASIA PACIFIC PHYSICS CONFERENCE, VOLS 1 AND 2　629-632　1991
ELECTRON-PHONON INTERACTION AND SUPERCONDUCTIVITY IN BAXK1-XBIO3 Peer-reviewed

K MOTIZUKI, M SHIRAI, N SUZUKI

ELECTRON-PHONON INTERACTION IN OXIDE SUPERCONDUCTORS　176-187　1991
SUCCESSIVE MAGNETIC PHASE-TRANSITIONS IN MN3PT Peer-reviewed

M SHIRAI, T TANIMOTO, K MOTIZUKI

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　90-1　157-158　1990/12

DOI： 10.1016/S0304-8853(10)80052-6 　

ISSN： 0304-8853
ELECTRON LATTICE INTERACTION AND SUPERCONDUCTIVITY IN BAPB1-XBIXO3 AND BAXK1-XBIO3 Peer-reviewed

M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF PHYSICS-CONDENSED MATTER　2　(15)　3553-3566　1990/04

DOI： 10.1088/0953-8984/2/15/012 　

ISSN： 0953-8984
THEORETICAL-STUDY OF TUNNELING SPECTRA IN BAXK1-XBIO3 Peer-reviewed

M SHIRAI, N SUZUKI, K MOTIZUKI

SOLID STATE COMMUNICATIONS　73　(9)　633-635　1990/03

DOI： 10.1016/0038-1098(90)90253-8 　

ISSN： 0038-1098
SUPERCONDUCTIVITY IN BAPB1-XBIXO3 AND BAXK1-XBIO3 Peer-reviewed

M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF PHYSICS-CONDENSED MATTER　1　(17)　2939-2943　1989/05

DOI： 10.1088/0953-8984/1/17/014 　

ISSN： 0953-8984
ELECTRON-PHONON INTERACTION AND LATTICE-DYNAMICS IN BAPB1-XBIXO3 Peer-reviewed

M SHIRAI, N SUZUKI, K MOTIZUKI

FERROELECTRICS　96　(1)　99-103　1989

DOI： 10.1080/00150198908216754 　

ISSN： 0015-0193
MICROSCOPIC THEORY OF ELECTRON-PHONON INTERACTION AND SUPERCONDUCTIVITY OF BAPB1-XBIXO3 Peer-reviewed

M SHIRAI, N SUZUKI, K MOTIZUKI

SOLID STATE COMMUNICATIONS　60　(6)　489-493　1986/11

DOI： 10.1016/0038-1098(86)90723-4 　

ISSN： 0038-1098

eISSN： 1879-2766
MAGNETIC EXCITATIONS AND SUCCESSIVE PHASE-TRANSITION IN RBFEBR3-TYPE MODIFIED TRIANGULAR ANTIFERROMAGNETS Peer-reviewed

N SUZUKI, M SHIRAI

PHYSICA B & C　136　(1-3)　346-348　1986/01

DOI： 10.1016/S0378-4363(86)80088-2 　

ISSN： 0378-4371

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Misc. 159

D0₁₉型X₃Sn(X=Fe,Mn)薄膜の作製とその磁気伝導特性

前野央, 柳瀬隆, 島田敏宏, 辻川雅人, 辻川雅人, 白井正文, 白井正文, 長浜太郎

応用物理学会春季学術講演会講演予稿集(CD-ROM)　66th　2019
Uniaxial magnetic anisotropy of tetragonal FeCo based alloyt films and its perspective to new permanent magnet

水口将輝, 高梨弘毅, 堀田善治, 白井正文, 小嗣真人

電気学会マグネティックス研究会資料　MAG-16　(178-196)　85‐88　2016/11/28
第三元素を添加したFe/Ni薄膜の規則化現象

田代敬之, 水口将輝, 小金澤智之, 鈴木英伸, 三浦良雄, 辻川雅人, 白井正文, 高梨弘毅

日本磁気学会学術講演概要集　40th　2016

ISSN： 1882-2959
Co/Niエピタキシャル人工格子における磁気異方性とダンピング

関剛斎, 島田淳平, 飯浜賢志, 辻川雅人, 小金澤智之, 塩田明弘, 田代敬之, ZHOU W., 菊池直登, 水上成美, 白井正文, 高梨弘毅

日本磁気学会学術講演概要集　40th　2016

ISSN： 1882-2959
Ti添加によるL1₀-FeNi規則合金薄膜の作製と評価

田代敬之, 水口将輝, 小金澤智之, 三浦良雄, 辻川雅人, 白井正文, 鈴木英伸, 高梨弘毅

日本金属学会講演概要(CD-ROM)　158th　2016

ISSN： 2433-3093
原子層積層制御したCo/Niエピタキシャル人工格子における磁気特性

関剛斎, 島田淳平, 飯浜賢志, 辻川雅人, 小金澤智之, 田代敬之, 周偉男, 菊池直登, 水上成美, 白井正文, 高梨弘毅

日本金属学会講演概要(CD-ROM)　159th　2016

ISSN： 2433-3093
[Fe-X/Ni](X=Ti,V)多層膜のL1₀規則化

田代敬之, 水口将輝, 小金澤智之, 鈴木英伸, 三浦良雄, 辻川雅人, 白井正文, 高梨弘毅

日本金属学会講演概要(CD-ROM)　159th　2016

ISSN： 2433-3093
7pPSA-92 Theoretical design of Co-based Heusler alloys undergoing magnetostructural phase transformation

Kano S., Tsujikawa M., Abe K., Shirai M.

Meeting abstracts of the Physical Society of Japan　69　(2)　283-283　2014/08/22
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aPS-33 A first-principles study on the electronic structure of Mn_<3-δ>X_δGa(X=Fe,Co,Ni) and the transport property of MTJ

Tanibayashi Satoru, Miura Yoshio, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　69　(1)　482-482　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aPS-20 Role of lattice distortion in the electric field control of magnetism at the MgO/FeCo interface

Tsujikawa Masahito, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　69　(1)　479-479　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aAY-3 Study on electronic structures of FeNi ordered alloy thin films by photoelectron spectroscopy

Mizuguchi Masaki, Ueda Shigenori, Miura Yoshio, Kojima Takayuki, Shirai Masafumi, Takanashi Koki

Meeting abstracts of the Physical Society of Japan　69　(1)　537-537　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30aAY-3 Study on electronic structures of FeNi ordered alloy thin films by photoelectron spectroscopy

Mizuguchi Masaki, Ueda Shigenori, Miura Yoshio, Kojima Takayuki, Shirai Masafumi, Takanashi Koki

Meeting abstracts of the Physical Society of Japan　69　(1)　904-904　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic anisotropy of Co-based Heusler alloy and MgO interface: a first principles study

Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　68　(2)　364-364　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
A first-principles study on substitution effects on magnetocrystalline anisotropy of L1_0-FeNi

Miura Y., Ozaki S., Tsujikawa M., Shirai M.

Meeting abstracts of the Physical Society of Japan　68　(2)　382-382　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
New Approach to Spin-Resolved Phetoemission using Hard X-rays

Ueda S., Mizuguchi M., Kojima T., Ishimaru S., Tsujikawa M., Shirai M., Takanashi K., Sakata O.

Meeting abstracts of the Physical Society of Japan　68　(2)　700-700　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic states of heusler alloy Ni_2MnGa studied by hard x-ray photoelectron spectroscopy

Terashima K., Ko A., Yamada S., Nonaka Y., Higashiya A., Sekiyama A., Tamasaku K., Fujiwara H., Yamasaki A., Tsunekawa M., Suga S., Tanaka Y., Yabashi M., Ishikawa T., Shirai M., Kanomata T., Imada S.

Meeting abstracts of the Physical Society of Japan　68　(2)　700-700　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29aXW-11 Electric field effects on perpendicular magnetic anisotropy of MgO/CoFeAl interface

Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　68　(1)　562-562　2013/03/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic anisotropy of L10o-type FeNi thin films studied by x-ray magnetic circular dichroism

Ohtsuki T, Shirai M, Takanashi K, Kojima T, Kotsugi M, Ohkochi T, Ohtsuki T, Ogiwara M, Tashiro T, Mizuguchi M, Miura Y

Meeting Abstracts of the Physical Society of Japan　68　(0)　370-370　2013
Publisher: The Physical Society of Japan
ISSN： 1342-8349
19aCC-11 Interface magnetic anisotropy of Fe/metal nitride (carbide) film

Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　67　(2)　413-413　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
20pCC-8 A first-principles study on spin-dependent transport of MTJs with MgAl_2O_4

Miura Y., Muramoto S., Abe K., Shirai M.

Meeting abstracts of the Physical Society of Japan　67　(2)　433-433　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aPS-32 Theoretical study on magnetic anisotropy of Fe/GaAs interface

Miura Y., Tsujikawa M., Shirai M.

Meeting abstracts of the Physical Society of Japan　67　(1)　482-482　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aBG-2 Magnetic anisotropy of Fe/CoMgO interfaces and its electric field effect.

Tsujikawa M., Miura Y., Shirai M.

Meeting abstracts of the Physical Society of Japan　67　(1)　470-470　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
日本磁気学会編, 井上順一郎,伊藤博介著, スピントロニクス-基礎編-, 共立出版, 東京, 2010, xi+278p, 22×16cm, 本体3,600円, (現代講座・磁気工学3), [大学院向], ISBN978-4-320-08589-3

白井正文

日本物理學會誌　67　(1)　2012/01/05
Publisher: 社団法人日本物理学会
ISSN： 0029-0181
Fabrication and Properties of Novel Metal-free L1_0 Type FeNi Ordered Alloy with High Magnetic Anisotropy

MIZUGUCHI Masaki, KOJIMA Takayuki, TAKANASHI Koki, KOTSUGI Masato, SHIRAI Masafumi

Materia Japan　50　(9)　389-392　2011/09/01
Publisher: The Japan Institute of Metals
DOI： 10.2320/materia.50.389 　

ISSN： 1340-2625
21aPS-38 A first-principles study on exchange coupling at interface of Heusler alloys and MgO

Miura Y, Abe K, Shirai M

Meeting abstracts of the Physical Society of Japan　66　(2)　381-381　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pJB-9 Nonlinear modulation of electric-field effects on magnetic anisotropy in the Fe/Au(001) surface.

Tsujikawa M, Miura Y, Shirai M, Oda T

Meeting abstracts of the Physical Society of Japan　66　(2)　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pJB-9 Nonlinear modulation of electric field effects on magnetic anisotropy in the Fe/Au(001) surface

Tsujikawa M, Miura Y, Shirai M, Oda T

Meeting abstracts of the Physical Society of Japan　66　(2)　935-935　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26aPS-43 A first-principles study on exchange coupling at interface of transition metal alloys and MgO

Miura Yoshio, Abe Kazutaka, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　66　(1)　494-494　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
半導体におけるスピン関連現象の物理と応用 (PASPS-VI)

Masafumi Shirai, Masaaki Tanaka

Solid State Physics　46　(2)　109-112　2011/02
Publisher: Agune Gijutsu Center
Fabrication and Properties of Novel Metal-free L10 Type FeNi Ordered Alloy with High Magnetic Anisotropy

Mizuguchi Masaki, Kojima Takayuki, Takanashi Koki, Kotsugi Masato, Shirai Masafumi

Materia Japan　50　(9)　389-392　2011
Publisher: The Japan Institute of Metals
DOI： 10.2320/materia.50.389 　

ISSN： 1340-2625
Materials Design for Creation of Spin Current

SHIRAI Masafumi

Materia Japan　49　(12)　562-565　2010/12/01
Publisher: The Japan Institute of Metals
DOI： 10.2320/materia.49.562 　

ISSN： 1340-2625
25aPS-62 Electronic structures of ferromagnetic shape memory alloy Ni_2Mn_<1+x>Sn_<1-x> studied by hard-x-ray photoelectron spectroscopy

Ye M., Kimura A., Miura Y., Shirai M., Cui Y. T., Shimada K., Namatame H., Taniguchi M., Ueda S., Kobayashi K., Kainuma R., Shishido T., Fukushima K., Kanomata T.

Meeting abstracts of the Physical Society of Japan　65　(2)　413-413　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pWX-1 磁気トンネル接合における界面ノンコリニア磁気構造とその電気伝導に関する理論研究(25pWX 領域9,領域3合同表面磁性,領域3(磁性,磁気共鳴))

三浦良雄, 阿部和多加, 白井正文

日本物理学会講演概要集　65　(2)　2010/08/18
Publisher: 社団法人日本物理学会
ISSN： 1342-8349
25pWX-1 Theoretical study on ballistic conductance of magnetic tunnel junctions with interfacial non-collinear magnetic structures

Miura Yoshio, Abe Kazutaka, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　65　(2)　428-428　2010/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Interface structure of half-metallic Heusler alloy Co2 MnSi thin films facing an MgO tunnel barrier determined by x-ray magnetic circular dichroism

Toshiaki Saito, Toshikazu Katayama, Takayuki Ishikawa, Masafumi Yamamoto, Daisuke Asakura, Tsuneharu Koide, Yoshio Miura, Masafumi Shirai

Physical Review B - Condensed Matter and Materials Physics　81　(14)　144417　2010/04/15

DOI： 10.1103/PhysRevB.81.144417 　

ISSN： 1098-0121 1550-235X
20aPS-27 A first-principles study on ballistic conductance of magnetic nanowires with a domain wall

Miura Yoshio, Abe Kazutaka, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　65　(1)　454-454　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pGL-3 Electric field effects on magnetic anisotropy of the perpendicular magnetized film covered with the dielectric material: from a first principles approach

Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi, Oda Tatsuki

Meeting abstracts of the Physical Society of Japan　65　(1)　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22pGL-3 Electric field effects on magnetic anisotropy of the perpendicular magnetized film covered with the dielectric material : from a first principles approach

Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi, Oda Tatsuki

Meeting abstracts of the Physical Society of Japan　65　(1)　953-953　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Materials Design for Creation of Spin Current

Shirai Masafumi

Bulletin of the Japan Institute of Metals　49　(12)　562-565　2010
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.49.562 　

ISSN： 1340-2625
25aRA-3 Electronic structures of Ni_2MnGa upon the martensitic phase transition studied by X-ray magnetic circular dichroism (XMCD)

Ye M., Cui Y. T., Miyamoto K., Kimura A., Namatame H., Taniguchi M., Takeda Y., Saitoh Y., Miura Y., Shirai M., Kanomata T.

