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Makoto Koda

Section

Graduate School of Engineering

Job title

Professor

Degree

博士（工学）（東北大学）

researchmap

https://researchmap.jp/7000003437

J-GLOBAL ID

201201030770607850

Research History 5

2022/04 - Present

Tohoku University　Graduate School of Engineering Department of Materials Science　Professor
2022/03 - Present

National Institutes for Quantum and Radiological Science and Technology
2020/04 - 2023/03

Tohoku University
2010/10 - 2022/03

School of Engineering, Tohoku university　Associate Professor
2005/10 - 2010/09

School of Engineering, Tohoku university　Research Associate

Education 1

Tohoku University　Graduate School, Division of Engineering　Electrical Engineering

- 2005/09/14

Committee Memberships 9

AIP Applied Physics Letters　Editorial Advisory Board

2024/09 - Present
Applied Physics Express　編集委員

2017/04 - Present
応用物理学会スピントロニクス研究会　庶務幹事

2021/01 - 2022/12
日本金属学会広報推進WG　委員

2020/04 - 2022/03
応用物理学会スピントロニクス研究会　10.4半導体・有機・光・量子スピントロニクスプログラム委員

2015/04 - 2018/03
応用物理学会スピントロニクス研究会　庶務幹事

2013/04 - 2015/03
応用物理学会スピントロニクス研究会　庶務幹事

2013/04 - 2015/03
応用物理学会スピントロニクス研究会　企画幹事

2011/04 - 2013/03
応用物理学会スピントロニクス研究会　企画幹事

2011/04 - 2013/03

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Professional Memberships 4

日本磁気学会
日本物理学会
日本金属学会
応用物理学会

Research Interests 4

電子スピン波
Solid state physics
Low temperature physics
Spin orbit interaction

Research Areas 3

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /
Nanotechnology/Materials / Applied physics - general / Semiconductor Spintronics
Natural sciences / Semiconductors, optical and atomic physics / 半導体量子物性

Awards 16

日本学術振興会賞

2023/12　日本学術振興会
APEX/JJAP編集貢献賞

2021/02
青葉工学振興会賞

2020/12　一般財団法人青葉工学振興会　半導体における新規スピン制御原理の確立と長距離スピン輸送に関する研究
第 78 回金属学会功績賞

2020/03　日本金属学会　半導体量子構造のスピン軌道相互作用が生み出すスピン物性開拓と金属スピントロニクスへの展開
第8 回RIEC Award 東北大学研究者賞

2018/10　東北大学電気通信研究所　半導体量子構造における電気的スピン生成とスピン緩和抑制に関する研究
第17回インテリジェント・コスモス奨励賞

2018/04　インテリジェントコスモス財団　半導体量子構造における電気的スピン生成と長距離スピン輸送に関する研究
若手科学者賞

2018/04　文部科学省　スピン軌道相互作用を用いたスピン生成とスピン輸送の研究
工学研究科長特別教育賞

2018/03　東北大学大学院工学研究科　多様な学生を獲得するための戦略的高校訪問の実践
第14回金属学会村上奨励賞

2017/09　日本金属学会　半導体におけるスピン生成・スピン制御に関する研究
第35回本多記念会本多記念研究奨励賞

2014/06/01　本多記念会　スピン軌道相互作用を用いた電気的スピン生成・スピン制御に関する研究
第50回本多記念会原田研究奨励賞

2010/07/15　本多記念　電気的スピン制御及び電気的スピン注入に関する研究
第20回トーキン科学技術振興財団研究奨励賞

2010/03/15　トーキン科学技術振興財団　電気的スピン注入・スピン制御に関する研究
第12回青葉工学振興会研究奨励賞

2006/12/08　財団法人青葉工学振興会
東北大学電気・情報系優秀賞

2006/03　東北大学
応用物理学会講演奨励賞

2002/03　応用物理学会　(Ga,Mn)As/n+-GaAsトンネル接合を用いた電気的なスピン偏極電子注入
電子情報通信学会東北支部学生員奨励賞

2001/03/20　電子情報通信学会

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Papers 149

Single-layer graphene oxide film grown on α-Al₂O₃(0001) for use as an adsorbent Peer-reviewed

Shiro Entani, Mitsunori Honda, Masaru Takizawa, Makoto Kohda

Beilstein Journal of Nanotechnology　16　1082-1087　2025/07/10
Publisher: Beilstein Institut
DOI： 10.3762/bjnano.16.79 　

eISSN： 2190-4286

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Graphene oxide (GO) is expected to be one of the most promising adsorbents for metal ions, including radioactive nuclides in aqueous solutions. Large-area and single-layer graphene oxide (SLGO) grown on α-Al₂O₃(0001) was used as a model structure of GO since the aggregation and re-stacking of the GO sheets prevent the adequate analysis of the adsorption state. The SLGO film was obtained by oxidizing monolayer graphene grown by metal-free chemical vapor deposition on the α-Al₂O₃(0001) surface, and the adsorption state was determined by surface analytical techniques. It was clarified that Cs adsorbs on oxygen functional groups by substituting with H atoms from carboxyl and hydroxy groups. It is also estimated that the weight adsorption capacity of SLGO in the 1.0 mol/L-Cs aqueous solution is as much as approximately 70 wt %. It has been demonstrated that GO has great potential to be a promising adsorbent for Cs in aqueous solutions.
Selective Synthesis of Large-Area Monolayer Tin Sulfide from Simple Substances. International-journal

Kazuki Koyama, Jun Ishihara, Nozomi Matsui, Atsuhiko Mori, Sicheng Li, Jinfeng Yang, Shiro Entani, Takeshi Odagawa, Makito Aoyama, Chaoliang Zhang, Ye Fan, Ibuki Kitakami, Sota Yamamoto, Toshihiro Omori, Yasuo Cho, Stephan Hofmann, Makoto Kohda

Nano letters　2025/05/20

DOI： 10.1021/acs.nanolett.5c01639 　

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Both tin monosulfide (SnS) and tin disulfide (SnS2) are thermodynamically stable layered materials with the potential for spin-valleytronic devices and photodetectors. Notably, SnS, owing to its low symmetry, exhibits interesting properties such as ferroelectricity, shift-current, and a persistent spin helix state in the monolayer limit. Unlike SnS2, however, creating large-area atomic-thickness crystals of SnS is challenging, owing to the enhanced interlayer interactions caused by lone pair electrons. Here, we demonstrate that p-type SnS can be selectively grown by varying the sulfur vapor concentration relative to tin using high-purity elemental precursors in a chemical vapor deposition setup. Based on that, we further show that monolayer SnS crystals, up to several tens of micrometers in lateral scale, can be obtained by controlled sublimation of bulk SnS crystals. These findings pave the way for device applications based on high-quality tin sulfide.
Effect of photoexcited carrier density on spin diffusion coefficient and helical spin lifetime

Ryo Tokimitsu, Takachika Mori, Jun Ishihara, Makoto Kohda, Yuzo Ohno, Kensuke Miyajima

Physical Review Research　2025/04/21

DOI： 10.1103/PhysRevResearch.7.023072 　
Direct imprinting of arbitrary spin helices using programmable structured light in a semiconductor two-dimensional electron gas

Keito Kikuchi, Jun Ishihara, Miari Hiyama, Sota Yamamoto, Yuzo Ohno, Takachika Mori, Kensuke Miyajima, Makoto Kohda

Physical Review Applied　2025/04/07

DOI： 10.1103/PhysRevApplied.23.044017 　
Synchronized Photoluminescence and Electrical Mobility Enhancement in 2D WS2 through Sequence-Specific Chemical Passivation. International-journal Peer-reviewed

Zhaojun Li, Henry Nameirakpam, Elin Berggren, Ulrich Noumbe, Takashi Kimura, Eito Asakura, Victor Gray, Deepa Thakur, Tomas Edvinsson, Andreas Lindblad, Makoto Kohda, Rafael B Araujo, Akshay Rao, M Venkata Kamalakar

Journal of the American Chemical Society　146　(51)　35146-35154　2024/12

DOI： 10.1021/jacs.4c11052 　

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Two-dimensional (2D) semiconducting dichalcogenides hold exceptional promise for next-generation electronic and photonic devices. Despite this potential, the pervasive presence of defects in 2D dichalcogenides results in carrier mobility and photoluminescence (PL) that fall significantly short of theoretical predictions. Although defect passivation offers a potential solution, its effects have been inconsistent. This arises from the lack of chemical understanding of the surface chemistry of the 2D material. In this work, we uncover new binding chemistry using a sequence-specific chemical passivation (SSCP) protocol based on 2-furanmethanothiol (FSH) and bis(trifluoromethane) sulfonimide lithium salt (Li-TFSI), which demonstrates a synchronized 100-fold enhancement in both carrier mobility and PL in WS2 monolayers. We propose an atomic-level synergistic defect passivation mechanism of both neutral and charged sulfur vacancies (SVs), supported by ultrafast transient absorption spectroscopy (TA), Hard X-ray photoelectron spectroscopy (HAXPES), and density functional theory (DFT) calculations. Our results establish a new semiconductor quality benchmark for 2D WS2, paving the way for the development of sustainable 2D semiconductor technologies.
Two-color Kerr rotation spectroscopy of a suspended transition-metal dichalcogenide monolayer Peer-reviewed

G. Mariani, Y. Kunihashi, L. Smet, T. Wakamura, S. Sasaki, J. Ishihara, M. Kohda, J. Nitta, H. Sanada

Applied Physics Letters　125　252401-1-252401-6　2024/12

DOI： 10.1063/5.0240071 　
Polarization-dependent photoluminescence of Ce-implanted MgO and MgAl₂O₄ Peer-reviewed

Manato Kawahara, Yuichiro Abe, Koki Takano, F. Joseph Heremans, Jun Ishihara, Sean E. Sullvan, Christian Vorwerk, Vrindaa Somjit, Christopher P. Anderson, Gary Wolfowicz, Makoto KOHDA, Shunuske Fukami, Giulia Galli, David D. Awschalom, Hideo Ohno, Shun Kanai

Applied Physics Express　17　(7)　072004-1-072004-4　2024/06
Publisher: IOP Publishing
DOI： 10.35848/1882-0786/ad59f4 　