Meeting abstracts of the Physical Society of Japan　64　(2)　320-320　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRA-9 Electric-field effects of magnetic anisotropy in a perpendicularly magnetized film covered by MgO.

Tsujikawa M, Miura Y, Shirai M, Oda T

Meeting abstracts of the Physical Society of Japan　64　(2)　334-334　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25pRA-9 Electric-field effects of magnetic anisotropy in a perpendicularly magnetized film covered by MgO

Tsujikawa M, Miura Y, Shirai M, Oda T

Meeting abstracts of the Physical Society of Japan　64　(2)　334-334　2009/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Absence of temperature dependence of the valence-band spectrum of Co2 MnSi

K. Miyamoto, A. Kimura, Y. Miura, M. Shirai, M. Ye, Y. Cui, K. Shimada, H. Namatame, M. Taniguchi, Y. Takeda, Y. Saitoh, E. Ikenaga, S. Ueda, K. Kobayashi, T. Kanomata

Physical Review B - Condensed Matter and Materials Physics　79　(10)　100405　2009/03/03

DOI： 10.1103/PhysRevB.79.100405 　

ISSN： 1098-0121 1550-235X
27aPS-103 Temperature dependence in electronic structure of half metal ferromagnetism Co_2MnSi

Miyamoto K, Kimura A, Miura Y, Shirai M, Cui Y, Ye M, Shimada K, Namatame H, Taniguchi M, Takeda Y, Saitoh Y, Ikenaga E, Ueda S, Kobayashi K, Kanomata T

Meeting abstracts of the Physical Society of Japan　64　(1)　437-437　2009/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Computational Design of Highly Spin Polarized Hetero Junction Between Heusler Alloys and MgO(Spin Electronics)

Miura Y, Abe K, Shirai M

Journal of the Magnetics Society of Japan　33　(2)　105-109　2009/03/01
Publisher: The Magnetics Society of Japan (MSJ)
DOI： 10.3379/msjmag.0901RE8062 　

ISSN： 1882-2924

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We investigate and discuss electronic structures and tunneling conductance of magnetic tunnel junctions (MTJs) with the Co_2CrGa and MgO on the basis of the density-functional first-principles calculations. We found that the CrGa-terminated Co_2CrGa/MgO (001) junction has no interface states and preserves the high spin-polarization of Co_2CrGa at the interface. We showed that the large enhancement of the interfacial Cr spin moment plays an important role to make the half-metallic gap in the CrGa-terminated Co_2CrGa/MgO(001) interface. Finally, we have proposed that addition of an ultrathin ...
20pQG-10 Electronic structures of Ni_<2-x>Co_xMnGa studied by x-ray photoemission spectroscopy

Ye M., Cui Y.T., Kimura A., Nakatake M., Shimada K., Namatame H., Taniguchi M., Okochi T., Saitoh Y., Ueda S., Kobayashi K., Miura Y., Shirai M., Kanomata T.

Meeting abstracts of the Physical Society of Japan　63　(2)　365-365　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
22aPS-132 Ab initio calculations of the magnetoresistance of half-metal/insulator heterostructures

Abe K, Miura Y, Shirai M

Meeting abstracts of the Physical Society of Japan　62　(2)　695-695　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pTA-13 Ab initio calculations of the tunneling magnetoresistance of Co_2CrAl/GaAs heterostructure

Nagao K, Miura Y, Shirai M

Meeting abstracts of the Physical Society of Japan　62　(1)　675-675　2007/02/28
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aZC-5 First-principles study of interfaces between half-metallic Heusler alloys and semiconductors

Nagao Kazutaka, Miura Yoshio, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　60　(1)　630-630　2005/03/04
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Materials design of half-metallic ferromagnets

Masafumi Shirai

Solid State Physics　39　(11)　861-866　2004/11
Publisher: Agne Gijutsu Center
ISSN： 0454-4544
Electronic structure calculations at Heusler-alloy/semiconductor interfaces

SHIRAI M, NAGAO K, MIURA Y

28　393-393　2004/09/21
12aYC-6 First-principles calculation of magneto-optical effects in zinc-blende CrAs

Shirai M, Miura Y, Nagao K, Kulatov E

Meeting abstracts of the Physical Society of Japan　59　(2)　585-585　2004/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aXR-4 Material design of novel two-dimensional half-metals using transition metal oxide nanosheets

Ono Kanta, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　59　(1)　485-485　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28aXR-5 First-principles calculation of zinc blende MAs(M=V,Cr,Mn) superlattices

Meeting abstracts of the Physical Society of Japan　59　(1)　485-485　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic structure calculations of highly spin-polarized Heusler alloys Co_2(Cr, Fe)Al

SHIRAI M, MIURA Y, NAGAO K

27　268-268　2003/09/01

ISSN： 1340-8100
Lattice-strain effect for zinc-blende CrAs and CrSb

Yamana K, Uchida I, Shirai M, Kusakabe K, Suzuki N

Meeting abstracts of the Physical Society of Japan　58　(2)　579-579　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Materials design of group-IV (Si, Ge) based ferromagnetic semiconductors from first-principles

Miura Y, Shirai M, Nagao K, Yoshida H

Meeting abstracts of the Physical Society of Japan　58　(2)　579-579　2003/08/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Theoretical Design of New Highly Spin-Polarized Ferromagnets

Shirai M

Journal of Magnetics Society of Japan　27　(6)　730-733　2003/06/01
Publisher: The Magnetics Society of Japan (MSJ)
ISSN： 0285-0192

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Highly spin-polarized materials have been attracting increasing interest, since they are expeded to improve the efficiency of magnetoelectronic (or spintronic) devices, such as magnetic sensors and magnetic random-access-memories. We explored theoretically new perfectly spin-polarized (so-called half-metallic) ferromagnets compatible with III-V semiconductors, using first-principles electronic band-structure calculations.The magnitude of the magnetic coupling and the degree of the spin-polarization at the highest occupied electronic energy-level (Fermi-level) were evaluated systematically f...
Materials design of ferromagnetic semiconductors by inhomogeneous doping

Araki K, Seike M, Shirai M, Sato K, Yoshida H

Meeting abstracts of the Physical Society of Japan　58　(1)　671-671　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Theory for Hydrogen Dynamics on Si(001)

Miura Y, Kasai H, Dino W. A, Nakanishi H, Shirai M, Okiji A

Meeting abstracts of the Physical Society of Japan　58　(1)　838-838　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Device-design based on highly spin-polarized magnets

Shirai M

Meeting abstracts of the Physical Society of Japan　58　(1)　606-606　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Growth and magnetic properties of half-metallic ferromagnet "zinc-blende CrAs thin film"

MIZUGUCHI M, AKINAGA H, MANAGO T, ONO K, OSHIMA M, SHIRAI M

26　26-26　2002/09/01

ISSN： 1340-8100
Spin-polarized electron injection from ferromagnet to semiconductor-How to make it efficient?

Akinaga H, Manago T, Mizuguchi M, Shirai M., Tarucha S., Honda M., Sato T.

Meeting abstracts of the Physical Society of Japan　57　(2)　576-576　2002/08/13
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Material Design and Synthesis of Half-Metallic Ferromagnets

Akinaga H, Mizuguchi M, Manago T, Ono K, Oshima M, Shirai M

Journal of Magnetics Society of Japan　26　(2)　67-72　2002/04/07
Publisher: The Magnetics Society of Japan (MSJ)
ISSN： 0285-0192

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A new class of half-metallic ferromagnets was found in the zinc-blende crystal structure. Zinc-blende ferromagnets, VAs, CrAs, and MnAs, were designed by using ab initio calculations based on local spin-density approximation, which predicts the highly spinpolarized electronic band structure. Successful molecular-beam-epitaxy growth of previously nonexistent zinc-blende CrAs thin films on GaAs (001) substrates was achieved. The photoemission spectra of the CrAs films are explained well by the theoretically predicted electronic band structure. The CrAs films show ferromagnetic behavior at roo...
Materials design and synthesis of half-metallic CrAs : Alloy Films

Manago Takashi, Mizuguchi Masaki, Akinaga Hiroyuki, Shirai Masafumi, Ono Kanta, Oshima Masaharu

Journal of Magnetics Society of Japan　26　(4)　441-444　2002/04/01
Publisher: The Magnetics Society of Japan (MSJ)
DOI： 10.3379/jmsjmag.26.441 　

ISSN： 0285-0192

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New half-metallic ferromagnets have been found in a zinc-blende crystal structure. The zinc-blende CrAs has been designed by ab initio calculations and the calculation predicts the highly spin-polarized electronic band structure. The zinc-blende CrAs thin film has been synthesized on GaAs (001) substrates by molecular-beam epitaxy. The film shows ferromagnetic behavior at room temperature and the magnetic moment per formula unit of CrAs is estimated to be about 3 μ_B, which agrees well with the theoretical prediction. The photoemission spectra of the CrAs film showed the Fermi edges indicat...
26pPSB-1 Exploring ferromagnetism in chalcopyrite magnetic semiconductorsbased on first-principles calculations

SHIRAI Masafumi, IKEUGHI Kazutomo

Meeting abstracts of the Physical Society of Japan　57　(1)　645-645　2002/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Material Design and Growth of "Zinc-Blende CrAs"

MIZUGUCHI Masaki, AKINAGA Hiro, MANAGO Takashi, ONO Kanta, OSHIMA Masaharu, SHIRAI Masafumi

2001　130-131　2001/09/25
A new 100% spin-polarized ferromagnet --- zinc-blende CrAs

Hiro Akinaga, Masaki Mizuguchi, Takashi Manago, Kanta Ono, Masaharu Oshima, Masafumi Shirai

Solid State Physics　36　(9)　587-592　2001/09/15
Publisher: Agne Gijutsu Center
Effects of Spin-Orbit Interaction on Half-Metallic Zinc-Blende Ferromagnets

Shirai M, Taguchi H, Ikeuchi K

Meeting abstracts of the Physical Society of Japan　56　(2)　338-338　2001/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Exploring ferromagnetism in zinc-blende transition-metal phosphides

SHIRAI Masafumi, IKEUCHI Kazutomo, TAGUCHI Hideki

Meeting abstracts of the Physical Society of Japan　56　(2)　527-527　2001/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
New half-metallic CrAs: material-design, synthesis and device-application

MANAGO T, MIZUGUCHI M, AKINAGA H, SHIRAI M, ONO K, OSHIMA M

25　111a-111b　2001/09/01

ISSN： 1340-8100
Growth and physical properties of multi-layers composed of zinc-blende CrAs

MIZUGUCHI M, AKINAGA H, MANAGO T, ONO K, OSHIMA M, SHIRAI M

25　267-267　2001/09/01

ISSN： 1340-8100
Electronic structures of spin-related functional materials

SHIRAI Masafumi

Bulletin of the Japan Society of Applied Physics　70　(3)　275-278　2001/03/10
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/oubutsu1932.70.275 　

ISSN： 0369-8009
DV-Xα Molecular Orbital Calculations for Electronic Structure and Magnetism of Mn-Zn Ferrites

XU Xun, SHIRAI Maszfumi, SUZUKI Naoshi

Meeting abstracts of the Physical Society of Japan　56　(1)　387-387　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic Bandstructures of MB_2C_2(M=La, Ca)

HARIMA H, SHIRAI M

Meeting abstracts of the Physical Society of Japan　56　(1)　501-501　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Mechanism of Ferromagnetism in Magnetic Semiconductors

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　56　(1)　604-604　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Photoemission study of the zinc-blende type CrAs

Mizuguchi M, Ono K, Akinaga H, Manago T, Yeom H. W, Chung Y. D, Okabayashi J, Mano T, Shirai M, Oshima M

Meeting abstracts of the Physical Society of Japan　56　(1)　608-608　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
First-Principles Materials Design of New Ferromagnetic Phases in III-V-based Diluted Magnetic Semiconductors

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　56　(1)　608-608　2001/03/09
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23pSB-8 III-V族希薄磁性半導体における新強磁性相の第一原理設計

白井正文

日本物理学会講演概要集　55　(2)　2000/09/10
Publisher: 社団法人日本物理学会
ISSN： 1342-8349
First-Principles Electronic Structure Calculations in III-V-based Diluted Magnetic Semiconductors. VI

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　55　(1)　561-561　2000/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
24aC-2 First-Principles Electronec Structure Calculations in III-V-bascd Diluted Magnetic Semiconductors.V

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　54　(2)　587-587　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pPSA-8 Electoric Band-Structure Calculations for the Intermediate State of the perovskite-type Compound Mn_3GaC III

SAITO Tatsuya, SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　54　(2)　410-410　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
26pPSA-18 Electronic Structure and Transport Phenomena in Ferromagnet/Non-magnetic Semiconductor Heterostructures

Narita K, Kubori N, Shirai M

Meeting abstracts of the Physical Society of Japan　54　(2)　413-413　1999/09/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29p-ZE-5 First-Principles Electronic Structure Calculations in III-V-based Diluted Magnetic Semiconductors

Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　54　(1)　152-152　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
28a-PS-80 Electronic Structure and Transport Phenomena in Ferromagnet : Non-magnetic Semiconductor Heterostructures

Narita Kenji, Oku Takashi, Kubori Nao, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　54　(1)　395-395　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29p-PSB-14 Electoric Band-Structure Calculations for the Intermediate State of the perovakite-type Compound Mn_3GaC

SAITO Tatsuya, SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　54　(1)　455-455　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
29p-PSB-20 Electronic structure and magnetic properties of MnGa/NiGa superlattice

Oku Takashi, Shirai Masafumi

Meeting abstracts of the Physical Society of Japan　54　(1)　456-456　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic Phase Transitions in Perovskite-type Compound Mn_3GaC and Related Materials

SHIRAI Masafumi, SAITO Tatsuya

Meeting abstracts of the Physical Society of Japan　53　(2)　471-471　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
First-Principles Electronic Structure Calculations in III-V-based Diluted Magnetic Semiconductors

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　53　(2)　198-198　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnetic Interactions in Ferromagnet/Semiconductor/Ferromagnet Heterostructures

SHIRAI M, OKU T, NARITA K, SUZUKI N

Meeting abstracts of the Physical Society of Japan　53　(2)　199-199　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic Structures and Magnetic Interactions in Zinc-Blende MnTe-MnSb Alloys

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　53　(1)　143-143　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
First-Principles Eletronic Structrure Calculations in III-V Based Magnetic Semiconductros II

OGAWA Takaki, OKU Takashi, KITAGAWA Isao, SHIRAI Masafumi, SUZUKI Naoshi

Meeting abstracts of the Physical Society of Japan　53　(1)　144-144　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic Structure and Magnetic Circuler Dichroism of NiAs-Type Transition Metal Compounds MnSb

TOKIOKA Y, SHIRAI M, SUZUKI N

Meeting abstracts of the Physical Society of Japan　53　(1)　390-390　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Effects of Electron Correlation and Limitation of Electron Band-Pictures

SHIRAI Masafumi

Meeting abstracts of the Physical Society of Japan　53　(1)　405-405　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Theoretical investigation of magnetic structure and hyperfine field of NaCl-type FeN

H Shimizu, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　67　(3)　922-926　1998/03

DOI： 10.1143/JPSJ.67.922 　

ISSN： 0031-9015
Electronic, structural and magnetic properties of transition-metal mononitrides

H Shimizu, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　66　(10)　3147-3152　1997/10

DOI： 10.1143/JPSJ.66.3147 　

ISSN： 0031-9015
8a-E-12 First-Principles Electronic Structure Calculations in III-V Based Diluted Magnetic Semiconductors

SHIRAI Masafumi, OGAWA Takaki, KITAGAWA Isao, SUZUKI Naoshi

Meeting abstracts of the Physical Society of Japan　52　(2)　185-185　1997/09/16
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
5p-PSB-19 Electornic Structure and Magneto-Optical Effect of NiAs-Type Transition Metal Compounds

Tokioka Y, Shirai M, Suzuki N

Meeting abstracts of the Physical Society of Japan　52　(2)　451-451　1997/09/16
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
30p-L-2 Electronic Structure of Antiferromagnetic Spinel Compounds CoM_2S_4(M:Co, Rh)

Miyazaki S, Shirai M, Suzuki N

Meeting abstracts of the Physical Society of Japan　52　(1)　484-484　1997/03/17
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Electronic Structure of C16-type Antiferromagnets MSn_2(M=Mn, Fe)

SHIRAI Masafumi

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1996　(3)　87-87　1996/09/13
Publisher: The Physical Society of Japan (JPS)
Electronic Structure and Magnetism of Sulphide Spinel Co_3S_4

Miyazaki S, Suzuki N, Shirai M

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1996　(3)　93-93　1996/09/13
Publisher: The Physical Society of Japan (JPS)
1P-PSA-67 Electronic structure YCo_5 : full-relativistic LMTO and FLAPW calculations.

Suzuki N., Kitagawa I., Kulatov E., Shirai M.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　168-168　1996/03/15
Publisher: The Physical Society of Japan (JPS)
1P-PSA-54 Electronic structure calculations of transition metal nitrides by the FLAPW method (II)

Shimizu N., Shirai M., Suzuki N.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　162-162　1996/03/15
Publisher: The Physical Society of Japan (JPS)
1P-PSA-53 Electronic Structures of TlCu_2X_2 (X = S, Se)

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　161-161　1996/03/15
Publisher: The Physical Society of Japan (JPS)
1p-YK-11 Investigation of high Tc Superconductivity Mechanism by Tunneling Spectroscopy

Aoki R., Murakami H., Akasako D., Seto M., Svistucov V. M., Dyachenko A. I., Afanassyev D. N.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　448-448　1996/03/15
Publisher: The Physical Society of Japan (JPS)
1p-YE-5 Spin-and angle-resolved photoemission study of itinerant ferramagnets: MnAs and MnSb

Shimada K., Kimura A., Rader O., Kamakura N., Ono K., Sendoha T., Fujimori A., Kakizaki A., Miyanishi S., Akinaga H., Akeura K., Tanaka M., Shirai M.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　132-132　1996/03/15
Publisher: The Physical Society of Japan (JPS)
Application of frozen-phonon method to lattice dynamics in FCC solid iodine

H Sakamoto, T Oda, M Shirai, N Suzuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　65　(2)　489-495　1996/02

DOI： 10.1143/JPSJ.65.489 　

ISSN： 0031-9015
PRESSURE EFFECTS ON ELECTRONIC-STRUCTURE AND ELECTRON-LATTICE INTERACTION OF CUBIC PHASE OF SOLID IODINE

H SAKAMOTO, M SHIRAI, N SUZUKI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　64　(10)　3860-3870　1995/10

DOI： 10.1143/JPSJ.64.3860 　

ISSN： 0031-9015
30p-K-11 First Principles Electronic State Calculation for Magnetic Phases of Organic Crystals

Kawamoto T, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1995　(2)　422-422　1995/09/12
Publisher: The Physical Society of Japan (JPS)
Electronic Structures and Magnetovolume effects of Transition-Metal-Platinum Ordered Alloys

Shirai Masafumi

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1995　(3)　27-27　1995/09/12
Publisher: The Physical Society of Japan (JPS)
Electronic structure of transition metal nitrides MN studied by the FLAPW method

Shimizu H, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1995　(3)　30-30　1995/09/12
Publisher: The Physical Society of Japan (JPS)
Electronic Band Structure and Magnetism in Fe_7S_8

Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　200-200　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Magnetic Phase Diagram of Cu_3Au-Type Ordered Alloys MPt_3 (M=V, Cr, Mn, Fe, Co)

Maeshima H, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　223-223　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Electronic Structure of Sulphide Spinels CuM_2S_4(M=Co, Rh, Ir)

Oda T, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　321-321　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Electron-Phonon Interaction, Lattice Dynamics and Superconductivity of Iodine under High Pressure

Sakamoto H, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　345-345　1995/03/16
Publisher: The Physical Society of Japan (JPS)
High Tc Copper Pairing Investigation by Tunneling Spectrum Observations (I)

Aoki R, Murakami H, Nishio Y, Shirai M, Svistunov V.M, Dyachenko A.I, Afanassyev D.N

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　381-381　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Time-Resolved Spectroscopic Study on the Type I Self-Trapped Excitons in Alkali Halide Crystals : II. Excitation Spectra and Relaxation Processes

Matsumoto Tamao, Shirai Masanobu, Kan'no Ken-ichi

Journal of the Physical Society of Japan　64　(3)　987-1001　1995/03/15
Publisher: The Physical Society of Japan (JPS)
DOI： 10.1143/JPSJ.64.987 　

ISSN： 0031-9015

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Excitation spectra for the fluorescent and phosphorescent components of type I bands in seven alkali halides, NaCl, NaBr, KBr, RbBr, NaI, KI and RbI, are measured in both energy ranges of the free exciton absorption and the band-to-band transition. Using SR pulses as the excitation light source, the two components are resolved by the method of simultaneous photon-counting through two independent time-windows. Excitation spectra for the phosphorescent bands of type II or III are also measured for comparison. From these spectra, total luminescence yield and the fraction of the type I band are...
Correlation between the Spin State and Structure of Self-Trapped Excitons in Alkali Halides

Matsumoto Tamao, Shirai Masanobu, Kan'no Ken-ichi

Journal of the Physical Society of Japan　64　(1)　291-301　1995/01/15
Publisher: The Physical Society of Japan (JPS)
DOI： 10.1143/JPSJ.64.291 　

ISSN： 0031-9015

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In order to clarify the origin of the preferential relaxation of singlet self-trapped excitons (STEs) into the on-center configuration in alkali halides, we have studied variation of exchange splitting energy along the relaxation path from the on-center to the off-center configurations using a simple phenomenological model. Estimated exchange energy is several tens of meV both at the on-center and off-center configurations, and takes its maximum in between. It provides a larger potential barrier intervening between the on- and off-center minima for the singlet STE than that for the triplet ...
3p-PSA-31 Pressure Effects on Electronic Structure of MnZnSb

Maeshima H, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(3)　105-105　1994/08/16
Publisher: The Physical Society of Japan (JPS)
3a-PS-13 Electron-Phonon Interaction and Superconductivity of Iodine under High Pressure

Sakamoto H, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(3)　274-274　1994/08/16
Publisher: The Physical Society of Japan (JPS)
4p-YD-4 Electrinic Structure, Electron-Phnono Interaction and Superconductivity of Spinel-type Compounds

Oda T, Shirai M, Suzuki N, Mochizuki K

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(3)　360-360　1994/08/16
Publisher: The Physical Society of Japan (JPS)
30p-PSA-22 Electronic structure, magnetic phase diagram and ferromagnetic order of organic molecular crystals

Kawamoto T, Suzuki N, Shirai M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　49　(3)　148-148　1994/03/16
Publisher: The Physical Society of Japan (JPS)
30p-PSB-32 Magnetic and Optical properties in NiAs-type transition metal (Fe, Co) chalcogenides

Ikeda H, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　49　(3)　179-179　1994/03/16
Publisher: The Physical Society of Japan (JPS)
28p-YF-9 The Effect of Anisotropy on Superconductivity in Layered Transition-Metal Dichalcogenide NbS_2

Nishio Y, Shirai M, Suzuki N

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　49　(3)　316-316　1994/03/16
Publisher: The Physical Society of Japan (JPS)
ROLE OF ELECTRON-LATTICE INTERACTION IN LAYERED TRANSITION-METAL DICHALCOGENIDE 2H-NBS2 .1. PHONON ANOMALY AND SUPERCONDUCTIVITY

Y NISHIO, M SHIRAI, N SUZUKI, K MOTIZUKI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　63　(1)　156-167　1994/01

DOI： 10.1143/JPSJ.63.156 　

ISSN： 0031-9015
13p-PSA-4 The magnetic-dipole interaction and magnetic anisotoropy of organic molecular crystals.

Kawamoto T, Suzuki N, Shirai M

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(3)　72-72　1993/09/20
Publisher: The Physical Society of Japan (JPS)
15a-PS-31 Electronic band structure and Magnetism in Fe_7Se_8, Co_7Se_8

Ikeda H, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(3)　199-199　1993/09/20
Publisher: The Physical Society of Japan (JPS)
12a-D-3 Theoretical Study of Superconductivity and Transport Phenomena in Layered Material NbS_2 II.

Nishio Y, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(3)　286-286　1993/09/20
Publisher: The Physical Society of Japan (JPS)
12p-D-4 Electron-Phonon Interaction and Superconductivity of Oxide Spinel LiTi_2O_4

Oda T, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(3)　291-291　1993/09/20
Publisher: The Physical Society of Japan (JPS)
29p-M-6 Electron-Lattice Interaction in the Three Dimensional Mixed-Valence Compounds Cs_2Au_2X_6(X=Cl,Br,I)

Saito Akihiko, Shirai Masafumi

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(2)　188-188　1993/03/16
Publisher: The Physical Society of Japan (JPS)
1a-R-1 Electronic Structure and Ferromagnetic-Antiferromagnetic Transition in Cubic Perovskite-Type Conpound Mn_3GaC

Ohata Y, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(3)　134-134　1993/03/16
Publisher: The Physical Society of Japan (JPS)
1a-PS-4 Pressure Effect on Electronic Structure of Cu_2Sb-type Transition Metal Compound Mn_2Sb

Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(3)　147-147　1993/03/16
Publisher: The Physical Society of Japan (JPS)
1a-PS-5 Electronic states and Magnetic properties in Cu_3Au-type ordered alloys MPt_3(M=Cr,Mn,Fe,Co) and FePd_3

Suda T, Maeshima H, Shirai M, Suzuki N, Motizuki K

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(3)　148-148　1993/03/16
Publisher: The Physical Society of Japan (JPS)
PRESSURE EFFECTS ON ELECTRONIC-STRUCTURE AND MAGENTISM OF CU2SB-TYPE COMPOUND MN2SB

N SUZUKI, K YOSHIDA, M SHIRAI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(3)　245-247　1993

ISSN： 0021-4922
ELECTRONIC-STRUCTURE AND FERROMAGNETIC-ANTIFERROMAGNETIC TRANSITION IN CUBIC PEROVSKITE-TYPE COMPOUND MN3GAC

M SHIRAI, Y OHATA, N SUZUKI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(3)　250-252　1993

ISSN： 0021-4922
ELECTRONIC-STRUCTURE AND MAGNETIC AND OPTICAL-PROPERTIES OF NIAS-TYPE TRANSITION-METAL CHALCOGENIDES MX (M=FE, CO - X=S, SE)

H IKEDA, M SHIRAI, N SUZUKI, K MOTIZUKI

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　32　(3)　301-303　1993

ISSN： 0021-4922
25p-PSA-27 Electronic Band Structure of Cu_2Sb-type Transition Metal Compounds. Cr_2As, Mn_2As and Fe_2As

Kawamoto T, Tomita N, Matsumura H, Shirai M, Motizuki K

1992　(3)　47-47　1992/09/14
Publisher: The Physical Society of Japan (JPS)
25p-PSA-39 Electronic Band Structure and Magnetism in NiAs-type chalcogenide MX(M=Fe, Co;X=S, Se)

Ikeda H, Konno K, Shirai M, Motizuki K

1992　(3)　53-53　1992/09/14
Publisher: The Physical Society of Japan (JPS)
26p-N-8 Pressure Effect on Electronic Structure of Cu_2Sb-type Transition Metal Compund Mn_2Sb

YOSHIDA Keiichi, SHIRAI Masafumi, SUZUKI Nao, MOCHIZUKI Kazuko

1992　(3)　105-105　1992/09/14
Publisher: The Physical Society of Japan (JPS)
26p-N-10 Electronic States and Magnetic and Optical Properties of Cu_3Au-Type Fe-Pt and Fe-Pd Ordered Alloys

SUDA Tetsuji, SAITO Akihiko, OHATA Yoshihumi, SHIRAI Masafumi, MOCHIZUKI Kazuko, SUZUKI nao

1992　(3)　106-106　1992/09/14
Publisher: The Physical Society of Japan (JPS)
28a-P-4 Superconducting and Transport Properties of Layered Material 2H-NbS_2

Nishio Y, Shirai M, Motizuki K, Suzuki N

1992　(3)　404-404　1992/09/14
Publisher: The Physical Society of Japan (JPS)
30a-PS-71 Cu_2Sb型遷移金属化合物MnZnSbの電子帯構造と磁性

鈴木正勝, 白井正文, 望月和子

年会講演予稿集　47　(3)　129-129　1992/03/12
Publisher: 社団法人日本物理学会
28p-PS-111 Electron-Phonon Interaction and Superconductivity in High-Tc Oxide Superconductors La<2-x>Sr_xCuO_4

Shirai M, Motizuki K

47　(3)　323-323　1992/03/12
Publisher: The Physical Society of Japan (JPS)
28p-PS-112 Electron-Phonon Interaction and superconductivity in LiTi_2O_4

Oda T, Shirai M, Motizuki K

47　(3)　324-324　1992/03/12
Publisher: The Physical Society of Japan (JPS)
A Role of Electron-Phonon Interaction in Oxide Superconductors : IV-B Superconductivity : IV Mechanisms of Superconductivity; Theory

MOTIZUKI Kazuko, SHIRAI Masafumi, SUZUKI Naoshi

JJAP series　7　358-364　1992/02/29
Publisher: The Japan Society of Applied Physics
ISSN： 0914-9090
27a-APS-34 Electronic Band Structure and Magnetism in Cu_2Sb-type Transition Metal Compound Mn_2Sb

Suzuki M, Shirai M, Motizuki K

46　(3)　39-39　1991/09/12
Publisher: The Physical Society of Japan (JPS)
Electron-Phonon Interaction and Lattice Dynamics : Focusing on the Superconductivity of Ba_xK_<1-x>BiO_3

Motizuki Kazuko, Shirai Masahumi

Bulletin of the Physical Society of Japan　46　(9)　758-765　1991/09/05
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/butsuri1946.46.758 　

ISSN： 0029-0181
27p-M-11 Electronic State of the One-Dimensional [Cu_4S_4]_∞ Chain in Na_3Cu_4S_4 and K_2Cu_8S_6, etc.