ISSN： 1882-0778

eISSN： 1882-0786

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Abstract Since the qubit’s performance of solid-state spin centers depends highly on the host material, spin centers using new host materials may offer new qubit applications. We investigate the optical properties of Ce-implanted MgO and MgAl2O4 as potential materials holding the optically accessible qubit. We find that the photoluminescence of Ce-implanted MgAl2O4 is more than 10 times brighter than that of Ce-implanted MgO and observe polarization-dependent emission of Ce center in MgAl2O4 with 2% at 4 K under 500 mT, suggesting that the properties required for initializing and reading the state of the spin qubit have been achieved.
Enhanced interlayer electron transfer by surface treatments in mixed-dimensional van der Waals semiconductor heterostructures

Takeshi Odagawa, Sota Yamamoto, Chaoliang Zhang, Kazuki Koyama, Jun Ishihara, Giacomo Mariani, Yoji Kunihashi, Haruki Sanada, Junsaku Nitta, Makoto Kohda

APL Materials　2024/06/01

DOI： 10.1063/5.0214718 　
Perspective on spin-based wave-parallel computing

Makoto Kohda, Takeshi Seki, Yasushi Yuminaka, Tetsuya Uemura, Keito Kikuchi, Gian Salis

Applied Physics Letters　123　(19)　2023/11/06
Publisher: AIP Publishing
DOI： 10.1063/5.0168083 　

ISSN： 0003-6951

eISSN： 1077-3118

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Waves exhibit unique characteristics, such as diffraction and interference, which distinguishes them from the particle nature of electrons currently used for binary and sequential data processing and storage. In the solid state, wave properties can be found in electron spin waves in semiconductors or magnons in magnetic materials. These are useful for communication, processing and storage, and allow multiplexing of the information. Given this perspective, after introducing the information theory of wave-parallel computing and arguing the fundamental properties necessary for implementation with wave-based information carriers, we specifically examine how electron spin waves and magnons can be used as information carriers for processing and storage. Then, after explaining the fundamental physics of the electron spin wave based on the persistent spin helix state, we assess the potential of magnon-assisted magnetization switching for realizing the selective writing and reading of multiplexed information. Ferromagnet/semiconductor hybrid structures are emphasized as a platform for generating and controlling both electron spin waves and magnons. Interconversion among light helicity, electron spin waves and magnons is also discussed. Finally, we show several challenges and provide an outlook on the key steps that must be demonstrated for implementing spin-based wave-parallel computing.
Deterministic Current‐Induced Perpendicular Switching in Epitaxial Co/Pt Layers without an External Field

Jeongchun Ryu, Can Onur Avci, Moojune Song, Mantao Huang, Ryan Thompson, Jiseok Yang, San Ko, Shutaro Karube, Nobuki Tezuka, Makoto Kohda, Kab‐Jin Kim, Geoffrey S. D. Beach, Junsaku Nitta

Advanced Functional Materials　2023/07/02
Publisher: Wiley
DOI： 10.1002/adfm.202209693 　

ISSN： 1616-301X

eISSN： 1616-3028
Bismuth induced enhancement of Rashba spin–orbit interaction in GaAsBi/GaAs heterostructures Peer-reviewed

Yoji Kunihashi, Yasushi Shinohara, Sho Hasegawa, Hiroyuki Nishinaka, Masahiro Yoshimoto, Katsuya Oguri, Hideki Gotoh, Makoto Kohda, Junsaku Nitta, Haruki Sanada

Applied Physics Letters　122　(18)　2023/05/01

DOI： 10.1063/5.0145496 　

ISSN： 0003-6951
Characterization of the out-of-plane Dresselhaus effective magnetic field in InGaAs/InAlAs (110) multiple quantum wells at room temperature

Shota Sato, Kyohei Sugaya, Koichi Nakanishi, Nobuhide Yokota, Makoto Kohda, Ken Morita

Japanese Journal of Applied Physics　62　(4)　2023/04

DOI： 10.35848/1347-4065/acbff6 　

ISSN： 0021-4922

eISSN： 1347-4065
Imprinting Spatial Helicity Structure of Vector Vortex Beam on Spin Texture in Semiconductors International-journal Peer-reviewed

Jun Ishihara, Takachika Mori, Takuya Suzuki, Sota Sato, Ken Morita, Makoto Kohda, Yuzo Ohno, Kensuke Miyajima

Physical Review Letters　130　(12)　126701-126701　2023/03/24

DOI： 10.1103/PhysRevLett.130.126701 　

ISSN： 0031-9007

eISSN： 1079-7114
Lifetime of spin-orbit induced spin textures in a semiconductor heterostructure probed by quantum corrections to conductivity

Takahito Saito, Toshimichi Nishimura, Ju Young Yoon, Jonas Kölzer, Daisuke Iizasa, Michael Kammermeier, Thomas Schäpers, Junsaku Nitta, Makoto Kohda

Physical Review Research　4　(4)　2022/10

DOI： 10.1103/PhysRevResearch.4.043217 　

ISSN： 2643-1564
Development of an optically gated Fe/n-GaAs spin-polarized transistor

J. Y. Kim, M. Samiepour, E. Jackson, J. Ryu, D. Iizasa, T. Saito, M. Kohda, J. Nitta, H. E. Beere, D. A. Ritchie, A. Hirohata

Physical Review B　106　(13)　2022/10/01

DOI： 10.1103/PhysRevB.106.134404 　

ISSN： 2469-9950

eISSN： 2469-9969
Selective damping modulation in a synthetic antiferromagnet induced by spin-orbit torque

Shutaro Karube, Takumi Hoshika, Chaoliang Zhang, Makoto KOHDA, Junsaku NITTA

Applied Physics Express　15　(10)　2022/09/26
Publisher: IOP Publishing
DOI： 10.35848/1882-0786/ac9512 　

ISSN： 1882-0778

eISSN： 1882-0786
Observation of Spin-Splitter Torque in Collinear Antiferromagnetic RuO2 International-journal

Shutaro Karube, Takahiro Tanaka, Daichi Sugawara, Naohiro Kadoguchi, Makoto Kohda, Junsaku Nitta

Physical Review Letters　129　(13)　137201-137201　2022/09/19
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevlett.129.137201 　

ISSN： 0031-9007

eISSN： 1079-7114
Efficient spin–orbit torque in magnetic trilayers using all three polarizations of a spin current

Jeongchun Ryu, Ryan Thompson, Jae Yeol Park, Seok Jong Kim, Gaeun Choi, Jaimin Kang, Han Beom Jeong, Makoto Kohda, Jong Min Yuk, Junsaku Nitta, Kyung Jin Lee, Byong Guk Park

Nature Electronics　5　(6)　217-223　2022/04

DOI： 10.1038/s41928-022-00735-9 　

eISSN： 2520-1131
D'yakonov-Perel and Elliot-Yafet spin relaxation rates in InGaAs/InAlAs multiple quantum wells at room temperature

Ayuki Arikawa, Yasuhito Saito, Koichi Nakanishi, Shota Sato, Kyohei Sugaya, Nobuhide Yokota, Makoto Kohda, Ken Morita

Applied Physics Express　15　(4)　2022/04

DOI： 10.35848/1882-0786/ac5a16 　

ISSN： 1882-0778

eISSN： 1882-0786
Anisotropic spin dynamics in semiconductor narrow wires from the interplay between spin-orbit interaction and planar magnetic field

Junpei Sonehara, Michael Kammermeier, Dai Sato, Daisuke Iizasa, Ulrich Zülicke, Shutaro Karube, Junsaku Nitta, Makoto Kohda

Physical Review B　105　(9)　2022/03/25
Publisher: American Physical Society ({APS})
DOI： 10.1103/PhysRevB.105.094434 　

ISSN： 2469-9950

eISSN： 2469-9969
Thickness dependence of spin–orbit torques in Pt/Co structures on epitaxial substrates

Gaeun Choi, Jeongchun Ryu, Ryan Thompson, Jong-Guk Choi, Jimin Jeong, Sungjun Lee, Min-Gu Kang, Makoto Kohda, Junsaku Nitta, Byong-Guk Park

APL Materials　10　(1)　011105-011105　2022/01/01
Publisher: AIP Publishing
DOI： 10.1063/5.0077074 　

eISSN： 2166-532X
Reliable modeling of weak antilocalization for accurate spin-lifetime extraction

Michael Kammermeier, Takahito Saito, Daisuke Iizasa, Ulrich Zülicke, Makoto Kohda

Physical Review B　104　(23)　2021/12/15

DOI： 10.1103/PhysRevB.104.235430 　

ISSN： 2469-9950

eISSN： 2469-9969
Intravalley Scattering Probed by Excitation Energy Dependence of Valley Polarization in Monolayer MoS2

Eito Asakura, Takeshi Odagawa, Masaki Suzuki, Shutaro Karube, Junsaku Nitta, Makoto Kohda

Journal of Physics D: Applied Physics　54　(48)　485304-485304　2021/07/20
Publisher: IOP Publishing
DOI： 10.1088/1361-6463/ac1626 　

ISSN： 0022-3727

eISSN： 1361-6463
Room-temperature spin–orbit magnetic fields in slightly misoriented (110) InGaAs/InAlAs multiple quantum wells

Koichi Nakanishi, Ayuki Arikawa, Yasuhito Saito, Daisuke Iizasa, Satoshi Iba, Yuzo Ohno, Nobuhide Yokota, Makoto Kohda, Yoshihiro Ishitani, Ken Morita

Applied Physics Letters　119　(3)　032405-032405　2021/07/19

DOI： 10.1063/5.0055876 　

ISSN： 0003-6951

eISSN： 1077-3118
Distinguishing persistent effects in an undoped GaAs/AlGaAs quantum well by top-gate-dependent illumination Peer-reviewed

Takafumi Fujita, Ryota Hayashi, Makoto Kohda, Julian Ritzmann, Arne Ludwig, Junsaku Nitta, Andreas D. Wieck, Akira Oiwa

Journal of Applied Physics　129　(23)　234301-234301　2021/06/21
Publisher: AIP Publishing
DOI： 10.1063/5.0047558 　

ISSN： 0021-8979

eISSN： 1089-7550
Full spin-orbit coefficient in III-V semiconductor wires based on the anisotropy of weak localization under in-plane magnetic field