Sato H, Kojima N, Shirai M

1991　(2)　188-188　1991/03/11
Publisher: The Physical Society of Japan (JPS)
24p-ZA-11 Electronic Band Structures of Mixed Valent Compounds Cs_2Au_2X_6(X=Cl, Br, I)

Shirai Masafumi

1991　(2)　330-330　1991/03/11
Publisher: The Physical Society of Japan (JPS)
27p-PS-38 Lattice Dynamics and Electron-Lattice Interaction of high-Tc Superconductor La_<2-x>M_xCuO_4(M=Sr, Ba)

Kinoshita T, Shirai M, Motizuki K

1991　(3)　349-349　1991/03/11
Publisher: The Physical Society of Japan (JPS)
Electron-Phonon Interaction and Lattice Dynamics in 2H-NbS_2

Nishio Y, Shirai M, Motizuki K

45　(2)　166-166　1990/03/16
Publisher: The Physical Society of Japan (JPS)
31a-PS-72 BaPb_<1-x>Bi_xO_3およびBa_<1-x>K_xBiO_3の電子-格子相互作用と超伝導(低温(酸化物超伝導))

白井正文, 望月和子

年会講演予稿集　44　(3)　242-242　1989/03/28
Publisher: 一般社団法人日本物理学会
3a-PS-18 BaPb_<1-x>Bi_xO_3の電子格子相互作用と格子振動および超伝導(低温(酸化物超伝導体))

白井正文, 鈴木直, 望目和子

年会講演予稿集　43　(3)　296-296　1988/03/18
Publisher: 一般社団法人日本物理学会
Electron-Lattice Interaction, Lattice Dynamics and Superconductivity in BaPb_<1-x>Bi_xO_3 : IV. Theories :

Masafumi Shirai, Naoshi Suzuki, Kazuko Motizuki

JJAP series　1　255-257　1988
Publisher: Japanese Journal of Applied Physics
29p-PS-32 BaPb_<1-x>Bi_xO_3の電子 : 格子相互作用と格子振動

白井正文, 鈴木直, 望月和子

秋の分科会講演予稿集　1987　(3)　293-293　1987/09/16
Publisher: 社団法人日本物理学会
29p-CA-5 BaPb_<1-x>Bi_xO_3の電子-格子相互作用と超伝導(低温)

白井正文, 鈴木直, 望月和子

年会講演予稿集　41　(3)　211-211　1986/03/29
Publisher: 一般社団法人日本物理学会
1a-PS-34 種々のNiAs型化合物の電子帯構造(磁性ポスターセッション(人工格子・強磁場・Laves相・磁気測定))

加藤敬子, 白井正文, 望月和子

年会講演予稿集　40　(3)　124-124　1985/03/31
Publisher: 一般社団法人日本物理学会
2a-B-3 変形三角格子磁性体の磁気励起

白井正文, 鈴木直

秋の分科会講演予稿集　1984　(3)　80-80　1984/09/10
Publisher: 社団法人日本物理学会
1a-KM-3 RbFeBr_3型変形三角格子の磁気相図

白井正文, 山口哲朗, 鈴木直

年会講演予稿集　39　(3)　93-93　1984/03/12
Publisher: 社団法人日本物理学会

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Books and Other Publications 10

Spintronics - Basics and Forefront of Materials and Applications <<Popular Edition>>

Masafumi Shirai

CMC Publishing　2015/08/10

ISBN: 9784781310268

More details Close

監修高梨弘毅
密度汎関数法の発展マテリアルデザインへの応用

白井正文, 佐藤和則

Springer Japan　2011/09/19

ISBN: 9784431102540
機能材料としてのホイスラー合金

白井正文

内田老鶴圃　2011/05

ISBN: 9784753651344
エネルギー科学における多階層連結コンピューティング

白井正文

財団法人国際高等研究所　2011/03/31

ISBN: 9784906671854
Spintronics - Basic and Application

Masafumi Shirai

CMC Publishing　2010/01/20

ISBN: 9784781301624
Spintronics - Basics and Forefront of Materials and Applications

Masafumi Shirai

CMC Publishing　2009/06/30

ISBN: 9784781301051
Epitaxial Ferromagnetic Films and Spintronic Applications

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

Research Signpost　2009

ISBN: 9788130803197
Half-metallic Alloys: Fundamentals and Applications

Hiro Akinaga, Masaki Mizuguchi, Kazutaka Nagao, Yoshio Miura, Masafumi Shirai

Springer-Verlag　2005

ISBN: 3540277196
Spintronics - Basic and Forefront

Masafumi Shirai

CMC Publishing　2004/07/30

ISBN: 488231455X
Recent Advances in Magnetism of Transition Metal Compounds

Masafumi Shirai, Kazuko Motizuki

World Scientific Publishing　1993

ISBN: 9810211503

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Presentations 146

Giant interfacial magnetoelectric effect and transport properties in Fe₄N/BaTiO₃/Fe magnetic tunnel junctions International-presentation

So Kumata, Masahito Tsujikawa, Masafumi Shirai

15th RIEC International Workshop on Spintronics and 6th JSPS Core-to-Core Workshop on “New-Concept Spintronics Devices”　2017/12/13
X-ray magnetic circular dichroism spectroscopy to study the microscopic origin of voltage-induced magnetic anisotropy in ferromagnetic metal/MgO interfaces International-presentation

Motohiro Suzuki, Masahito Tsujikawa, Takayuki Nozaki, Takuya Tsukahara, Takeshi Kawabe, Koki Shimose, Taishi Furuta, Risa Miyakaze, Kohei Yoshikawa, Kohei Nawaoka, Minori Goto, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Tadakatsu Ohkubo, Kazuhiro Hono, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki, Shinji Miwa

4th International Symposium on Advanced Magnetic Materials and Applications　2017/12/10
Voltage control of interfacial magnetic anisotropy, Dzyaloshinskii-Moriya interaction and exchange coupling in Fe/MgO-based artificial multilayers International-presentation

Shinji Miwa, Kohei Nawaoka, Jaehun Cho, Takayuki Nozaki, Motohiro Suzuki, Masahito Tsujikawa, Minori Goto, Frédéric Bonell, Eiiti Tamura, Hitoshi Kubota, Shingo Tamaru, Kei Yakushiji, Akio Fukushima, Yoshinori Kotani, Tetsuya Nakamura, Masafumi Shirai, Tadakatsu Ohkubo, Kazuhiro Hono, C.-Y. You, Shinji Yuasa, Yoshishige Suzuki

2017 MRS Fall Meeting & Exhibit　2017/11/26
Giant modulation of magnetization induced by electric polarization reversal at Fe₄N/BaTiO₃ interface International-presentation

So Kumata, Masahito Tsujikawa, Masafumi Shirai

62nd Annual Conference on Magnetism and Magnetic Materials　2017/11/06
Theoretical design of Mn-based ordered alloys with high magnetization by lattice expansion International-presentation

Yuito Mitsuhashi, Masahito Tsujikawa, Masafumi Shirai

62nd Annual Conference on Magnetism and Magnetic Materials　2017/11/06
Unveiling reentrant martensitic phase transition mechanism in Co₂Cr(Ga,Si) Heusler alloys International-presentation

Kazuki Sumida, Masahito Tsujikawa, Xiao Xu, Jiahua Chen, Siyuan Zhu, Tomoki Yoshikawa, Sota Higaki, Shigenori Ueda, Yukiharu Takeda, Yuji Saitoh, Masafumi Shirai, Ryosuke Kainuma, Akio Kimura

Yamada Science Foundation Junjiro Kanamori Memorial International Symposium: New Horizon of Magnetism　2017/09/27
Microscopic origin of voltage-controlled magnetic anisotropy in ferromagnetic thin-film metals International-presentation

Shinji Miwa, Motohiro Suzuki, Masahito Tsujikawa, Takayuki Nozaki, Takuya Tsukahara, Takeshi Kawabe, Kohei Yoshikawa, Kohei Nawaoka, Minori Goto, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Tadakatsu Ohkubo, Kazuhiro Hono, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

3rd ImPACT International Symposium on Spintronic Memory, Circuit and Storage　2017/09/23
Huge voltage-induced magnetic anisotropy change in the 5d transition-metal monolayer on the Fe and Co surface International-presentation

Masahito Tsujikawa, Masafumi Shirai

3rd ImPACT International Symposium on Spintronic Memory, Circuit and Storage　2017/09/23
Huge electric-field-induced magnetic anisotropy of the 5d transition-metal monolayers on Fe(001) and Co(0001) International-presentation

Masahito Tsujikawa, Masafumi Shirai

28th Magnetic Recording Conference　2017/08/02
Recent progress in voltage-controlled magnetic anisotropy: Towards the realization of voltage-torque MRAM International-presentation

Takayuki Nozaki, Yoichi Shiota, Anna Koziol-Rachwal, Masahito Tsujikawa, Xiandong Xu, Tadakatsu Ohkubo, Takuya Tsukahara, Shinji Miwa, Motohiro Suzuki, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Kazuhiro Hono, Masafumi Shirai, Yoshishige Suzuki

28th Magnetic Recording Conference　2017/08/02
Ab initio caclucation of electric-field effect on magnetic anisotropy at Fe/MgO interfaces: The role of lattice distortion International-presentation

York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”　2017/06/21
Electric-field control of magnetic anisotropy in Cu/Co/Pd layers: Ab initio calculation International-presentation

York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”　2017/06/21
Enhancement of voltage effect on magnetic anisotropy in ferromagnetic thin films International-presentation

Masafumi Shirai

York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”　2017/06/21
Magnetic anisotropy and magnetic damping in hexagonal Co/Ni multilayers International-presentation

Masahito Tsujikawa, Masafumi Shirai

York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”　2017/06/21
Huge voltage-induced magnetic anisotropy change of 5d transition-metals on Fe(001) and Co(0001) International-presentation

Masahito Tsujikawa, Masafumi Shirai

IEEE International Magnetics Conference 2017　2017/04/24
Enhancement of magnetization in Mn-Ga alloys doped with typical elements: A first-principles study International-presentation

Masahito Tsujikawa, Masafumi Shirai

IEEE International Magnetics Conference 2017　2017/04/24
Enhancement of voltage-controlled magnetic anisotropy by 5d transition-metal monolayer on ferromagnetic thin films International-presentation

Masafumi Shirai

Spintronics and Core-to-Core Workshop 2017　2017/03/20
Electric field dependence of magnetic damping of Fe-layer: A first-principles study International-presentation

Yoshio Miura, Masahito Tsujikawa, Masafumi Shirai

61st Annual Conference on Magnetism and Magnetic Materials　2016/10/31
Voltage control of platinum orbit: Contribution to interfacial magnetic anisotropy change International-presentation

Shinji Miwa, Motohiro Suzuki, Masahito Tsujikawa, Kensho Matsuda, Takayuki Nozaki, Kazuhito Tanaka, Minori Goto, Yoshinori Kotani, Tadakatsu Ohkubo, Frédéric Bonell, Eiiti Tamura, Kazuhiro Hono, Tetsuya Nakamura, Masafumi Shirai, Yoshishige Suzuki

61st Annual Conference on Magnetism and Magnetic Materials　2016/10/31
First-principles study on the magnetostructural phase transitions of Co-based Heusler alloys International-presentation

Masahito Tsujikawa, Shun Kano, Masafumi Shirai

5th International Conference on Ferromagnetic Shape Memory Alloys　2016/09/05
First-principles calculation of electronic structure in NiMnSb/MgO and CoMnSb/MgO junctions International-presentation

Masafumi Shirai, Akira Onodeta, Masahito Tsujikawa, Yoshio Miura

4th International Conference of Asian Union of Magnetics Societies　2016/08/01
First-principles study on the magnetic anisotropy and magnetic damping in hexagonal Fe/Co, Co/Ni, Fe/Ni multilayers International-presentation

Masahito Tsujikawa, Takuya Ito, Masafumi Shirai

9th International Symposium on Metallic Multilayers　2016/06/19
Ab initio study on magnetic tunnel junctions using Heusler alloys International-presentation

Masafumi Shirai

International Workshop on Computational Nano-Materials Design and Realization for Energy-Saving and Energy-Creation Materials　2016/03/25
Electronic structure and magnetic properties of Mn3Ga doped with Ti, V, and Cr: A first-principles study International-presentation

M. Tsujikawa, M. Shirai

2016 Joint Magnetism and Magnetic Materials/International Magnetics Conference　2016/01/11
Electronic structure at interfaces between Heusler alloys and MgO International-presentation

Masafumi Shirai

13th RIEC International Workshop on Spintronics　2015/11/18
The effect of light-element doping on magnetic anisotropy in L1₀-FeNi: A first-principles study International-presentation

Masahito Tsujikawa, Masafumi Shirai

ESICMM-G8 Symposium on Next Generation Permanent Magnets　2015/06/18
Theoretical design of electrode materials for magnetic tunnel junctions with MgO barrier: Ferrimagnetic D0₂₂-type Mn-based Heusler alloys International-presentation

Masafumi Shirai

York-Tohoku-Kaiserslautern Research Symposium on New-Concept Spintronics Devices　2015/06/11
Electronic structures of L1₀-ordered FeNi thin films studied by photoelectron spectroscopy International-presentation

Masaki Mizuguchi, Shigenori Ueda, Yoshio Miura, Takayuki Kojima, Masafumi Shirai, Koki Takanashi

59th Annual Conference on Magnetism and Magnetic Materials　2014/11/03
Effect of nonstoichiometry on the half-metallicity of Co₂(Mn,Fe)Si thin films investigated through saturation magnetization International-presentation

Kidist Moges, Yusuke Honda, Tetsuya Uemura, Masafumi Yamamoto, Yoshio Miura, Masafumi Shirai

59th Annual Conference on Magnetism and Magnetic Materials　2014/11/03
Detection of spin-resolved electronic structures from a buried ferromagnetic layer utilizing forward Mott scattering International-presentation

Shigenori Ueda, Masaki Mizuguchi, Takayuki Kojima, Satoshi Ishimaru, Masahito Tsujikawa, Masafumi Shirai, Koki Takanashi

59th Annual Conference on Magnetism and Magnetic Materials　2014/11/03
Theoretical studies on spin-dependent transport phenomena in heterostructures based on half-metallic Heusler alloys International-presentation

Yoshio Miura, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2014/10/30
First-principles study on electric-field modulation of interfacial magnetic anisotropy International-presentation

Masafumi Shirai

2nd Japan-EU Open Workshop on Heusler Alloy Replacement for Iridium　2014/09/12
Perpendicular magnetic anisotropy in MgO/Co-based Heusler alloy junctions: A first-principles study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

15th IUMRS International Conference in Asia　2014/08/24
Electric-field control of the perpendicular magnetic anisotropy at ferromagnet/oxide interfaces: A first-principles study International-presentation

Masahito Tsujikawa, Masafumi Shirai

International Workshop of Computational Nano-Materials Design on Green Energy, Joint Workshop of Center of Asia Research and Education Network, Osaka University and JSPS Core-to-Core Program (A) Advanced Research Network　2014/06/01
A first-principles study on electronic structures and transport properties of magnetic tunnel junctions with D0₂₂-type Mn-based tetragonal Heusler alloys International-presentation

Yoshio Miura, Satoru Tanibayashi, Masafumi Shirai

International Workshop of Computational Nano-Materials Design on Green Energy, Joint Workshop of Center of Asia Research and Education Network, Osaka University and JSPS Core-to-Core Program (A) Advanced Research Network　2014/06/01
214. Magneto-crystalline anisotropy of L1₀-ordered FeNi alloy: A first-principles study International-presentation

Masafumi Shirai

US-Japan Bilateral 1st Meeting on Rare Metals　2014/05/20
New approach to spin-resolved photoemission using hard x-rays: Electronic and magnetic states of an FeNi film buried under a Au thin film International-presentation

Shigenori Ueda, Masaki Mizuguchi, Takayuki Kojima, Satoshi Ishimaru, Masahito Tsujikawa, Masafumi Shirai, Koki Takanashi, Osami Sakata

58th Annual Conference on Magnetism and Magnetic Materials　2013/11/04
Electronic and magnetic states of L1₀ ordered FePt thin film International-presentation

Shigenori Ueda, Masaki Mizuguchi, Jun Goo Kang, Yoshio Miura, Masafumi Shirai, Koki Takanashi

International Conference on Nanoscale Magnetism 2013　2013/09/02
The influence of Co and B atoms on the perpendicular magnetic anisotropy of MgO/CoFeB film International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

3rd International Symposium on Advanced Magnetic Materials and Applications　2013/07/21
Theoretical study on tunneling magnetoresistance of manetic tunnel junctions with D0)₂₂-Mn₃Z (Z = Ga, Ge) International-presentation

Yoshio Miura, Masafumi Shirai

3rd International Symposium on Advanced Magnetic Materials and Applications　2013/07/21
Theoretical studies on spin-dependent transport phenomena in heterostructures based on half-metallic Heusler alloys International-presentation

Yoshio Miura, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2013/07/04
Theoretical study on spin-dependent transport properties in magnetic tunnel junctions with Fe₄N electrodes International-presentation

MinYan Zhou, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2013/07/04
A first-principles study on magnetic anisotropy of L1₁-ordered CoNi International-presentation

Takuya Ito, Masahito Tsujikawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2013/07/04
First-principles study on the magnetocrystalline anisotropy of Co-based Heusler alloys International-presentation

Shun Kano, Masahito Tsujikawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2013/07/04
Computational study on transport properties of single molecule junction with magnetic electrodes International-presentation

Akira Onodera, Satoru Tanibayashi, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2013/07/04
Electronic structure of L1₀ ordered FePt thin film International-presentation

Shigenori Ueda, Masaki Mizuguchi, Jun Goo Kang, Yoshio Miura, Masafumi Shirai, Koki Takanashi

5th International Conference on Hard X-ray Photoelectron Spectroscopy　2013/06/17
Ab inito study on magneto-crystalline anisotropy in Co-Fe/MgO junctions International-presentation

Masafumi Shirai, Masahito Tsujikawa, Yoshio Miura

International Workshop of Computational Nano-Materials Design on Green Energy, Joint Workshop of Interactive Materials Science Cadet Program, Osaka University and JSPS Core-to-Core Program (A) Advanced Research Network　2013/06/16
A first-principles study on magneto-crystalline anisotropy at interfaces of Fe with various non-magnetic metals International-presentation

Yoshio Miura, Masahito Tsujikawa, Masafumi Shirai

International Workshop of Computational Nano-Materials Design on Green Energy, Joint Workshop of Interactive Materials Science Cadet Program, Osaka University and JSPS Core-to-Core Program (A) Advanced Research Network　2013/06/16
First-principles study on magneto-crystalline anisotropy at Co-Fe-Al/MgO interfaces International-presentation

Masafumi Shirai, Masahito Tsujikawa, Yoshio Miura

JSPS York-Tohoku Symposium on Magnetic Materials and Spintronic Devices　2013/06/10
Perpendicular magnetic anisotropy and its electrical modulation of MgO/Co₂FeAl interface: A first-principles study International-presentation

Masahito Tsujikawa, Daiki Mori, Yoshio Miura, Masafumi Shirai

Yamada Conference LXVII - 8th International Symposium on Metallic Multilayers　2013/05/19
A first-principles study on magnetic anisotropy of Fe/Ni multilayers International-presentation

Sho Ozaki, Masahito Tsujikawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Yamada Conference LXVII - 8th International Symposium on Metallic Multilayers　2013/05/19
Perpendicular magnetic anisotropy in artificially fabricated L1₀-FeNi thin films International-presentation

Masaki Mizuguchi, Takayuki Kojima, Sho Ozaki, Yoshio Miura, Masafumi Shirai, Koki Takanashi

Yamada Conference LXVII - 8th International Symposium on Metallic Multilayers　2013/05/19
Half-metallic Heusler alloys for magnetoresistive devices: An outlook based on ab initio calculations International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

Special Session of International Symposium of Computational Science & Topical Meeting of CMSI on Spintronics: First-principles Simulation and Measurement　2013/02/18
The role of B and Co in the perpendicular magnetic anisotropy of CoFeB/MgO interface: A first-principles study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

3rd CSIS International Symposium on Spintronics-based VLSIs and 11th RIEC International Workshop on Spintronics　2013/01/31
Giant magneto-crystalline anisotropy in hexagonal FeNi alloys: A first-principles study International-presentation

Sho Ozaki, Masahito Tsujikawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

12th Joint Magnetism and Magnetic Materials/International Magnetics Conference　2013/01/14
Computational design of barrier materials in magnetic tunnel junctions with iron-nitride electrodes International-presentation

Masafumi Shirai, MinYan Zhou, Eriko Nagata, Yoshio Miura, Kazutaka Abe

Core-to-Core Groningen Workshop 2012 on Spintronics and Moltronics　2012/11/18
A first-principles study on spin-dependent tunneling conductance in magnetic tunnel junctions with spinel-type barrier International-presentation

Yoshio Miura, Shingo Muramoto, Kazutaka Abe, Masafumi Shirai

Core-to-Core Groningen Workshop 2012 on Spintronics and Moltronics　2012/11/18
Ab initio studies on half-metallic Heusler alloys: An outlook toward room-temperature applications International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

International Conference of the Asian Union of Magnetics Societies　2012/10/02
Spin-dependent transport properties in magnetic tunnel junctions with Fe₄N electrodes: A first-principles study International-presentation

Eriko Nagata, MinYan Zhou, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Conference of the Asian Union of Magnetics Societies　2012/10/02
Magneto-crystalline anisotropy at interfaces of Fe and non-ferromagnetic metals: A first-principles study International-presentation

Yoshio Miura, Masahito Tsujikawa, Masafumi Shirai

International Conference of the Asian Union of Magnetics Societies　2012/10/02
A first-principles study on spin-dependent tunneling conductance in magnetic tunnel junctions with spinel-type MgAl₂O₄ barrier International-presentation

Yoshio Miura, Shingo Muramoto, Kazutaka Abe, Masafumi Shirai

19th International Conference on Magnetism with Strongly Correlated Electron Systems　2012/07/08
Interfacial magnetic anisotropy of junctions between Fe and transition-metal nitrides or carbides: A first-principles study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

19th International Conference on Magnetism with Strongly Correlated Electron Systems　2012/07/08
Interface material effects on magnetic anisotropy and its electric field induced variation in thin films International-presentation

Yusaku Taguchi, Haruki Kato, Shinya Haraguchi, Masahito Tsujikawa, Masafumi Shirai, Tatsuki Oda

19th International Conference on Magnetism with Strongly Correlated Electron Systems　2012/07/08
Theoretical studies on spin-dependent transport phenomena in heterostructures based on half-metallic Heusler alloys International-presentation

Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2012/07/04
First-principles calculations of electronic and magnetic properties of multiferroic oxides Co-doped BiFeO₃ International-presentation

Yuichiro Matsuzawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2012/07/04
Interface magnetic anisotropy of Fe/transition-metal nitride (carbide) International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

Annual Meeting of Strategic Japanese-German Joint Research Program “ASPIMATT”: Advanced Spintronic Materials and Transport Phenomena　2012/07/04
Ab initio study on half-metallic ferromagnets for non-volatile memory applications International-presentation

Masafumi Shirai

International Workshop on Nano-Spintronics and JSPS Core-to-Core Program Kick-Off Meeting　2012/06/29
Magnetic anisotropy and its electric field effect of MgO/FeCo interfaces: A first principles study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

9th RIEC International Workshop on Spintronics　2012/05/31
A first-principles study on magneto-crystalline anisotropy at interfaces of magnetic tunnel junctions International-presentation

Yoshio Miura, Daiki Mori, Masahito Tsujikawa, Kazutaka Abe, Masafumi Shirai

9th RIEC International Workshop on Spintronics　2012/05/31
First-principles calculations of electronic and magnetic properties of multiferroic oxides Co-doped BiFeO₃ International-presentation

Yuichiro Matsuzawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

9th RIEC International Workshop on Spintronics　2012/05/31
First-principles calculations of magneto-crystalline anisotropy in Co₂FeAl/MgO junctions International-presentation

Daiki Mori, Masahito Tsujikawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

IEEE International Magnetics Conference 2012　2012/05/07
First-principles study of magnetic anisotropy of MgO/FeCo interfaces and its electric-field effect International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai

IEEE International Magnetics Conference 2012　2012/05/07
Relation between perpendicular magnetic anisotropy and lattice constant in L1₀ ordered FeNi thin films International-presentation

Masaki Mizuguchi, Takayuki Kojima, Sho Ozaki, Yoshio Miura, Masafumi Shirai, Koki Takanashi

IEEE International Magnetics Conference 2012　2012/05/07
Role of spin-flip scattering at interfaces of MgO-based magnetic tunnel junctions with Heusler alloys International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

5th International Workshop on Spin Currents　2011/07/25
Non-collinear magnetic structures at Heusler alloy/MgO interfaces: A possible origin for the temperature dependence of tunneling magnetoresistance International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

JSPS York-Tohoku Research Symposium on Magnetic Materials and Spintronics　2011/06/27
Spin-dependent transport properties of magnetoresistive devices with half-metallic Heusler alloys International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

JST-DFG Workshop on Heusler Alloys and Their Spintronics Applications　2011/01/26
A first-principles study on spin-flip scattering at interfaces of magnetic tunnel junctions with half-metal International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Conference of the Asian Union of Magnetics Society 2010　2010/12/05
Electric field effects on magnetic anisotropy in MgO/Pt/Fe/Pt (001): A density-functional study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai, Tatsuki Oda

55th Annual Conference on Magnetism and Magnetic Materials　2010/11/14
A first-principles study on interfacial spin-flip scattering in magnetic tunnel junctions with half-metals International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

55th Annual Conference on Magnetism and Magnetic Materials　2010/11/14
Structural and magnetic properties at Co₂MnSi/MgO(001) interfaces studied by x-ray magnetic circular dichroism and first-principles calculations International-presentation

Yoshio Miura, Masafumi Shirai, Tohiaki Saito, Toshikazu Katayama, Takayuki Ishikawa, Masafumi Yamamoto, Daisuke Asakura, Tsuneharu Koide

55th Annual Conference on Magnetism and Magnetic Materials　2010/11/14
Effect of interfacial non-collinear magnetic structures on spin-mixing conductance in magnetic tunnel junctions with half-metals International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Ψ_k Conference 2010　2010/09/12
Electric field effects on magnetic anisotropy of ferromagnetic/dielectric film International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai, Tatsuki Oda

Ψ_k Conference 2010　2010/09/12
A first-principles study on tunneling magneto-resistance of Fe/MgAl₂O₄/Fe (001) magnetic tunnel junctions International-presentation

Shingo Muramoto, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Symposium on Advanced Magnetic Materials and Applications 2010　2010/07/12
147.Magnetic anisotropy of L1₀-ordered alloy FeNi: A first-principles study International-presentation