Toshimichi Nishimura, Kohei Yoshizumi, Takahito Saito, Daisuke Iizasa, Junsaku Nitta, Makoto Kohda

Physical Review B　103　(9)　2021/03/08
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.103.094412 　

ISSN： 2469-9950

eISSN： 2469-9969
Publisher’s Note: “Origin of spin–orbit torque in single-layer CoFeB investigated via in-plane harmonic Hall measurements” [AIP Advances 11, 025033 (2021)]

Ye Du, Ryan Thompson, Makoto Kohda, Junsaku Nitta

AIP Advances　11　(3)　039903-039903　2021/03/01
Publisher: {AIP} Publishing
DOI： 10.1063/5.0048384 　
Effect of electronic temperature on spin dynamics for drifting spins

Kunihashi Yoji, Aragaki Shuntaro, Tanaka Yusuke, Sanada Haruki, Tawara Takehiko, Oguri Katsuya, Onomitsu Koji, Kohda Makoto, Nitta Junsaku, Gotoh Hideki

JSAP Annual Meetings Extended Abstracts　2021.1　1776-1776　2021/02/26
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2021.1.0_1776 　

eISSN： 2436-7613
Origin of spin–orbit torque in single-layer CoFeB investigated via in-plane harmonic Hall measurements

Ye Du, Ryan Thompson, Makoto Kohda, Junsaku Nitta

AIP Advances　11　(2)　025033-025033　2021/02/01
Publisher: AIP Publishing
DOI： 10.1063/5.0035845 　

eISSN： 2158-3226
Anisotropic Spin-Orbit Torque through Crystal-Orientation Engineering in Epitaxial Pt

Ryan Thompson, Jeongchun Ryu, Gaeun Choi, Shutaro Karube, Makoto Kohda, Junsaku Nitta, Byong-Guk Park

Physical Review Applied　15　(1)　2021/01/28
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevapplied.15.014055 　

eISSN： 2331-7019
Control of spin relaxation anisotropy by spin-orbit-coupled diffusive spin motion

Daisuke Iizasa, Asuka Aoki, Takahito Saito, Junsaku Nitta, Gian Salis, Makoto Kohda

Physical Review B　103　(2)　2021/01/15
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.103.024427 　

ISSN： 2469-9950

eISSN： 2469-9969
Azimuthal angle dependence of terahertz emission intensity from epitaxial magnetic heterostructures

M. Nakajima, S. Tetsukawa, S. Liu, T. Matsunaga, V. K. Mag-Usara, V. C. Agulto, M. Kohda, R. Thompson, H. Gamou, Y. Du, S. Karube, J. Nitta, M. Asakawa, M. Tani

Optics InfoBase Conference Papers　2021
Voltage control of spin–orbit torque in Pd/Co/Pd/HfOx Peer-reviewed

Takamasa Hirai, Yuki Hibino, Kento Hasegawa, Makoto Kohda, Tomohiro Koyama, Daichi Chiba

Applied Physics Express　13　(12)　123005-123005　2020/12/01
Publisher: IOP Publishing
DOI： 10.35848/1882-0786/abcd71 　

ISSN： 1882-0778

eISSN： 1882-0786
Room-temperature perpendicular magnetic anisotropy of Pt/Co/AlOx trilayers on SrTiO3 (001) Peer-reviewed

Ye Du, Shoma Arai, Shingo Kaneta-Takada, Le Duc Anh, Shutaro Karube, Makoto Kohda, Shinobu Ohya, Junsaku Nitta

AIP Advances　10　(10)　105010-105010　2020/10/01
Publisher: AIP Publishing
DOI： 10.1063/5.0023282 　

eISSN： 2158-3226
Tunneling mechanism in a (Ga,Mn)As/GaAs-based spin Esaki diode investigated by bias-dependent shot noise measurements Peer-reviewed

T. Arakawa, J. Shiogai, M. Maeda, M. Ciorga, M. Utz, D. Schuh, Y. Niimi, M. Kohda, J. Nitta, D. Bougeard, D. Weiss, K. Kobayashi

Physical Review B　102　(4)　2020/07/15
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevB.102.045308 　

ISSN： 2469-9950

eISSN： 2469-9969
Enhanced longevity of the spin helix in low-symmetry quantum wells Peer-reviewed

Daisuke Iizasa, Makoto Kohda, Ulrich Zülicke, Junsaku Nitta, Michael Kammermeier

Physical Review B　101　(24)　2020/06/15
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevB.101.245417 　

ISSN： 2469-9950

eISSN： 2469-9969
arXiv:2006.08253.

Daisuke Iizasa, Asuka Aoki, Takahito Saito, Junsaku Nitta, Gian Salis, Makoto Kohda

arXiv preprint arXiv:2006.08253　2020/06
Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110) International-journal Peer-reviewed

Ryan Thompson, Jeongchun Ryu, Ye Du, Shutaro Karube, Makoto Kohda, Junsaku Nitta

Physical Review B　101　(21)　2020/06/01

DOI： 10.1103/PhysRevB.101.214415 　

ISSN： 2469-9950

eISSN： 2469-9969
Disentanglement of Spin-Orbit Torques in Pt/Co Bilayers with the Presence of Spin Hall Effect and Rashba-Edelstein Effect Peer-reviewed

Ye Du, Hiromu Gamou, Saburo Takahashi, Shutaro Karube, Makoto Kohda, Junsaku Nitta

Physical Review Applied　13　(5)　2020/05
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevApplied.13.054014 　

eISSN： 2331-7019
Spin-orbit parameters derivation using single-frequency analysis of InGaAs multiple quantum wells in transient spin dynamics regime Peer-reviewed

Hiroki Shida, Kohei Kawaguchi, Yasuhito Saito, Ichirota Takazawa, Toshiki Fukasawa, Daisuke Iizasa, Takahito Saito, Takahiro Kitada, Yoshihiro Ishitani, Makoto Kohda, Ken Morita

Journal of Applied Physics　127　(15)　2020/04

DOI： 10.1063/5.0002821 　

ISSN： 0021-8979

eISSN： 1089-7550
Spin dynamics of electrons accumulated in light induced potential dots

Sanada Haruki, Kunihashi Yoji, M. Stramma Alexander, Tanaka Yusuke, Gotoh Hideki, Onomitsu Koji, Tagarelli Fedele, Kohda Makoto, Nitta Junsaku, Tawara Takehiko, Sogawa Tetsuomi

JSAP Annual Meetings Extended Abstracts　2020.1　1966-1966　2020/02/28
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2020.1.0_1966 　

eISSN： 2436-7613
Magnetically-induced spin component in GaAsBi epilayer

Kunihashi Yoji, Tanaka Yusuke, Sanada Haruki, Tawara Takehiko, Kohda Makoto, Nitta Junsaku, Hasegawa Sho, Nishinaka Hiroyuki, Yoshimoto Masahiro, Gotoh Hideki

JSAP Annual Meetings Extended Abstracts　2020.1　1967-1967　2020/02/28
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2020.1.0_1967 　

eISSN： 2436-7613
Anomalous Spin-Orbit Field via the Rashba-Edelstein Effect at the W/Pt Interface Peer-reviewed

Shutaro Karube, Nobuki Tezuka, Makoto Kohda, Junsaku Nitta

Physical Review Applied　13　(2)　2020/02

DOI： 10.1103/PhysRevApplied.13.024009 　

eISSN： 2331-7019
Detection of Spin Transfer from Metal to Molecule by Magnetoresistance Measurement International-journal Peer-reviewed

Hiromu Gamou, Koki Shimose, Ryoto Enoki, Emi Minamitani, Akitoshi Shiotari, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Yoshiaki Sugimoto, Makoto Kohda, Junsaku Nitta, Shinji Miwa

Nano Letters　20　(1)　75-80　2020/01/08
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.nanolett.9b03110 　

ISSN： 1530-6984

eISSN： 1530-6992
Transient diffusive spin dynamics in intrinsic InGaAs/InAlAs multiple quantum wells Peer-reviewed

Kohei Kawaguchi, Toshik Fukasawa, Ichirota Takazawa, Hiroki Shida, Yasuhito Saito, Daisuke Iizasa, Takahito Saito, Takahiro Kitada, Yoshihiro Ishitani, Makoto Kohda, Ken Morita

Applied Physics Letters　115　(17)　2019/10/21

DOI： 10.1063/1.5124011 　

ISSN： 0003-6951
Temperature and laser energy dependence of the electron g-factor in intrinsic InGaAs/InAlAs multiple quantum wells Peer-reviewed

K. Morita, A. Okumura, H. Takaiwa, I. Takazawa, T. Oda, T. Kitada, M. Kohda, Y. Ishitani

Applied Physics Letters　115　(1)　2019/07/01

DOI： 10.1063/1.5100343 　

ISSN： 0003-6951
Simultaneous evaluation of drift- and diffusion-induced spin-orbit fields in a (001) GaAs/AlGaAs two-dimensional electron gas Peer-reviewed

Takahito Saito, Asuka Aoki, Junsaku Nitta, Makoto Kohda

APPLIED PHYSICS LETTERS　115　(5)　2019/07

DOI： 10.1063/1.5111605 　

ISSN： 0003-6951

eISSN： 1077-3118
Detection of both optical polarization and coherence transfers to excitonic valley states in CVD-grown monolayer MoS<inf>2</inf> Peer-reviewed

Asakura, E., Suzuki, M., Karube, S., Nitta, J., Nagashio, K., Kohda, M.