Yasushi Kuwahara, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Symposium on Advanced Magnetic Materials and Applications 2010　2010/07/12
145.The effect of non-collinear magnetic structures at the interfaces in Co2MnSi/MgO/Co2MnSi tunnel junctions International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Symposium on Advanced Magnetic Materials and Applications 2010　2010/07/12
A first-principles calculation of interface resistance in Co₂MnSi/X (001) junctions (X = Au, Ag, Al, Cr, V) International-presentation

Koichi Futatsukawa, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Symposium on Advanced Magnetic Materials and Applications 2010　2010/07/12
Electric-field effect on magnetic anisotropy in the thin films: A first-principles study International-presentation

Masahito Tsujikawa, Shinya Haraguchi, Tatsuki Oda, Yoshio Miura, Masafumi Shirai

International Symposium on Advanced Magnetic Materials and Applications 2010　2010/07/12
Hard x-ray photoelectron spectroscopy study on role of electronic structure in the martensitic phase transition of Ni₂Mn_1+xSn_1-x International-presentation

Mao Ye, Akio Kimura, Yoshio Miura, Masafumi Shirai, Yitao Cui, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Shigenori Ueda, Keisuke Kobayashi, Ryosuke Kainuma, Toetsu Shishido, Koji Fukushima, Takeshi Kanomata

37th International Conference on Vacuum Ultraviolet and X-ray Physics　2010/07/11
Computational design of half-metallic ferromagnets: The status quo and outlook International-presentation

Masafumi Shirai

International Conference on Core Research and Engineering Science of Advanced Materials　2010/05/30
A first-principles study on electronic structures of Fe₃O₄/GaAs interfaces International-presentation

Kazuma Izumiya, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

6th RIEC International Workshop on Spintronics　2010/02/05
Electronic and transport properties of magnetic tunnel junctions with half-metallic Co₂YZ (Y = Mn or Cr; Z = Si, Al or Ga) International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

6th RIEC International Workshop on Spintronics　2010/02/05
Electric field effects on magnetic anisotropy of MgO/Pt/Fe/Pt (001) International-presentation

Masahito Tsujikawa, Tatsuki Oda, Yoshio Miura, Masafumi Shirai

6th RIEC International Workshop on Spintronics　2010/02/05
An ab initio study on the tunneling magnetoresistance in FePt/Fe_n/MgO/Fe_n/FePt (n = 0‒4) magnetic tunnel junctions International-presentation

Mitsuru Suzuki, Kazutaka Abe, Yoshio Miura, Masafumi Shirai

6th RIEC International Workshop on Spintronics　2010/02/05
Electric field effects on magnetic anisotropy for a MgO/Pt/Fe/Pt (001) film: A first-principles study International-presentation

Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai, Tatsuki Oda

International Conference on Magnetism 2009　2009/07/26
Half-metallic behavior of Co₂MnSi/Co₂MnAl/MgO interface and its coherent tunneling conductance: An ab initio study International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Conference on Magnetism 2009　2009/07/26
A first-principles study on the tunneling magnetoresistance of Fe-inserted FePt/MgO/FePt magnetic tunnel junctions International-presentation

Yoshio Miura, Mitsuru Suzuki, Kazutaka Abe, Masafumi Shirai

20th International Colloquium on Magnetic Films and Surfaces　2009/07/20
The effect of interfacial Fe layers inserted into FePt/MgO/FePt (001) magnetic tunnel junctions: International-presentation

Mitsuru Suzuki, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

IEEE International Magnetics Conference 2009　2009/05/04
Computational design of half-metallic ferromagnets International-presentation

Masafumi Shirai

York University-Tohoku University Joint Seminar　2009/01/19
Theoretical design of highly spin-polarized interfaces between a half-metallic Heusler alloys and semiconductors International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Abe

MRS Fall Meeting 2008, Symposium L: New Materials with High Spin Polarization and Their Applications　2008/12/01
Half-metallic ferromagnets: The status quo and outlook International-presentation

Masafumi Shirai

Hitachi Spintronics Workshop　2008/11/19
High spin polarization at Heusler-alloy/silicon interface International-presentation

Kazutaka Abe, Yoshio Miura, Yasunori Shiozawa, Masafumi Shirai

53rd Annual Conference on Magnetism and Magnetic Materials　2008/11/10
Half-metallic behavior of Co<sub>2<\\sub>MnSi/Co<sub>2<\\sub>CrAl/MgO junction and its coherent tunneling conductance: A first-principles study International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

53rd Annual Conference on Magnetism and Magnetic Materials　2008/11/10
Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states International-presentation

Shigemi Mizukami, Daisuke Watanabe, Mikihiko Oogane, Yasuo Ando, Yoshio Miura, Masafumi Shirai, Terunobu Miyazaki

53rd Annual Conference on Magnetism and Magnetic Materials　2008/11/10
Theoretical design of highly spin-polarized interfaces between half-metals and non-magnetic materials International-presentation

Masafumi Shirai

23rd Nishinomiya-Yukawa Memorial International Workshop on Spin Transport in Condensed Matter　2008/10/27
Computational design of highly spin-polarized ferromagnet/semiconductor interfaces International-presentation

Masafumi Shirai

CNSI-RIEC Workshop on Nanoelectronics, Spintronics and Photonics　2008/10/09
Theoretical studies on magnetic tunnel junctions using perpendicular magnetic FePt electrodes International-presentation

Mitsuru Suzuki, Yujiro Taniguchi, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

CNSI-RIEC Workshop on Nanoelectronics, Spintronics and Photonics　2008/10/09
Highly spin-polarized interfaces between a half-metallic Heusler alloy and silicon International-presentation

Kazutaka Abe, Yoshio Miura, Yasunori Shiozawa, Masafumi Shirai

21st Congress and General Assembly of the International Union of Crystallography　2008/08/23
Computational design of magnetoresistive tunnel junctions with perpendicular magnetic anisotropy International-presentation

Masafumi Shirai, Yujiro Taniguchi, Yoshio Miura, Kazutaka Abe

International Conference on Quantum Simulators and Design 2008　2008/05/31
Effect of the interface oxidation on tunneling conductance of Co2YZ/MgO/Co2YZ sandwiches International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

International Conference on Quantum Simulators and Design 2008　2008/05/31
Half-metallic interface between a Heusler alloy and Si International-presentation

Kazutaka Abe, Yoshio Miura, Yasunori Shiozawa, Masafumi Shirai

International Conference on Quantum Simulators and Design 2008　2008/05/31
Theoretical studies on spin-dependent conductance in FePt/MgO/FePt(001) magnetic tunnel junctions International-presentation

Yujiro Taniguchi, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

IEEE International Magnetics Conference 2008　2008/05/04
Ab initio study on interface oxidation of Co2MnSi/MgO/Co2MnSi magnetic tunnel junction International-presentation

Yoshio Miura, Kazutaka Abe, Masafumi Shirai

52nd Annual Conference on Magnetism and Magnetic Materials　2007/11/05
A first-principles study on electronic and transport properties of FePt/MgO/FePt(001) magnetic tunnel junctions International-presentation

Yujiro Taniguchi, Yoshihiro Oba, Yoshio Miura, Kazutaka Abe, Msafaumi Shirai

IEEE 6th International Symposium on Metallic Multilayers　2007/10/15
The effect of defects and impurities in diluted magnetic semiconductors International-presentation

Polish-Japanese Joint Seminar on Ferromagnetism and Magnetic Nanostructures in Semiconductors　2007/09/27
116.Half-metallic Heusler alloys for magnetic tunnel junctions of MRAM: A first-principles study International-presentation

Masafumi Shirai

Materials Today Asia Symposium on the Functional Materials for Nonvolatile Memories　2007/09/03
115.A first-principles study on transport properties in magnetic tunnel junctions of Co-based full-Heusler alloys with MgO barrier International-presentation

Yoshio Miura, Yoshihiro Oba, Kazutaka Abe, Masafumi Shirai

International Symposium on Frontiers in Computational Science of Nanoscale Transport　2007/06/07
114.A theoretical study on MgO-based magnetic tunnel junctions with half-metallic Heusler-alloy electrodes International-presentation

Masafumi Shirai, Yoshio Miura, Yoshihiro Oba, Hirohisa Uchida, Kazutaka Abe

1st International Symposium on Advanced Magnetic Materials and Applications　2007/05/28
Theoretical study on coherent tunneling in half-metallic Heusler alloys/MgO junctions International-presentation

Masafumi Shirai

2nd RIEC International Workshop on Spintronics "MgO-based Magnetic Tunnel Junctions"　2007/02/15
Ab initio study on tunneling conductance in magnetic tunnel junctions of half-metallic full-Heusler alloys with MgO barrier International-presentation

Yosiho Miura, Yoshihiro Oba, Kazutaka Nagao, Masafumi Shirai

10th Joint Magnetism and Magnetic Materials/International Magnetics Conference　2007/01/07
Spin polarization and transport properties of Co2CrAl/GaAs heterostructure International-presentation

Kazutaka Nagao, Yoshio Miura, Masafumi Shirai

International Conference on Quantum Simulators and Design　2006/12/03
105.Ab initio study on spin dependent transport in Co2MnSi/MgO/Co2MnSi tunnel junction International-presentation

Yoshio Miura, Hirohisa Uchida, Masafumi Shirai, Kazutaka Nagao

International Conference on Magnetism 2006　2006/08/20
The effect of on-site Coulomb interaction in Cr-based diluted magnetic semiconductors International-presentation

Msafumi Shirai, Takeshi Makino, Yoshio Miura, Kazutaka Nagao

4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors　2006/08/15
102.First-principles study on spin-dependent transport in magnetic tunnel junctions of Heusler alloys with MgO barrier International-presentation

Yoshio Miura, Hirohisa Uchida, Kazutaka Nagao, Masafumi Shirai

19th International Colloquium on Magnetic Films and Surfaces　2006/08/15
101.The influence of nitrogen vacancy on magnetic properties of (Ga,Cr)N International-presentation

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

15th International Conference on Ternary and Multinary Compounds　2006/03/06
Ab initio study on stabilities of half-metallic Co-based full-Heusler alloys International-presentation

Yoshio Miura, Kazutaka Nagao, Masafumi Shirai

50th Annual Conference on Magnetism and Magnetic Materials　2005/10/30
Defects in the spintronic materials International-presentation

Masafumi Shirai

2nd International Symposium on Point Defect and Nonstoichiometry　2005/10/04
The effect of Coulomb interaction on half-metallic Heusler alloys International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

Psi_k Conference 2005 "Towards atomistic materials design"　2005/09/17
93.Ab initio studies on defect formation during growth of group-IV diluted magnetic semiconductors International-presentation

Yoshio Miura, Kazutaka Nagao, Masafumi Shirai

3rd International School and Conference on Spintronics and Quantum Information Technology　2005/08/01
First-principles study on defects in GaCrN International-presentation

Wide Band Gap Ferromangetic Semiconductors Workshop　2005/05/15
91.Ab-initio study on Mn impurities configuration in group-IV based diluted magnetic semiconductors International-presentation

Yoshio Miura, Masafumi Shirai, Kazutaka Nagao

12th International Workshop on Computational Physics and Materials Science: Total Energy and Force Methods　2005/01/13
90.First-principles calculation of electronic structure at half-metallic ferromagnet/semiconductor interfaces International-presentation

Masafumi Shirai

IFCAM Forum on Electronic Properties of Interfaces and Contacts　2004/11/28
First-principles study on magnetic and structural properties of orthorhombic CrAs International-presentation

Masafumi Shirai, Takeshi Makino, Yoshio Miura, Kazutaka Nagao

49th Annual Conference on Magnetism and Mangetic Materials　2004/11/07
Theoretical study on magnetic interactions in (Ga,Cr,Mn)As International-presentation

Takeshi Makino, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

31st International Symposium on Compound Semiconductors　2004/09/12
Theoretical study on magneto-optical properties of zinc-blende CrAs/GaAs multilayers International-presentation

Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

3rd International Conference on Physics and Applications of Spin-Related Phenomena in Semiconductors　2004/07/21
Computational design of zinc-blende half-metals and their nanostructures International-presentation

International Conference on Nanospintronics Design and Realization　2004/05/24
Ab initio calculations of zinc-blende CrAs/GaAs superlattices International-presentation

Kazutaka Nagao, Masafumi Shirai, Yoshio Miura

9th Joint Mangetism and Mgnetic Materials/International Magnetics Conference　2004/01/05
Theoretical design of novel half-metallic ferromagnets International-presentation

International Workshop on Nano-Scale Magnetoelectronics　2003/11/25
First-principles electronic structure calculation of zinc-blende CrAs/GaAs superlattices International-presentation

2nd International Conference on Semiconduntor Spintronics and Quantum Information Technology　2003/08/04
Theoretical study on anti-site defects in half-metallic zinc-blende ferromagnets International-presentation

Masafumi Shirai, Masayuki Seike, Kazunori Sato, Hiroshi Katayama-Yoshida

International Conference on Magnetism 2003　2003/07/27
Materials design and the synthesis of half-metallic ferromagnets International-presentation

Masafumi Shirai

International Symposium of Synthetic Nano-Functional Materials Project 2003　2003/02/24
Materials design of new half-metallic ferromagnets: zinc-blende CrAs and CrSb International-presentation

Masafumi Shirai

International Symposium on Scientific and Industrial Nanotechnology 2002　2002/12/12
Properties and electronic structures of magnetic nanostructures formed by strain-controlled molecular beam eptiaxy International-presentation

Masaharu Oshima, Kanta Ono, Masaki Mizuguchi, Jun Okabayashi, Atsushi Fujimori, Masafumi Shirai, Hiro Akinaga

International Symposium on Innovative Materials Processing by Controlling Chemical Reaction Field　2002/11/27
Possible half-metallic ferromagnetism in zinc blende CrSb and CrAs International-presentation

47th Annual Conference on Magnetism and Magnetic Materials　2002/11/11
X-ray absorption spectroscopy of zb-CrAs thin films International-presentation

Masaki Mizuguchi, Hiro Akinaga, Takashi Manago, Kanta Ono, Jun Okabayashi, Masaharu Oshima, Masafumi Shirai, M. Yuri, H. J. Lin, C. T. Chen

2nd International Conference on Physics and Application of Spin Related Phenomena in Semiconductors　2002/07/23
Materials design of Cr-based half-metallic ferromagnets International-presentation