Applied Physics Express　12　(6)　2019/06

DOI： 10.7567/1882-0786/ab21a8 　

ISSN： 1882-0778
Evaluation of spin-orbit torque in a L1(0)-FePt single layer and a L1(0)-FePt/Pt bilayer Peer-reviewed

Takumi Sato, Takeshi Seki, Makoto Kohda, Jeongchun Ryu, Hiromu Gamou, Shutaro Karube, Koki Takanashi, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　58　(6)　2019/06

DOI： 10.7567/1347-4065/ab1e5a 　

ISSN： 0021-4922

eISSN： 1347-4065
Enhancement of spin current generation in epitaxial α -Ta/CoFeB bilayer Peer-reviewed

Hiromu Gamou, Ye Du, Makoto Kohda, Junsaku Nitta

Physical Review B　99　(18)　2019/05/09

DOI： 10.1103/physrevb.99.184408 　

ISSN： 2469-9950

eISSN： 2469-9969
Irradiation Effects on Induced Electron Conductivity in an un-doped GaAs/AlGaAs Quantum Well Hall Bar

T. Fujita, R. Hayashi, M. Kohda, J. Ritzmann, A. Ludwig, J. Nitta, A. D. Wieck, A. Oiwa

2019 Compound Semiconductor Week, CSW 2019 - Proceedings　2019/05/01
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/ICIPRM.2019.8819035 　
Crystal orientation dependence of spin-orbit torques in Co/Pt bilayers Peer-reviewed

Jeongchun Ryu, Can Onur Avci, Shutaro Karube, Makoto Kohda, Geoffrey S. D. Beach, Junsaku Nitta

APPLIED PHYSICS LETTERS　114　(14)　2019/04

DOI： 10.1063/1.5090610 　

ISSN： 0003-6951

eISSN： 1077-3118
Spin-momentum locked spin manipulation in a two-dimensional Rashba system. International-journal Peer-reviewed

Makoto Kohda, Takanori Okayasu, Junsaku Nitta

Scientific reports　9　(1)　1909-1909　2019/02/13

DOI： 10.1038/s41598-018-37967-9 　

More details Close

Spin-momentum locking, which constrains spin orientation perpendicular to electron momentum, is attracting considerable interest for exploring various spin functionalities in semiconductors and topological materials. Efficient spin generation and spin detection have been demonstrated using the induced helical spin texture. Nevertheless, spin manipulation by spin-momentum locking remains a missing piece because, once bias voltage is applied to induce the current flow, the spin orientation must be locked by the electron momentum direction, thereby rendering spin phase control difficult. Herein, we demonstrate the spin-momentum locking-induced spin manipulation for ballistic electrons in a strong Rashba two-dimensional system. Electron spin rotates in a circular orbital motion for ballistically moving electrons, although spin orientation is locked towards the spin-orbit field because of the helical spin texture. This fact demonstrates spin manipulation by control of the electron orbital motion and reveals potential effects of the orbital degree of freedom on the spin phase for future spintronic and topological devices and for the processing of quantum information.
Simultaneous extraction of Rashba and Dresselhaus spin-orbit coefficients in GaAs/AlGaAs (110) two-dimensional electron gas

Daisuke Iizasa, Shu Kitamura, Dai Sato, Satoshi Iba, Yuzo Ohno, Shutaro Karube, Junsaku Nitta, Makoto Kohda

2019 COMPOUND SEMICONDUCTOR WEEK (CSW)　2019
Phase velocity of drifting spin wave packets in semiconductor two-dimensional electron gas Peer-reviewed

Yusuke Tanaka, Yoji Kunihashi, Haruki Sanada, Hideki Gotoh, Koji Onomitsu, Makoto Kohda, Junsaku Nitta, Tetsuomi Sogawa

APPLIED PHYSICS EXPRESS　12　(1)　2019/01

DOI： 10.7567/1882-0786/aaf170 　

ISSN： 1882-0778

eISSN： 1882-0786
Temperature-dependent spin Hall effect tunneling spectroscopy in platinum Peer-reviewed

Keita Nakagawara, Shinya Kasai, Jeongchun Ryu, Seiji Mitani, Luqiao Liu, Makoto Kohda, Junsaku Nitta

Applied Physics Letters　115　(16)　2019

DOI： 10.1063/1.5121165 　

ISSN： 0003-6951
Robustness of a persistent spin helix against a cubic Dresselhaus field in (001) and (110) oriented two-dimensional electron gases Peer-reviewed

D. Iizasa, D. Sato, K. Morita, J. Nitta, M. Kohda

Physical Review B　98　(16)　165112-1-165112-9　2018/10/08
Publisher: American Physical Society (APS)
DOI： 10.1103/physrevb.98.165112 　

ISSN： 2469-9950

eISSN： 2469-9969
Evaluation of temperature-dependent spin Hall angle in CoFeB/MgO/Pt tunneling junctions by using Spin Hall effect tunneling spectroscopy

Nakagawara Keita, Kasai Shinya, Mitani Seiji, Karube Shutaro, Kohda Makoto, Nitta Junsaku

JSAP Annual Meetings Extended Abstracts　2018.1　2169-2169　2018/03/05
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2018.1.0_2169 　

eISSN： 2436-7613
Spatial variation of dynamic nuclear spin polarization probed by the non-local Hanle effect Peer-reviewed

J. Shiogai, M. Ciorga, M. Utz, D. Schuh, M. Kohda, D. Bougeard, T. Nojima, D. Weiss, J. Nitta

APPLIED PHYSICS LETTERS　112　(13)　132403-1-132403-4　2018/03

DOI： 10.1063/1.5020314 　

ISSN： 0003-6951

eISSN： 1077-3118
Enhancement of spin-orbit interaction of Cu thin films by oxidation treatment Peer-reviewed

Ryoto Enoki, Hiromu Gamou, Makoto Kohda, Junsaku Nitta

Applied Physics Express　11　(3)　2018/03/01

DOI： 10.7567/APEX.11.033001 　

ISSN： 1882-0786 1882-0778
Effect of optical waveguide on photoluminescence polarization in layered material GaSe with millimeter scale Peer-reviewed

Masaki Suzuki, Makoto Kohda, Shoichi Takasuna, Shunichiro Matsuzaka, Yohei Sato, Tadao Tanabe, Yutaka Oyama, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　57　(2)　2018/02

DOI： 10.7567/JJAP.57.020308 　

ISSN： 0021-4922

eISSN： 1347-4065
Electric-field-induced on/off switching of the Faraday effect Peer-reviewed

Yuki Hibino, Tomohiro Koyama, Satoshi Sumi, Hiroyuki Awano, Kazumoto Miwa, Shimpei Ono, Makoto Kohda, Daichi Chiba

APPLIED PHYSICS EXPRESS　10　(12)　2017/12

DOI： 10.7567/APEX.10.123201 　

ISSN： 1882-0778

eISSN： 1882-0786
Weak antilocalization induced by Rashba spin-orbit interaction in layered III-VI compound semiconductor GaSe thin films Peer-reviewed

Shoichi Takasuna, Junichi Shiogai, Shunichiro Matsuzaka, Makoto Kohda, Yutaka Oyama, Junsaku Nitta

PHYSICAL REVIEW B　96　(16)　161303　2017/10

DOI： 10.1103/PhysRevB.96.161303 　

ISSN： 2469-9950

eISSN： 2469-9969
Drift-Induced Enhancement of Cubic Dresselhaus Spin-Orbit Interaction in a Two-Dimensional Electron Gas International-journal Peer-reviewed

Yoji Kunihashi, Haruki Sanada, Yusuke Tanaka, Hideki Gotoh, Koji Onomitsu, Keita Nakagawara, Makoto Kohda, Junsaku Nitta, Tetsuomi Sogawa

PHYSICAL REVIEW LETTERS　119　(18)　187703-187703　2017/10

DOI： 10.1103/PhysRevLett.119.187703 　

ISSN： 0031-9007

eISSN： 1079-7114
Evaluation of spin Hall angle in CoFeB/MgO/Pt tunneling junctions by using Spin Hall effect tunneling spectroscopy at low temperature

Nakagawara Keita, Kasai Shinya, Mitani Seiji, Karube Shutaro, Kohda Makoto, Nitta Junsaku

JSAP Annual Meetings Extended Abstracts　2017.2　2080-2080　2017/08/25
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/jsapmeeting.2017.2.0_2080 　

eISSN： 2436-7613
Physics and application of persistent spin helix state in semiconductor heterostructures Invited Peer-reviewed

Makoto Kohda, Gian Salis

SEMICONDUCTOR SCIENCE AND TECHNOLOGY　32　(7)　073002-1-073002-24　2017/07

DOI： 10.1088/1361-6641/aa5dd6 　

ISSN： 0268-1242

eISSN： 1361-6641
Different spin relaxation mechanisms between epitaxial and polycrystalline Ta thin films Peer-reviewed

Hiromu Gamou, Jeongchun Ryu, Makoto Kohda, Junsaku Nitta

APPLIED PHYSICS EXPRESS　10　(2)　023003-1-023003-4　2017/02

DOI： 10.7567/APEX.10.023003 　

ISSN： 1882-0778

eISSN： 1882-0786
Control of magnetic anisotropy in Pt/Co system using ionic liquid gating Peer-reviewed

Takamasa Hirai, Tomohiro Koyama, Aya Obinata, Yuki Hibino, Kazumoto Miwa, Shimpei Ono, Makoto Kohda, Daichi Chiba

APPLIED PHYSICS EXPRESS　9　(6)　063007-063007　2016/06

DOI： 10.7567/APEX.9.063007 　

ISSN： 1882-0778

eISSN： 1882-0786
Observation of the D'yakonov-Perel' Spin Relaxation in Single-Crystalline Pt Thin Films International-journal Peer-reviewed

Jeongchun Ryu, Makoto Kohda, Junsaku Nitta

PHYSICAL REVIEW LETTERS　116　(25)　256802-256802　2016/06

DOI： 10.1103/PhysRevLett.116.256802 　

ISSN： 0031-9007

eISSN： 1079-7114
Current-Controlled Spin Precession of Quasistationary Electrons in a Cubic Spin-Orbit Field Peer-reviewed

P. Altmann, F. G. G. Hernandez, G. J. Ferreira, M. Kohda, C. Reichl, W. Wegscheider, G. Salis

PHYSICAL REVIEW LETTERS　116　(19)　196802-1-196802-4　2016/05

DOI： 10.1103/PhysRevLett.116.196802 　

ISSN： 0031-9007

eISSN： 1079-7114
Bias dependence of spin injection/transport properties of a perpendicularly magnetized FePt/MgO/GaAs structure Peer-reviewed

Rento Ohsugi, Yoji Kunihashi, Haruki Sanada, Makoto Kohda, Hideki Gotoh, Tetsuomi Sogawa, Junsaku Nitta

APPLIED PHYSICS EXPRESS　9　(4)　043002-1-043002-4　2016/04

DOI： 10.7567/APEX.9.043002 　

ISSN： 1882-0778

eISSN： 1882-0786
Gate-controlled switching between persistent and inverse persistent spin helix states Peer-reviewed

K. Yoshizumi, A. Sasaki, M. Kohda, J. Nitta

APPLIED PHYSICS LETTERS　108　(13)　132402-1-132402-4　2016/03

DOI： 10.1063/1.4944931 　

ISSN： 0003-6951

eISSN： 1077-3118
Drift transport of helical spin coherence with tailored spin-orbit interactions Peer-reviewed

Y. Kunihashi, H. Sanada, H. Gotoh, K. Onomitsu, M. Kohda, J. Nitta, T. Sogawa

NATURE COMMUNICATIONS　7　10722-10722　2016/03

DOI： 10.1038/ncomms10722 　

ISSN： 2041-1723
20pBQ-7 Electron spin generation and manipulation by using spin-orbit interaction in semiconductor heterostructures

Kohda Makoto

Meeting Abstracts of the Physical Society of Japan　71　2105-2105　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_2105 　

ISSN： 2189-079X
21pBC-13 Microscopic understanding of spin-dependent energy distribution of pure spin current

Maeda M., Arakawa T., Shiogai J., Ciorga M., Schuh D., Bougeard D., Weiss D., Kohda M., Nitta J., Ferrier M., Niimi Y., Kobayashi K.

Meeting Abstracts of the Physical Society of Japan　71　1268-1268　2016
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.71.1.0_1268 　

ISSN： 2189-079X
Enhancement of electric field modulation of coercivity in Pt /Co/Al-O structures by tuning Co surface oxidation Peer-reviewed

Junichi Shiogai, Tatsuro Ohashi, Tim Yang, Makoto Kohda, Takeshi Seki, Koki Takanashi, Junsaku Nitta

JOURNAL OF PHYSICS D-APPLIED PHYSICS　49　(3)　03LT01-03LT05　2016/01

DOI： 10.1088/0022-3727/49/3/03LT01 　

ISSN： 0022-3727

eISSN： 1361-6463
Transition of a two-dimensional spin mode to a helical state by lateral confinement Peer-reviewed

P. Altmann, M. Kohda, C. Reichl, W. Wegscheider, G. Salis

PHYSICAL REVIEW B　92　(23)　235304-1-235304-6　2015/12

DOI： 10.1103/PhysRevB.92.235304 　

ISSN： 1098-0121

eISSN： 1550-235X
Effect of cubic Dresselhaus spin-orbit interaction in a persistent spin helix state including phonon scattering in semiconductor quantum wells Peer-reviewed

R. Kurosawa, K. Morita, M. Kohda, Y. Ishitani

APPLIED PHYSICS LETTERS　107　(18)　182103-1-182103-5　2015/11

DOI： 10.1063/1.4935044 　

ISSN： 0003-6951

eISSN： 1077-3118
All-optical evaluation of spin-orbit interaction based on diffusive spin motion in a two-dimensional electron gas Peer-reviewed

M. Kohda, P. Altmann, D. Schuh, S. D. Ganichev, W. Wegscheider, G. Salis

APPLIED PHYSICS LETTERS　107　(17)　172402-1-172402-4　2015/10

DOI： 10.1063/1.4934671 　

ISSN： 0003-6951

eISSN： 1077-3118
In-plane tunneling anisotropic magnetoresistance in (Ga,Mn)As/GaAs Esaki diodes in the regime of the excess current Peer-reviewed

J. Shiogai, M. Ciorga, M. Utz, D. Schuh, M. Kohda, D. Bougeard, T. Nojima, D. Weiss, J. Nitta

APPLIED PHYSICS LETTERS　106　(26)　262402-1-262402-5　2015/06

DOI： 10.1063/1.4923309 　

ISSN： 0003-6951

eISSN： 1077-3118
Comparison of electrical and optical detection of spin injection in L1(0)-FePt/MgO/GaAs hybrid structures Peer-reviewed

R. Ohsugi, J. Shiogai, Y. Kunihashi, M. Kohda, H. Sanada, T. Seki, M. Mizuguchi, H. Gotoh, K. Takanashi, J. Nitta

JOURNAL OF PHYSICS D-APPLIED PHYSICS　48　(16)　164003-1-164003-6　2015/04

DOI： 10.1088/0022-3727/48/16/164003 　

ISSN： 0022-3727

eISSN： 1361-6463
Layer thickness dependence of spin orbit torques and fields in Pt/Co/AlO trilayer structures Peer-reviewed

Tim Yang, Minsik Kong, Makoto Kohda, Takeshi Seki, Koki Takanashi, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　54　(4)　04DM05-04DM05　2015/04

DOI： 10.7567/JJAP.54.04DM05 　

ISSN： 0021-4922

eISSN： 1347-4065
17aAE-9 Shot noise properties in (Ga,Mn)As/GaAs Esaki diode

Arakawa T., Shiogai J., Ciorga M., Schuh D., Kohda M., Nitta J., Bougeard D., Weiss D., Ono T., Kobayashi K.

Meeting Abstracts of the Physical Society of Japan　70　1040-1040　2015
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/jpsgaiyo.70.2.0_1040 　

ISSN： 2189-079X
Shot Noise Induced by Nonequilibrium Spin Accumulation International-journal Peer-reviewed

Tomonori Arakawa, Junichi Shiogai, Mariusz Ciorga, Martin Utz, Dieter Schuh, Makoto Kohda, Junsaku Nitta, Dominique Bougeard, Dieter Weiss, Teruo Ono, Kensuke Kobayashi

PHYSICAL REVIEW LETTERS　114　(1)　016601-1-016601-5　2015/01

DOI： 10.1103/PhysRevLett.114.016601 　

ISSN： 0031-9007

eISSN： 1079-7114
Platinum thickness dependence and annealing effect of the spin-Seebeck voltage in platinum/yttrium iron garnet structures Peer-reviewed

Yuta Saiga, Kotaro Mizunuma, Yasushi Kono, Jeong Chun Ryu, Hiroshi Ono, Makoto Kohda, Eiichi Okuno

APPLIED PHYSICS EXPRESS　7　(9)　093001-1-093001-4　2014/09

DOI： 10.7567/APEX.7.093001 　

ISSN： 1882-0778

eISSN： 1882-0786
Direct determination of spin-orbit interaction coefficients and realization of the persistent spin helix symmetry Peer-reviewed

A. Sasaki, S. Nonaka, Y. Kunihashi, M. Kohda, T. Bauernfeind, T. Dollinger, K. Richter, J. Nitta

NATURE NANOTECHNOLOGY　9　(9)　703-709　2014/09

DOI： 10.1038/NNANO.2014.128 　

ISSN： 1748-3387

eISSN： 1748-3395
Platinum layer thickness dependence of spin-Hall induced effective magnetic field in Pt/Co/Pt structures Peer-reviewed

Tim Yang, Makoto Kohda, Takeshi Seki, Koki Takanashi, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　53　(4)　04EM06-1-04EM06-5　2014/04

DOI： 10.7567/JJAP.53.04EM06 　

ISSN： 0021-4922

eISSN： 1347-4065
Giant enhancement of spin detection sensitivity in (Ga,Mn)As/GaAs Esaki diodes Peer-reviewed

Junichi Shiogai, Mariusz Ciorga, Martin Utz, Dieter Schuh, Makoto Kohda, Dominique Bougeard, Tsutomu Nojima, Junsaku Nitta, Dieter Weiss

PHYSICAL REVIEW B　89　(8)　081307-1-081307-5　2014/02

DOI： 10.1103/PhysRevB.89.081307 　

ISSN： 1098-0121

eISSN： 1550-235X
Perpendicular magnetic anisotropy in Pt/Co/AlO trilayer structures depending on AlO thickness and fabrication method Peer-reviewed

Tim Yang, Z. Q. Wang, Makoto Kohda, Takeshi Seki, Koki Takanashi, Junsaku Nitta

ADVANCED CERAMICS AND NOVEL PROCESSING　616　247-251　2014

DOI： 10.4028/www.scientific.net/KEM.616.247 　

ISSN： 1013-9826
Chirality determination of ferromagnetic disk by local Hall effect Peer-reviewed

Ahmet Serdar Demiray, Makoto Kohda, Junsaku Nitta

Applied Physics Letters　103　(12)　122408-1-122408-5　2013/09/16

DOI： 10.1063/1.4821345 　

ISSN： 0003-6951
Voltage-induced coercivity change in FePt/MgO stacks with different FePt thicknesses Peer-reviewed

Yusuke Kikuchi, Takeshi Seki, Makoto Kohda, Junsaku Nitta, Koki Takanashi

JOURNAL OF PHYSICS D-APPLIED PHYSICS　46　(28)　285002-285007　2013/07

DOI： 10.1088/0022-3727/46/28/285002 　

ISSN： 0022-3727
Manipulation of mobile spin coherence using magnetic-field-free electron spin resonance Peer-reviewed

H. Sanada, Y. Kunihashi, H. Gotoh, K. Onomitsu, M. Kohda, J. Nitta, P. V. Santos, T. Sogawa

Nature Physics　9　(5)　280-283　2013/05

DOI： 10.1038/nphys2573 　

ISSN： 1745-2473 1745-2481
Structural and magnetic properties of L10-FePd/MgO films on GaAs and InP lattice mismatched substrates Peer-reviewed

M. Kohda, S. Iimori, R. Ohsugi, H. Naganuma, T. Miyazaki, Y. Ando, J. Nitta

Applied Physics Letters　102　(10)　102411　2013/03/11

DOI： 10.1063/1.4795443 　

ISSN： 0003-6951
Shot noise at the quantum point contact in InGaAs heterostructure Peer-reviewed

Yoshitaka Nishihara, Shuji Nakamura, Kensuke Kobayashi, Teruo Ono, Makoto Kohda, Junsaku Nitta

AIP Conference Proceedings　1566　311-312　2013
Publisher: American Institute of Physics Inc.
DOI： 10.1063/1.4848410 　

ISSN： 1551-7616 0094-243X
Dynamic nuclear spin polarization in an all-semiconductor spin injection device with (Ga,Mn)As/n-GaAs spin Esaki diode Peer-reviewed