Masafumi Shirai, Kazutomo Ikeuchi, Hideki Taguchi, Hiro Akinaga

2nd International Conference on Physics and Application of Spin Related Phenomena in Semiconductors　2002/07/23
Material design and synthesis of new zinc-blende half-metallic ferromagnets International-presentation

Hiro Akinaga, Masaki Mizuguchi, Hiroki Oki, Takashi Manago, Hironori Ofuchi, Jun Okabayashi, Atsushi Fujimori, Kanta Ono, Masaharu Oshima, Masafumi Shirai

Moscow International Symposium on Magnetism　2002/06/20

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Industrial Property Rights 4

強磁性トンネル接合体とそれを用いた磁気抵抗効果素子及びスピントロニクスデバイス

介川裕章, 三谷誠司, 新関智彦, 大久保忠勝, 猪俣浩一郎, 宝野和博, 白井正文, 三浦良雄, 阿部和多加, 村本慎伍

特許第5988019号

Property Type: Patent
トンネル磁気抵抗素子、不揮発性磁気メモリ、発光素子および３端子素子

大野英男, 池田正二, 李永珉, 川﨑雅司, 大友明, 白井正文

特許第4834834号

Property Type: Patent
III-V族強磁性半導体とその製造方法

大野英男, 白井正文, 松倉文礼, 千葉大地

特許第3817204号

Property Type: Patent
スピンエレクトロニクス材料およびその作成方法

秋永広幸, 白井正文, 眞砂卓史

特許第3537086号

Property Type: Patent

Research Projects 28

貴金属フリーL1₀型規則合金の第一原理理論設計 Competitive

System: The Other Research Programs

2011/12 - Present
磁性体／誘電体ハイブリッド不揮発性メモリの理論設計 Competitive

System: Grant-in-Aid for Scientific Research

2010/04 - Present
Investigation of orbital symmetry effect in spin-orbit torque and development for energy-efficient and high-density spin memory devices

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2024/04 - 2029/03
Renaissance of Metallic Superlattices

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2018/06/11 - 2023/03/31
Fabrication of Antiferromagnetically-coupled metallic superlattices for highly efficient spin orbit torque

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2018/04/01 - 2019/03/31
New development of ordered-alloy materials for spintronics

TAKANASHI Koki, MIZUGUCHI Masaki, SAKURABA Yuya, SEKI Takeshi, KUBOTA Takahide

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2013/05/31 - 2018/03/31

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The purpose of this research project was the development of ordered alloys for high performance and multi-functional spintronics devices and their application to spincaloritronics. We successfully improved the giant magnetoresistance (GMR) effect for the device with L21-ordered Co2(FeMn)Si full-Heusler alloy, and observed room temperature GMR using C1b-ordered NiMnSb half-Heusler alloy. We also achieved high magnetic anisotropy and low magnetic damping simultaneously for L11-type-stacked CoNi. In addition, we revealed the material dependence of anomalous Nernst effect, leading to the guiding principle for high spincaloritronic functionality.
Development of ferromagnetic tunnel junctions with a ferroelectric barrier layer and the control of their spin-transport by electric field effects

TSUNODA Masakiyo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2014/04/01 - 2017/03/31

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This study is aimed to control the spin-transport in Fe4N-based ferromagnetic tunnel junctions through the electric field effect by spontaneous polarization of a ferroelectric tunnel barrier. Various kinds of anti-perovskite-type transition-metal nitride thin films were successfully synthesized and their magnetic and magneto-transport properties were examined. The spin-polarized transport theory was newly constructed taking into account the spin-orbit interaction and crystal field effects, and successfully evaluated the spin-polarization of conduction electrons in ferromagnets with its sign through the anisotropic magnetoresistance effects. Epitaxial growth technique of thin films was developed for complex oxides as perovskite-type ferroelectrics. Electric field effects of ferromagnetic tunnel junctions with a ferroelectric barrier layer were investigated by the first-principles calculation.
Fabrication of multi-functional ferromagnetic ordered alloys by monoatomic layer deposition

TAKANASHI Koki, SHIRAI Masafumi, SAKURABA Yuya, MIZUGUCHI Masaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2010 - 2012

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Ordered alloys show various excellent magnetic properties, and they are promising as materials for next-generation electronics. From a viewpoint of application to magnetic storage technology, it is expected to develop new ordered alloys with multi-functionalities. In this study, we have attempted to fabricate novel ordered alloys with a high magnetic anisotropy, a high spin-polarization, and a low magnetic damping constant by employing a monoatomic layer deposition method. A stacked structure with L1_0-type FePt, CoPt and Co_2MnSi and an L1_0-type FeNi thin films were successfully fabricated, and various properties of the materials were investigated.
Theoretical design of efficient source of spin current Competitive

System: Grant-in-Aid for Scientific Research

2007/10 - 2011/03
Fabrication of spin source materials

TAKANASHI Koki, SHIRAI Masafumi, YAMAMOTO Masafumi, KURODA Shinji, TAKAHASHI Yukiko, FUJIMORI Atsushi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2007 - 2010

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This study aimed to investigate and fabricate spin source materials for the creation of spin current. Six research fields, "Theoretical design of efficient sources of spin current", "High-efficiency spin sources with a half-metallic ferromagnet", "Control of magnetic properties of ferromagnetic semiconductors and application to spin-polarized electron source", "Fabrication of highly efficient spin source materials by nanostructure control", "Structural analysis and spin polarization measurements of highly spin polarized materials", and "Characterization of highly spin-polarized materials using soft x-ray magnetic circular dichroism and soft x-ray scattering" were established, and collaborative researches were performed.
Design of spin-functional materials and development of analysis procedure of spin-polarized current Competitive

System: Grant-in-Aid for Scientific Research

2005/10 - 2009/03
Theoretical study on spin structure and dynamics in nano-scale magnetic materials Competitive

SHIRAI Masafumi, SAKUMA Akimasa, YAMAGAMI Hiroshi, NAKAMURA Kohji, ODA Tatsuki, ONO Kanta

Offer Organization: Japan Society for the Promotion of Science

System: Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2004/04 - 2007/03

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In order to contribute to the realization of new functional devices exploiting quantum nature of electrons, the theoretical basis for analyzing physical properties of nanometer-scale magnetic materials and devices has been constructed as follows : 1.The relation between atomic structures and spin-dependent transport phenomena has been clarified for epitaxial tunneling junctions and for metallic nanowires containing magnetic impurities. (M.Shirai, Y.Miura, K.Nagao) 2.The first-principles computational code for analyzing non-collinear spin structure has been improved so as to account the disorder in atomic and spin configurations within the coherent potential approximation. The electronic and magnetic structures in Mn-based disordered alloys have been investigated by using the computational code. (A.Sakuma) 3.The computational procedure which can account spiral magnetic structures correctly has been formulated on the basis of full-relativistic Dirac equations. (H.Yamagami) 4.The magnetic structure at ferromagnet/antiferromagnet interfaces has been analyzed theoretically in order to understand exchange-bias phenomena. The magnetic domain wall with a width of about 0.8 nm is found to be favorable energetically for Fe (110) monolayer. (K.Nakamura) 5.The first-principles molecular dynamics code which can account non-collinear magnetism has been developed. The formation of antiferromagnetically coupled oxygen molecule dimer (O_4 unit) has been found by the spin-dynamics simulation for liquid oxygen. (T.Oda) 6.The magnetic vortex states in nanometer-scale magnets have been observed by using the photoelectron emission microscopy. The relation between the shape of the magnet and the vortex states has been analyzed by using micro-magnetic simulation. The experimental procedure has been developed for observing the dynamics of magnetic vortex by means of photoelectron emission microscopy. (K.Ono)
Theoretical design of spintronic devices Competitive

System: Grant-in-Aid for Scientific Research

2002/10 - 2006/03
Fabrication of electronic and spin-related functional materials Competitive

System: New Program for the Promotion of Basic Reseach by Public Corporation

2001/04 - 2006/03
Semiconductor Nanospintronics

MUNEKATA Hiroo, TANAKA Masaaki, ITOH Kohei, KATSUMOTO Shingo, SHIRAI Masafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tokyo Institute of Technology

2002 - 2006
Device design based on transition-metal compounds Competitive

System: SCF Encouragement of Basic Research

2002/04 - 2005/03
Design of opto-spintronics devices and nanospin-probes

SHIRAI Masafumi, MIURA Yoshio, NAGAO Kazutaka, KATAYAMA Hiroshi, SATO Kazunori

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2002 - 2005

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1. Diluted magnetic semiconductors (DMS) based on wide band-gap materials such as GaN and ZnO, which are exploited in optoelectronic device applications, have been designed theoretically on the basis of first-principles calculations. (1) The relative energy position and the degree of hybridization between the valence-band of host semiconductors and 3d orbitals of magnetic dopants are important to understand the mechanism of ferromagnetism in DMS. (2) The Curie temperature of DMS has been evaluated accurately by accounting the exchange interaction between localized spins in DMS as a function of the inter-atomic distance. Room-temperature ferromagnetism is hardly achieved for wide band-gap DMS since the exchange interaction is rather short-ranged. (3) The inhomogeneous distribution of magnetic dopants is expected in DMS due to attractive interaction between them. (4) The increase of Curie temperature is expected for DMS co-doped with non-magnetic elements appropriately. (5) The ferromagnetism could be obtained by doping non-magnetic elements appropriately into certain semiconductors. 2. Half-metallic ferromagnets exhibiting high spin polarization have been designed theoretically on the basis of first-principles calculations. (1) Zinc-blende CrAs and CrSb are promising materials for spintronic device applications since they are compatible with semiconductors exploited in conventional electronic devices. (2) The influence of atomic disorder in half-metallic Heusler alloys has been examined theoretically. High spin polarization is maintained even in the B2-type disordered structure. (3) The electronic structure of hetero-junctions between half-metallic ferromagnets and semiconductors has been investigated. High spin polarization is preserved for the (110) interface between Heusler alloys And AArnientichirtnrAAC wAll As fnr 7inn-h17onda Or Ac/carninnndiinfnr inforfanne
スピントロニクスデバイス・デザインに関する研究連絡調整

白井正文, 今村裕志, 江藤幹雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特定領域研究

Institution: 東北大学

2002 - 2005

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光スピントロニクス材料として期待されるワイドバンドギャップ磁性半導体において、磁性不純物の空間分布や格子欠陥が強磁性転移温度に及ぼす影響を第一原理計算に基づいて検証した。磁性不純物間には引力的な相互作用がはたらくため、希薄磁性半導体においては互いに磁気的に結合していない高不純物濃度クラスタが形成され、強磁性転移温度は低くなる。また、窒化ガリウムにドープされた磁性スピン間の強磁性相互作用は窒素空孔が存在すると弱められるので、高い強磁性転移温度を得るためには、窒素空孔の生成を抑制する必要がある。(白井) 光子-電子スピン量子メディア変換を量子力学的モデルで記述し、一光子の偏光状態から電子のスピン状態へ量子情報が転写される過程のダイナミクスを解析した。詳細な解析の結果、高い転写確率を得るためには、光子-量子ドット結合強度と量子ドットからのホールのトンネルレートの両方を入射光子のスペクトル幅よりも大きくとり、かつ、マッチング条件を満たす必要があることを明らかにした。(今村) 半導体微細加工で作製される微小なくびれ構造や量子ポイントコンタクトを利用した新しいスピン注入のアイディアを提案した。スピン軌道相互作用が存在する場合の量子ポイントコンタクトの輸送特性を数値計算によって調べ、電気伝導度の量子化が見られること、透過した電子は電流に垂直な方向にスピン分極すること、InGaAsヘテロ構造において50%以上のスピン分極が得られることを示した。他に、量子ドットにおける電子格子相互作用による位相緩和の解明、2重量子ドット系でのスピン結合の評価および量子演算のシミュレーションを行った。(江藤)
半導体ナノスピントロニクス

宗片比呂夫, 勝本信吾, 伊藤公平, 田中雅明, 大野英男, 白井正文

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 東京工業大学

2002 - 2002

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従来の半導体物性に「スピン」という新しい自由度をもたらす様々な材料や構造が作製されるようになり、スピン機能を利用したデバイス実現へ向けた多くの基礎研究が行われるなど、これまで半導体ではあまり意識されなかったスピンを積極的に利用しようという研究が、ここ数年急速に進展している。本企画調査は、「半導体ナノスピントロニクス」分野およびその関連分野の研究者を集め、半導体や磁性体と半導体の複合構造中のスピンが関与する物性・機能およびその応用に関する研究成果について、集中的に討議することにより「半導体ナノスピントロニクス」の基本的な理解を深め,新しいスピン制御デバイスヘの応用の可能性を拓くことを目的として行われた。具体的には、平成14年12月19,20日に仙台国際センターにおいて「半導体中のスピン現象とその応用」に関する総合的な研究会(Physics and Application of Spin-related Phenomena in Semiconductors ; PASPS-8)を開催し、磁性原子を添加した半導体のバルク結晶や薄膜、磁性体と半導体から成る複合構造、非磁性半導体の量子構造、それらを微細加工した「スピントロニクスナノ構造」を対象に、(1)材料・構造の作製に関する材料科学、(2)キャリアスピン、磁性原子のスピン、光の間の相互作用に起因した光・電子物性,(3)キャリアあるいは磁性原子のスピンと伝導電子との相互作用に起因した電気伝導物性、(4)非磁性半導体中に注入・励起されたキャリアスピンのスピン緩和・スピンコヒーレンスなどのスピン物性、(5)以上述べた種々のスピン依存現象の応用可能性、に関して理論、実験、デバイス応用など様々な面からの研究課題を、口頭発表・ポスター発表形式で議論し、「半導体ナノスピントロニクス」と呼ばれる新分野の基盤技術を固めるとともに、21世紀の新しいエレクトロニクスに向けた我が国における研究コミュニティーを形成することができた。
First-principles design of quantum superstructures for development of spin-electronics