J. Shiogai, M. Ciorga, M. Utz, D. Schuh, T. Arakawa, M. Kohda, K. Kobayashi, T. Ono, W. Wegscheider, D. Weiss, J. Nitta

APPLIED PHYSICS LETTERS　101　(21)　212402　2012/11

DOI： 10.1063/1.4767339 　

ISSN： 0003-6951

eISSN： 1077-3118
Spin-orbit induced electronic spin separation in semiconductor nanostructures International-journal Peer-reviewed

Makoto Kohda, Shuji Nakamura, Yoshitaka Nishihara, Kensuke Kobayashi, Teruo Ono, Jun-ichiro Ohe, Yasuhiro Tokura, Taiki Mineno, Junsaku Nitta

NATURE COMMUNICATIONS　3　1038-1082　2012/09

DOI： 10.1038/ncomms2080 　

ISSN： 2041-1723
Anisotropy and Damping in Co2FeAl0.5Si0.5 via Electrical Detection of Ferromagnetic Resonance Peer-reviewed

Lihui Bai, Nobuki Tezuka, Makoto Kohda, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(8)　083001-1-083001-5　2012/08

DOI： 10.1143/JJAP.51.083001 　

ISSN： 0021-4922

eISSN： 1347-4065
Electrical determination of relative chirality direction in a Co/Cu/Co ferromagnetic ring Peer-reviewed

A. S. Demiray, M. Kohda, T. Miyawaki, Y. Watanabe, K. Saito, S. Mitani, K. Takanashi, J. Nitta

APPLIED PHYSICS LETTERS　101　(6)　062409-1-062409-5　2012/08

DOI： 10.1063/1.4743004 　

ISSN： 0003-6951
Gate-controlled persistent spin helix state in (In,Ga)As quantum wells Peer-reviewed

M. Kohda, V. Lechner, Y. Kunihashi, T. Dollinger, P. Olbrich, C. Schoenhuber, I. Caspers, V. V. Bel'kov, L. E. Golub, D. Weiss, K. Richter, J. Nitta, S. D. Ganichev

PHYSICAL REVIEW B　86　(8)　081306(R)-1-081306(R)-4　2012/08

DOI： 10.1103/PhysRevB.86.081306 　

ISSN： 1098-0121
Shot noise suppression in InGaAs/InGaAsP quantum channels Peer-reviewed

Yoshitaka Nishihara, Shuji Nakamura, Kensuke Kobayashi, Teruo Ono, Makoto Kohda, Junsaku Nitta

APPLIED PHYSICS LETTERS　100　(20)　2012/05

DOI： 10.1063/1.4718934 　

ISSN： 0003-6951
Anisotropic Weak Anti-Localization under In-Plane Magnetic Field and Control of Dimensionality via Spin Precession Length Peer-reviewed

Shun Nonaka, Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(4)　4DM01　2012/04

DOI： 10.1143/JJAP.51.04DM01 　

ISSN： 0021-4922
Relative Vortex State Control in a Co/Cu/Co Pseudo-Spin-Valve Ring Peer-reviewed

Ahmet S. Demiray, Tetsuya Miyawaki, Yusuke Watanabe, Makoto Kohda, Kesami Saito, Seiji Mitani, Koki Takanashi, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(4)　04DM04　2012/04

DOI： 10.1143/JJAP.51.04DM04 　

ISSN： 0021-4922
Proposal of spin complementary field effect transistor Peer-reviewed

Yoji Kunihashi, Makoto Kohda, Haruki Sanada, Hideki Gotoh, Tetsuomi Sogawa, Junsaku Nitta

APPLIED PHYSICS LETTERS　100　(11)　113502-1-113502-3　2012/03

DOI： 10.1063/1.3689753 　

ISSN： 0003-6951
MgO Layer Thickness Dependence of Structure and Magnetic Properties of L1(0)-FePt/MgO/GaAs Structures Peer-reviewed

Rento Ohsugi, Makoto Kohda, Takeshi Seki, Akihiko Ohtsu, Masaki Mizuguchi, Koki Takanashi, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　51　(2)　02BM05　2012/02

DOI： 10.1143/JJAP.51.02BM05 　

ISSN： 0021-4922
Experimental Demonstration of Spin Geometric Phase: Radius Dependence of Time-Reversal Aharonov-Casher Oscillations International-journal Peer-reviewed

Fumiya Nagasawa, Jun Takagi, Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

PHYSICAL REVIEW LETTERS　108　(8)　086801-(1)-086801-(4)　2012/02

DOI： 10.1103/PhysRevLett.108.086801 　

ISSN： 0031-9007

eISSN： 1079-7114
Semiclassical approach for spin dephasing in a quasi-one-dimensional channel Peer-reviewed

Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

PHYSICAL REVIEW B　85　(3)　035321-(1)-035321-(7)　2012/01

DOI： 10.1103/PhysRevB.85.035321 　

ISSN： 1098-0121
Coercivity change in an FePt thin layer in a Hall device by voltage application Peer-reviewed

Takeshi Seki, Makoto Kohda, Junsaku Nitta, Koki Takanashi

APPLIED PHYSICS LETTERS　98　(21)　212505-1-212505-3　2011/05

DOI： 10.1063/1.3595318 　

ISSN： 0003-6951
Acoustically Induced Spin-Orbit Interactions Revealed by Two-Dimensional Imaging of Spin Transport in GaAs Peer-reviewed

H. Sanada, T. Sogawa, H. Gotoh, K. Onomitsu, M. Kohda, J. Nitta, P. V. Santos

PHYSICAL REVIEW LETTERS　106　(21)　216602-1-216602-4　2011/05

DOI： 10.1103/PhysRevLett.106.216602 　

ISSN： 0031-9007
Observation of spin wave modes depending on a tunable periodic magnetic field Peer-reviewed

Lihui Bai, Makoto Kohda, Junsaku Nitta

APPLIED PHYSICS LETTERS　98　(17)　172508-1-172508-3　2011/04

DOI： 10.1063/1.3584032 　

ISSN： 0003-6951
Magnitude and sign control of lithography-induced uniaxial anisotropy in ultra-thin (Ga,Mn)As wires Peer-reviewed

J. Shiogai, D. Schuh, W. Wegscheider, M. Kohda, J. Nitta, D. Weiss

APPLIED PHYSICS LETTERS　98　(8)　083101-1-083101-3　2011/02

DOI： 10.1063/1.3556556 　

ISSN： 0003-6951

eISSN： 1077-3118
Suppression of Aharonov-Casher spin interference in an InGaAs ring array Peer-reviewed

Junsaku Nitta, Jun Takagi, Fumiya Nagasawa, Makoto Kohda

INTERNATIONAL SYMPOSIUM: NANOSCIENCE AND QUANTUM PHYSICS 2011 (NANOPHYS'11)　302　012002-1-012002-5　2011

DOI： 10.1088/1742-6596/302/1/012002 　

ISSN： 1742-6588
Anisotropic spin transport affected by competition between spin orbit interaction and Zeeman effect in an InGaAs based wire Peer-reviewed

Junsaku Nitta, Sylvain Moulis, Makoto Kohda

HORIBA INTERNATIONAL CONFERENCE: THE 19TH INTERNATIONAL CONFERENCE ON THE APPLICATION OF HIGH MAGNETIC FIELDS IN SEMICONDUCTOR PHYSICS AND NANOTECHNOLOGY　334　012062-1-012062-5　2011

DOI： 10.1088/1742-6596/334/1/012062 　

ISSN： 1742-6588
Width and temperature dependence of lithography-induced magnetic anisotropy in (Ga,Mn)As wires Peer-reviewed

Kohda, M., Ogawa, J., Shiogai, J., Matsukura, F., Ohno, Y., Ohno, H., Nitta, J.

Physica E: Low-Dimensional Systems and Nanostructures　42　(10)　published online　2010/04

DOI： 10.1016/j.physe.2009.12.019 　
Electrical generation, manipulation and detection of spin wave in permalloy stripe Peer-reviewed

L. H. Bai, M. Kohda, J. Nitta

Japanese Journal of Applied Physics　(49)　04DM01　2010/04
Electrical generation, manipulation and detection of spin wave in permalloy stripe Peer-reviewed

L. H. Bai, M. Kohda, J. Nitta

Jpn. J. Appl. Phys　49　04DM01　2010/04
Enhancement of spin-orbit interaction and the effect of interface diffusion in quaternary InGaAsP/InGaAs heterostructures Peer-reviewed

Makoto Kohda, Junsaku Nitta

PHYSICAL REVIEW B　81　(11)　115118-1-115118-18　2010/03

DOI： 10.1103/PhysRevB.81.115118 　

ISSN： 1098-0121
Electrical Detection of Propagating Spin Waves Controlled by a Local Magnetic Field Induced by a DC Current Peer-reviewed

Lihui Bai, Makoto Kohda, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　49　(4)　04DM01　2010

DOI： 10.1143/JJAP.49.04DM01 　

ISSN： 0021-4922
Enhancement of Rashba Spin-Orbit Interaction Due to Wave Function Engineering Peer-reviewed

Y. Kunihashi, M. Kohda, J. Nitta

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM　23　(1)　49-52　2010/01

DOI： 10.1007/s10948-009-0579-1 　

ISSN： 1557-1939
Electrical spin manipulation with Al(2)O(3) gate insulator in InGaAs based mesoscopic ring arrays Peer-reviewed

Jun Takagi, Makoto Kohda, Junsaku Nitta

PROCEEDINGS OF THE 14TH INTERNATIONAL CONFERENCE ON NARROW GAP SEMICONDUCTORS AND SYSTEMS　3　(2)　1317-1320　2010

DOI： 10.1016/j.phpro.2010.01.183 　

ISSN： 1875-3892
Anisotropic spin splitting in InGaAs wire structures Peer-reviewed

Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

PROCEEDINGS OF THE 14TH INTERNATIONAL CONFERENCE ON NARROW GAP SEMICONDUCTORS AND SYSTEMS　3　(2)　1255-1259　2010

DOI： 10.1016/j.phpro.2010.01.172 　

ISSN： 1875-3892
Experimental demonstration of resonant spin-orbit interaction effect Peer-reviewed

Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

PROCEEDINGS OF THE 14TH INTERNATIONAL CONFERENCE ON NARROW GAP SEMICONDUCTORS AND SYSTEMS　3　(2)　1261-1266　2010

DOI： 10.1016/j.phpro.2010.01.173 　

ISSN： 1875-3892
Spin-Orbit Interaction in an In0.53Ga0.47As/In0.7Ga0.3As Shallow Two-Dimensional Electron Gas Located 5 nm below InP Surface Barrier Peer-reviewed

Makoto Kohda, Toshiya Shibata, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS　49　(4)　04DM02　2010

DOI： 10.1143/JJAP.49.04DM02 　

ISSN： 0021-4922

eISSN： 1347-4065
Proposal for Electrical Detection of Spin Separation with In-plane Magnetic Field in Mesoscopic Stern-Gerlach Spin Filter Invited Peer-reviewed

M. Kohda, J. Ohe, H. Sanada, M. Yamamoto, T. Ohtsuki, J. Nitta

ULTRAFAST PHENOMENA IN SEMICONDUCTORS AND NANOSTRUCTURE MATERIALS XIV　7600　(7600)　76001B　2010

DOI： 10.1117/12.845569 　

ISSN： 0277-786X
Enhancement of Spin Lifetime in Gate-Fitted InGaAs Narrow Wires International-journal Peer-reviewed

Yoji Kunihashi, Makoto Kohda, Junsaku Nitta

PHYSICAL REVIEW LETTERS　102　(22)　226601-1-226601-4　2009/06

DOI： 10.1103/PhysRevLett.102.226601 　

ISSN： 0031-9007

eISSN： 1079-7114
Electrical manipulation of spins in the Rashba two dimensional electron gas systems Peer-reviewed

Junsaku Nitta, Tobias Bergsten, Yoji Kunihashi, Makoto Kohda

JOURNAL OF APPLIED PHYSICS　105　(12)　122402　2009/06

DOI： 10.1063/1.3117232 　

ISSN： 0021-8979
ELECTRONIC AHARONOV-CASHER EFFECT IN INGAAS RING ARRAYS Peer-reviewed

Junsaku Nitta, Mokoto Kohda, Tobias Bergsten

PROCEEDINGS OF THE 9TH INTERNATIONAL SYMPOSIUM ON FOUNDATIONS OF QUANTUM MECHANICS IN THE LIGHT OF NEW TECHNOLOGY　105-+　2009
All-Electrical Detection of the Relative Strength of Rashba and Dresselhaus Spin-Orbit Interaction in Quantum Wires International-journal Peer-reviewed

Matthias Scheid, Makoto Kohda, Yoji Kunihashi, Klaus Richter, Junsaku Nitta

PHYSICAL REVIEW LETTERS　101　(26)　266401-1-266401-4　2008/12

DOI： 10.1103/PhysRevLett.101.266401 　

ISSN： 0031-9007
Suppression of stray field between adjacent rings in one-dimensional ferromagnetic ring arrays Invited Peer-reviewed

M. Kohda, K. Toyoda, T. Miyawaki, A. Fujita, J. Nitta

JOURNAL OF APPLIED PHYSICS　103　(7)　07A714-1-07A714-3　2008/04

DOI： 10.1063/1.2838014 　

ISSN： 0021-8979
High remanent magnetization of L1(0)-ordered FePt thin film on MgO/(001) GaAs Peer-reviewed

Makoto Kohda, Akihiko Ohtsu, Takeshi Seki, Asaya Fujita, Junsaku Nitta, Seiji Mitani, Koki Takanashi

JAPANESE JOURNAL OF APPLIED PHYSICS　47　(4)　3269-3271　2008/04

DOI： 10.1143/JJAP.47.3269 　

ISSN： 0021-4922
Quantum well thickness dependence of spin orbit interaction in gated InP/In0.8Ga0.2As/In0.52Al0.48As asymmetric quantum wells Peer-reviewed

Makoto Kohda, Takayuki Nihei, Junsaku Nitta

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES　40　(5)　1194-1196　2008/03

DOI： 10.1016/j.physe.2007.08.088 　

ISSN： 1386-9477
Manipulating spin-orbit interaction in semiconductors Invited Peer-reviewed

Makoto Kohda, Tobias Bergsten, Junsaku Nitta

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　77　(3)　031008-1-031008-9　2008/03

DOI： 10.1143/JPSJ.77.031008 　

ISSN： 0031-9015
Rashba spin-orbit interaction of in0.53Ga0.47As/ In0.7Ga0.3As/In0.53Ga0.47As shallow two-dimensional electron gas by surface etching Peer-reviewed

Yoji Kunihashi, Takayuki Nihei, Makoto Kohda, Junsaku Nitta

Physica Status Solidi (C) Current Topics in Solid State Physics　5　(1)　322-325　2008
Publisher: Wiley-VCH Verlag
DOI： 10.1002/pssc.200776557 　

ISSN： 1862-6351
Local Hall measurement of magnetization reversal and magnetic interaction in Fe/Au/Fe trilayer rings Peer-reviewed

T. Miyawaki, M. Kohda, A. Fujita, J. Nitta

Physica Status Solidi (C) Current Topics in Solid State Physics　5　(1)　294-297　2008

DOI： 10.1002/pssc.200776554 　

ISSN： 1862-6351
Local Hall measurement of magnetization reversal and magnetic interaction in Fe/Au/Fe trilayer rings Peer-reviewed

T. Miyawaki, M. Kohda, A. Fujita, J. Nitta

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 1　5　(1)　294-297　2008

DOI： 10.1002/pssc.200776554 　

ISSN： 1610-1634
Rashba spin-orbit interaction of In0.53Ga0.47As/In0.7Ga0.3As/In0.53Ga0.47As shallow two-dimensional electron gas by surface etching Peer-reviewed

Yoji Kunihashi, Takayuki Nihei, Makoto Kohda, Junsaku Nitta

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 5, NO 1　5　(1)　322-325　2008

DOI： 10.1002/pssc.200776557 　

ISSN： 1610-1634
Control of interlayer magnetostatic coupling in submicron-sized Fe/Au/Fe rings Peer-reviewed

T. Miyawaki, M. Kohda, A. Fujita, J. Nitta

APPLIED PHYSICS LETTERS　92　(3)　32502-32504　2008/01

DOI： 10.1063/1.2830702 　

ISSN： 0003-6951
Comparison of Gate Sensitivity for Spin Interference Effect between Al(2)O(3) and SiO(2) Gate Insulators on InGaAs Based Mesoscopic Ring Arrays Invited Peer-reviewed

M. Kohda, J. Takagi, J. Nitta

ATOMIC LAYER DEPOSITION APPLICATIONS 4　16　(4)　39-49　2008

DOI： 10.1149/1.2979979 　

ISSN： 1938-5862
EFFECT OF THE ARRAY DISTANCE ON THE MAGNETIZATION CONFIGURATION OF SUBMICORN-SIZED FERROMAGNETIC RINGS Peer-reviewed

T. Miyawaki, K. Toyoda, M. Kohda, A. Fujita, J. Nitta

CONTROLLABLE QUANTUM STATES: MESOSCOPIC SUPERCONDUCTIVITY AND SPRINTRONICS　271-276　2008
Lateral and vertical magnetic interactions in submicron-sized Fe ring arrays and Fe/Au/Fe trilayer ring structures Peer-reviewed

Makoto Kohda, Ken Takagi, Tetsuya Miyawaki, Kazuya Toyoda, Asaya Fujita, Junsaku Nitta

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　46　(4B)　2164-2166　2007/04

DOI： 10.1143/JJAP.46.2164 　

ISSN： 0021-4922
Magnetic interaction of submicron-sized ferromagnetic rings in one-dimensional array Peer-reviewed

T. Miyawaki, K. Toyoda, M. Kohda, A. Fujita, J. Nitta

APPLIED PHYSICS LETTERS　89　(12)　122508(1)-122508(1)　2006/09

DOI： 10.1063/1.2354584 　

ISSN： 0003-6951
Bias voltage dependence of the electron spin injection studied in a three-terminal device based on a (Ga,Mn)As/n(+)-GaAs Esaki diode Peer-reviewed

M. Kohda, T. Kita, Y. Ohno, F. Matsukura, H. Ohno

APPLIED PHYSICS LETTERS　89　(1)　012103　2006/07

DOI： 10.1063/1.2219141 　

ISSN： 0003-6951

eISSN： 1077-3118
Effect of n(+)-GaAs thickness and doping density on spin injection of GaMnAs/n(+)-GaAs Esaki tunnel junction Peer-reviewed

M. Kohda, Y. Ohno, F. Matsukura, H. Ohno

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES　32　(1-2)　438-441　2006/05

DOI： 10.1016/j.physe.2005.12.085 　

ISSN： 1386-9477

eISSN： 1873-1759
Spin injection with three terminal device based on (Ga,Mn)As/n(+)-GaAs tunnel junction Peer-reviewed

T. Kita, M. Kohda, Y. Ohno, F. Matsukura, H. Ohno

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　3　(12)　4164-4167　2006

DOI： 10.1002/pssc.200672865 　

ISSN： 1862-6351
Magnetoresistance oscillations induced by spin orbit interaction and intersubband scattering in a gated InP/In0.8Ga0.2As/In0.52Al0.48As heterostructure Invited Peer-reviewed

Mitsuhiro Abe, Makoto Kohda, Junsaku Nitta

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　3　(12)　4243-4246　2006

ISSN： 1862-6351
Gate controlled crossover from weak localization to weak antilocalization in a narrow gap In0.8Ga0.2As/InP heterostructure Peer-reviewed

Takayuki Nihei, Yoshifumi Suzuki, Makoto Kohda, Junsaku Nitta

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　3　(12)　4239-4242　2006

DOI： 10.1002/pssc.200672827 　

ISSN： 1862-6351
Magnetoresistance oscillations induced by spin orbit interaction and intersubband scattering in a gated InP/In0.8Ga0.2As/In0.52Al0.48As heterostructure Peer-reviewed