SHIRAI Masafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

2000 - 2002

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Injection of spin-polarized carriers into semiconductors is a basic technology for manifestation of spin-electronic devices which exploit both electronic charge and spin degrees of freedom. In order to improve the efficiency of spin-injection into semiconductors, completely spin-polarized (half-metallic) ferromagnets and their quantum superstructures with semiconductors, which are expected to be promising candidates for the source of spin-injection, have been designed theoretically by using first-principles electronic structure calculations. The results obtained by this project are as follows: (1) New half-metallic ferromagnets, zinc-blende CrAs, CrSb, and CrP, are designed theoretically. (2) The spin-polarization in these materials in almost unaffected by the spin-orbit interaction. (3) Antisite defects, Cr impurities at As-sites, reduce the spin-polarization in zinc-blende CrAs. (4) Zinc-blende CrAs/GaAs (001) multilayer structures maintain the half-metallic behavior. (5) An inhomogeneous doping method in suggested to realize Si-based ferromagnetic semiconductors.
High resoeution, high energy spectroscopy of electronic states on phase transitions

SUGA Shigemasa, SHIRAI Masafumi, SUZUKI Naoshi, IMADA Shin

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Osaka University

1996 - 1999

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Changes of electronic states near the Fermi level on phase transitions are extensivelu studied by means of high resolution spectroscopy. The resonance photoemission technique was intensively employed. In the former half of the research, the spectral changes of the low carrier heavy fermion system YbィイD24ィエD2AsィイD23ィエD2 and related compounds were studied. The high reslution photoemission was successfully performed in the Kondo insulator system YbBィイD212ィエD2. In the case of the NdィイD21-xィエD2SrィイD2xィエD2MnOィイD23ィエD2, spectral changes through paramagnetic insulator-ferromagnetic metal-charge ordered insulator were observed for x=0.5. For x=0.47, paramagnetic insulator-ferromagnetic metal transition was observed and the Fermi cut off was observed down to the lowest temperature. In the latter half of the research, we constructed and commissioned the world-best performance soft X-ray beam line at SPring-8. The photoemission performed at 900eV for Yb system has shown that the surface YbィイD12+ィエD1 is almost suppressed. Thus the deconvolution which has been always required to derive the bulk YbィイD12+ィエD1 components from the spectra measured near 100eV is no more necessary to know the genuine bulk electronic states. The situation was more severe for the Ce system, where the deconvolution was useless because of the overlap of surface and bulk components. However, our bulk sensitive photoemision technique is found to provide the bulk spectrum. Thus we have found that the Ce 4f spectra can be scaled by the Kondo temperature. This unprecedented results are published in Nature and stimulating many scientists in the world. In parallel, the structure and magnetism were theoretically studied for taransition metal nitrides and YCoB systems. The lattice constants in the nonmagnetic phase, total energy, as well as magnetic moments were calculated.
Thoretical Study on First-principles Calculation of Lattice Dynamics and Pressure-Induced Superconductivity

SUZUKI Naoshi, SHIRAI Masafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Osaka University

1994 - 1996

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Electronic band strucutures, electron-lattice interaction, lattice dynamics and superconductivity in high pressure FCC phase of solid iodine and bromine are studied in detail on the basis of the first-principles full-potential LAPW (FLAPW) method and the semi-empirical tight-binding method. The main results are summarized as follows. 1.The obtained band structures have three hole Fermi surfaces, and hence the FCC solid iodine and bromine are typical hole metals. The density of states at the Fermi energy N (E_F) decreases with increasing pressure. 2.Electron-lattice coupling has been evaluated microscopically by the tight binding method in which transfer energies and their derivatives are determined so as to reproduce the first-principles band structures obatined by the FLAPW method. The Fermi surface average of squared electron-lattice coupling <xi^2> increases considerably as the pressure increases. 3.The frequencies of the longitudinal (L) and the transverse (T) phonon modes at the X (0,0,2pi/a) point in the Brillouin zone (BZ) have been calculated by the frozen-phonon method. The obtained frequencies show hardening with increasing pressure. 4.The phonon spectrum of the whole BZ have been calculated by taking accout of the electron-lattice interaction and by considering only the nearest neighboring short range forces which were determined to reproduce omega_L and omega_T at the X point obtained by the frozen-phonon method. The average of phonon frequency <omega> and that of squared phonon frequency <omega^2> increases significantly as the pressure increases. 5.The value of N (E_F) <xi^2> increases considerably with increasing pressure, but <omega^2> increases more rapidly than N (E_F) <xi^2> as pressure increases. Therefore the dimensionless electron-phonon coupling lambda = N (E_F) <xi^2> /M <omega^2> becomes a decreasing function of pressure. As the results the superconducting transition temperature T_c also decreases with increasing pressure. The magnitude of T_c is in order of 1 K,which agrees with the experimental results. But, the calculated pressure-dependence of T_c is diffrent from that of observations in iodine. This discrepancy may suggest a necessity of treating the electron-lattice interaction in more first-principles manner.
磁性有機分子結晶の電子状態、スピンのゆらぎおよび磁性に関する研究

鈴木直, 望月和子, 白井正文

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 大阪大学

1994 - 1994

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1.拡張されたハバ-ドモデルに基づく磁気相図 (1)1個の軌道をもつ異なる分子が単位胞に2個含まれる、および(2)2個の軌道をもつ分子が単位胞に1個含まれる、2つの場合について金属強磁性発現の条件を調べた: (1)fillingが1/4の場合、異なる分子の軌道エネルギーに差がありかつ1次元性が強いとにはフェリ磁性相が現れ得る. (2)fillingが1/4の場合、同じ種類の軌道間の飛び移りより異なる軌道間の飛び移りが大きいときには強磁性相が現れ得る. 2.H_2NO結晶の非磁性電子帯構造の第1原理的計算 (1)H_2NOが同じ向きに並んだ1次元鎖および(2)H_2NOが交互に逆向きに並んだ1次元鎖が正方格子を形成する2つの仮想結晶に対してフルポテンシャルLAPW法によるバンド計算を行い以下の結果を得た: (1)NとOの反結合軌道が1次元性の強いバンドを形成し、フェルミレベルはこのバンドの中央、谷のところに位置する。従って、磁性が現れる場合には反強磁性である. (2)(1)に比較して1次元性が弱まりかつバンドの縮退が増加したためにフェルミレベルでの状態密度がかなり大きくなり、この場合には強磁性状態が現れ得る可能性がある. 3.H_2NO結晶の強磁性電子帯構造の第1原理的計算 2の(2)の場合について、強磁性状態における電子帯構造の計算を行い、全エネルギーと磁気モーメントを求めた.その結果、強磁性状態が確かにセルフコンシステントな解として求まり、分子1個当たり、約0.8から0.9μ_Bの磁気モーメントをもつことが明らかとなった.結晶が仮想的でありかつ分子間距離もあまり現実的でないところでの計算ではあるが、純粋な有機分子系でも金属強磁性状態が可能であり得ることを示した点で非常に有意義な結果である.
磁性有機分子結晶の電子状態、スピンのゆらぎおよび磁性に関する研究

鈴木直, 望月和子, 白井正文

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 大阪大学

1993 - 1993

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1.反強磁性体MOTMPの磁気異方性と磁場誘起相転移分子反強磁性体MOTMPにおける磁気双極子相互作用エネルギーをエバルト法で評価し、実験で観測されているように確かにα-軸がスピン容易軸であることを示した。また、得られた双極子エネルギーを用いて計算した各軸方向の磁化飽和磁場およびα-軸に磁場をかけた場合のスピンフロップ磁場は実験結果と定量的に良い対応を示す。 2.拡張されたハバードモデルに基づく磁気相図 (1)1個の軌道をもつ異なる分子が単位胞に2個含まれる、および(2)2個の軌道をもつ分子が単位胞に1個含まれる、2つの場合について金属強磁性発現の条件を調べた: (1)fillingが1/4の場合、異なる分子の軌道エネルギーに差がありかつ1次元性が強いときにはフェリ磁性相が現れ得る. (2)fillingが1/4の場合、同じ種類の軌道間の飛び移りより異なる軌道間の飛び移りが大きいときには強磁性相が現れ得る. 3.H_2NO結晶の電子帯構造の第1原理的計算 (1)H_2NOが同じ向きに並んだ1次元鎖および(2)H_2NOが交互に逆向きに並んだ1次元鎖が正方格子を形成する2つの仮想結晶に対してフルポテンシャルLAPW法によるバンド計算を行い以下の結果を得た: (1)NとOの反結合軌道が1次元性の強いバンドを形成し、フェルミレベルはこのバンドの中央、谷のところに位置する。従って、磁性が現れる場合には反強磁性である. (2)(1)に比較して1次元性が弱まりかつバンドの縮退が増加したためにフェルミレベルでの状態密度がかなり大きくなり、この場合には強磁性状態が現れ得る可能性がある.
Theoretical Study on Electronic Band Structureand Physical Properties if Ternary Compounds

SUZUKI Naoshi, MOTIZUKI Kazuo, SHIRAI Masafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for General Scientific Research (C)

Institution: Osaka University

1992 - 1993

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Electronic vand strucurures and total energies are calculated for intercalated compounds A_xTiS_2 (A = transition-metals, silver, and alkaline metals) and trnary intermetallic compounds Mn_2Sb, Mn_3GaC, and Fe_7Se_8 by using the LAPW method. 1. A_xTiS_2 (A = transition-metals, silver, and alkaline metals) For the silver-intercalated compound Ag_x TiS_2 the selectronic states of silver atoms hybridize strongly with those of the host material, but a cohesive energy gain due to the hybrideization is rather small. On the other hand, the alkaline metal atoms only donate electrons to the host material. The chemical bonds between guest atoms and the host material are relatively weak for Ag_xTiS_2 and the alkline-metal-intercalated compounds compared with the transition-metal-intercalated compounds. From the total energy calculation it is confirmed that the ABC-stacking structure is more stable than the AB-stacking is favorable for Ag_xTiS_2. 2. Ternary intermetallic compounds Mn_2Sb, Mn_3GaC, and Fe_7Se_8 (1) Mn_2Sb : From the total energies calculated as a function of the lattice constants, a and c, it is found that the ferrimagnetic state is more stable than the antiferromagnetic state. The evaluated value of the linear compressibility along the a-axis is larger than that along the c-axis. (2) Mn_3GaC : It is found that both the magnitude of the magnetic moment at each maganese site and its volume dependence are larger for the antiferromagnetic state than those for the ferromagnetic state. Further, the antiferromagnetic phase becomes more stable than the ferromagneric state in larger volume side. (39 Fe_7Se_8 : In the ferrimagnetic state, the magnetic moments at crystallographically inequivalent iron sites have almost the same values with each other. The photoemission and the optical conductivity spectra clculated from the electronic density of states are in good correspondence with the observations.
磁性有機分子結晶の電子状態、スピンのゆらぎおよび磁性に関する研究

鈴木直, 白井正文, 望月和子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 大阪大学

1992 - 1992

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今年度行なった研究テーマそれぞれで得られた重要な結果ならびに知見を以下に示す。 1.Cu_2Sb型金属間化合物の磁気相図遍歴電子磁性体Cu_2Sb型化合物の多様な磁気構造を決定している要因を明らかにする目的で、拡張ハバードハミルトニアンに基づき、電子の飛び移りエネルギーと電子相関エネルギーを表すパラメーター空間での磁気相図を決定した。主な結果は、(a)電子数nが小さい領域ではフェリ磁性が、nが大きい領域では強磁性が現れやすい、(b)nが中間の領域では強磁性が現れやすい、(c)なぜフェリ磁性が現れるかあるいはどの型の反強磁性が現れるかはフェルミ面の形やフェルミ面近傍の結合様式に依存する、である。原子軌道の代りに分子軌道を用いた議論を行えば、さらに重要な知見が得られると期待される。 2.LAPW法によるH_2NO仮想結晶の電子帯構造マッフイン・ティンポンシャル近似を用いた計算では、予想されたことではあるがこの物質では共有結合性が強く、H_2NO分子の電子状態を反映したバンド構造を得ることはできなかった。次にフルポテンシャルを用いた計算を行なった結果、ある程度H_2NO分子の電子状態を反映したバンド構造を得ることに成功した。今回行なった計算は、H_2NO分子の性格を失わない範囲で密に分子を配列さをた構造における常磁性状態に対するものであるが、現実的な配列での磁性状態に対する計算も可能である見とおしがついたと言える。 3.磁気双極子相互作用に起因する磁気異方性エネルギーエバルトの方法で任意の結晶系でかつ任意のスピン配列に対して磁気双極子相互作用エネルギーを計算できるプログラムをほぼ完成させたので、今後、局在スピン分子磁性体の磁化容易軸の決定あるいはスピンフロップ転移の議論が容易に行なえると思われる。
Theory of Electronic Structure and Magnetic Phase Diagram of Intermetallic Compounds

MOTIZUKI Kazuko, SHIRAI Masafumi, SUZUKI Naoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for General Scientific Research (C)

Institution: Osaka University

1990 - 1991

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To clarify the nature of the d-electrons, either localized or itinerant, various transition-metal compounds, and to explain the observed magnetic properties, it is useful to know the electronic band structure for each compound. Previously we have made systematic band calculations for NiAs-type compounds, 1T-type and 2H-type layered compounds and their intercalation compounds, and Mn_3MC-type compounds with M=Zn, Ga, Sn. The nature of bonding in these compounds were elucidated by calculating the bond orders. Furthermore, anomalous magnetic properties observed in NiAs-type compounds, such as MnAs, CoAs, and FeAs, have been explained on the basis of spin fluctuation theory developed by Moriya, by taking account of characteristic behavior of the density of states obtained for each compound. During recent two years, we have calculated electronic bands of cubicperovskite-type compounds, Mn_4N and Mn_4C, Cu_2Sb-type compounds, , Mn_2As, Mn_2Sb, Cr_2As, Fe_2As, Cu_2Sb, MnAlGe, MnGaGe, MnZnGe, and Cu_3Au type compounds FePt_3, FePd_3, for non-magnetic and magnetic(ferro or antiferro)states. Self-consistent APW and LAPW methods are used. The magnetic moments calculated for all compounds are in good agreement with observed values. Furthermore, the overall feature of the calculated density of states of Mn_2Sb, MnAlGe and Cr_2As shows good correspondence with the spectrum observed by photoemission and inverse photoemission measurement.
酸化物超伝導体の電子格子相互作用と光物性

白井正文

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 大阪大学

1990 - 1990

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文部科学省第2回ナノテクノロジーサマースクール「量子効果素子の物理」

2006/08/13 - 2006/08/27

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講師講義題目「スピントロニクスの理論」
文部科学省第1回ナノテクノロジーサマースクール「量子効果素子の物理」

2005/08/11 - 2005/08/23

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講師講義題目「スピンエレクトロニクスの理論」