Mitsuhiro Abe, Makoto Kohda, Junsaku Nitta

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　3　(12)　4243-4246　2006

DOI： 10.1002/pssc.200672828 　

ISSN： 1862-6351
Electrical electron spin injection with a p(+)-(Ga,Mn)As/n(+)-GaAs tunnel junction Peer-reviewed

M Kohda, Y Ohno, K Takamura, F Matsukura, H Ohno

JOURNAL OF SUPERCONDUCTIVITY　16　(1)　167-170　2003/02

DOI： 10.1023/A:1023282012059 　

ISSN： 0896-1107
Electrical electron spin injection with a p⁺-(Ga,Mn)As/n ⁺-GaAs tunnel junction

M. Kohda, Y. Ohno, K. Takamura, F. Matsukura, H. Ohno

Journal of Superconductivity and Novel Magnetism　16　(1)　167-170　2003

ISSN： 1557-1939

eISSN： 1557-1947
A spin Esaki diode Peer-reviewed

M Kohda, Y Ohno, K Takamura, F Matsukura, H Ohno

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS　40　(12A)　L1274-L1276　2001/12

DOI： 10.1143/JJAP.40.L1274 　

ISSN： 0021-4922

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Misc. 28

Spintronic Terahertz Emission and Magnetic Anisotropy of Epitaxial Platinum Heterostructures on MgO(110) Substrate

Tetsukawa Shoei, Liu Shuang, Mag-Usara Valynn Katrine, Agulto Verdad Canila, Kohda Makoto, Thompson Ryan, Gamou Hiromu, Du Ye, Karube Shutaro, Nitta Junsaku, Tani Masahiko, Asakawa Makoto, Nakajima Makoto

IEEE Conference Proceedings　2021　(IRMMW-THz)　2021

DOI： 10.1109/IRMMW-THz50926.2021.9566960 　

ISSN： 2162-2027

eISSN： 2162-2035
Magnetics and Optics Research FOREWORD

Satoshi Okamoto, Hiro Munekata, Taichi Goto, Makoto Kohda, Iwao Matsuda, Koji Sekiguchi, Yu Shiratsuchi, Roman Antos

JAPANESE JOURNAL OF APPLIED PHYSICS　59　2020/04

DOI： 10.35848/1347-4065/ab75dd 　

ISSN： 0021-4922

eISSN： 1347-4065
第9回固体におけるスピン現象の物理と応用に関する国際会議(PASPS9)

好田誠

固体物理　52　(1)　41-46　2017/01
Publisher: アグネ技術センター
ISSN： 0454-4544
スピン軌道相互作用の新展開

好田誠, 眞田治樹

83　2014/04
Publisher: 応用物理学会誌
27aAW-2 Observation of Spin Shot Noise

Arakawa T., Shiogai J., Ciorga M., Utz M., Schuh D., Kohda M., Nitta J, Bougeard D., Weiss D., Ono T., Kobayashi K.

Meeting abstracts of the Physical Society of Japan　69　(1)　690-690　2014/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Cutting edge of spin orbit interaction in semiconductors

83　(3)　200-204　2014/03
Publisher: 応用物理学会
ISSN： 0369-8009
Anisotropic Altshuler-Aronov-Spivak interference in an InGaAs mesoscopic ring in a parallel magnetic Field

Nagasawa Fumiya, Tantiamornpong Sirimon, Kohda Makoto, Nitta Junsaku

Meeting abstracts of the Physical Society of Japan　68　(2)　606-606　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Spin polarized current in Rashba supperlattice structure

Ohe Jun-ichiro, Kohda Makoto, Nitta Junsaku

Meeting abstracts of the Physical Society of Japan　68　(2)　606-606　2013/08/26
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
半導体のスピン軌道相互作用を用いたシュテルン－ゲルラッハの実験

好田誠, 大江純一郎

48　(6)　255-268　2013/06
Publisher: 固体物理
ISSN： 0454-4544
半導体における永久スピン旋回状態のゲート制御

好田誠, 国橋要司, 新田淳作

8　2013/05
Publisher: まぐね
21aFB-4 Shot noise suppression in InGaAs/InGaAsP quantum channels

Nishihara Y., Nakamura S., Chida K., Arakawa T., Tanaka T., Chiba D., Kobayashi K., Ono T., Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　67　(2)　651-651　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pFB-6 Manipulation of topological phases of electron spin by in-plane magnetic field

Nagasawa F., Takagi J., Kunihashi Y., Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　67　(2)　654-654　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pFH-7 Electrical spin generation and manipulation by gate electric field in semiconductor nanostructures

Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　67　(2)　783-783　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
19pFH-7 Electrical spin generation and manipulation by gate electric field in semiconducter nanostructures

Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　67　(2)　424-424　2012/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
27aCE-11 Spin current induced by the non-uniform Rashba effect and quantum point contact

Ohe Jun-ichiro, Kohda Makoto, Nitta Junsaku

Meeting abstracts of the Physical Society of Japan　67　(1)　756-756　2012/03/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aRA-4 Coercivity Modulation in an FePt Thin Film by Voltage Application

Seki T., Kohda M., Nitta J., Takanashi K.

Meeting abstracts of the Physical Society of Japan　66　(2)　440-440　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21aTL-8 Spin and Charge currents induced by the time dependent spin orbit interaction

Ohe Jun-ichiro, Kohda Makoto, Nitta Junsaku

Meeting abstracts of the Physical Society of Japan　66　(2)　664-664　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
21pPSA-7 Nonequilibrium current noise at a quantum point contact on InGaAs/InGaAsP II

Nishihara Y., Nakamura S., Chida K., Arakawa T., Kobayashi K., Ono T., Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　66　(2)　672-672　2011/08/24
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Magnitude and sign control of lithography-induced uniaxial anisotropy in ultrathin (Ga, Mn) As wires (vol 98, 083101, 2011)

J. Shiogai, D. Schuh, W. Wegscheider, M. Kohda, J. Nitta, D. Weiss

APPLIED PHYSICS LETTERS　98　(16)　2011/04

DOI： 10.1063/1.3581213 　

ISSN： 0003-6951
26aPS-90 Nonequilibrium current noise at a quantum point contact on InGaAs/InGaAsP

Nishihara Y., Nakamura S., Chida K., Arakawa T., Kobayasih K., Ono T., Kohda M., Nitta J.

Meeting abstracts of the Physical Society of Japan　66　(1)　712-712　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
25aHD-9 Current Noise Measurement of an InGaAs Quantum Point Contact

Nakamura Shuji, Nitta Junsaku, Nishihara Yoshitaka, Chida Kensaku, Arakawa Tomonori, Sekiguchi Koji, Chiba Daichi, Kobayashi Kensuke, Ono Teruo, Kohda Makoto

Meeting Abstracts of the Physical Society of Japan　66　(0)　694-694　2011
Publisher: The Physical Society of Japan
ISSN： 1342-8349
21aTL-5 Electrical spin generation by Rashba spin-orbit interaction in InGaAs quantum point contacts

Kohda M, Nakamura S, Nishihara Y, Kobayashi K, Ono T, Tokura Y, Nitta J

Meeting Abstracts of the Physical Society of Japan　66　(0)　664-664　2011
Publisher: The Physical Society of Japan
ISSN： 1342-8349
21aTM-4 Current Noise Measurement of an InGaAs Quantum Point Contact

Nakamura Shuji, Nitta Junsaku, Nishihara Yoshitaka, Chida Kensaku, Arakawa Tomonori, Sekiguchi Koji, Chiba Daichi, Kobayashi Kensuke, Ono Teruo, Kohda Makoto

Meeting Abstracts of the Physical Society of Japan　66　(0)　667-667　2011
Publisher: The Physical Society of Japan
ISSN： 1342-8349
半導体中のスピン寿命の増大に成功

新田淳作, 好田誠, 国橋要司

92　899-900　2009/07
Publisher: 電子情報通信学会誌
Perpendicularly Magnetized L1_0-FePt / MgO Epitaxially grown on GaAs for Electrical Spin Injection

KOHDA Makoto, OHTSU Akihiko, SEKI Takeshi, FUJITA Asaya, NITTA Junsaku, TAKANASHI Koki

2007　688-689　2007/09/19
Lateral and vertical magnetic interaction in a submicron-sized Fe monolayer and a Fe/Au/Fe trilayer ring structure

KOHDA Makoto, TAKAGI Ken, MIYAWAKI Tetsuya, TOYODA Kazuya, FUJITA Asaya, NITTA Junsaku

2006　564-565　2006/09/13
27pXJ-7 Spin injection into semiconductors

Kohda M, Ohno Y, Matsukura F, Ohno H

Meeting abstracts of the Physical Society of Japan　59　(1)　465-465　2004/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Spin injection into non-magnetic semiconductors using ferromagnetic semiconductor

Ohno Y., Kohda M., Takamura K., Matsukura F., Ohno H.

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

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Books and Other Publications 1

スピントロニクスハンドブック

好田誠

(株)エヌ・ティー・エス　2023/05

ISBN: 9784860438425

Presentations 103

Spin-orbit interaction in semiconductor nanowires towards Majorana fermion Invited

Makoto Kohda

Emerging platforms of quantum computing　2023/04/10
半導体ナノ界面におけるスピン軌道相互作用と電子スピン波物性への展開 Invited

好田誠

2022 年度第 2 回界面ナノ科学研究会　2023/03/19
Persistent spin helix state towards wave-based information processing Invited

Makoto Kohda

International Workshop for Spin/Quantum Materials and Devices　2023/02/24
永久スピン旋回状態を用いたスピン空間制御と機能開拓 Invited

好田誠

新世代研究所2022年度第1回スピントロニクス研究会　2022/10/12
室温量子情報処理に向けたワイドギャップ半導体スピン欠陥への電気･光学的スピン注入によるスピン状態制御

好田誠

量研-東北大マッチング研究支援事業 2022年度キックオフ・ワークショップ　2022/09/29
スピンを活用した次世代情報処理基盤の創成 Invited

好田誠

NEDO×東北大ビジョナリーワークショップ　2022/07/22
半導体スピントロニクス Invited

好田誠

第２０回スピントロニクス入門セミナー　2022/03/29
Full spin–orbit coefficient in semiconductor nanowires based on weak localization anisotropy under in-plane magnetic field

Makoto Kohda

2021/03/19
電子スピン波情報担体創発に向けた物性開拓 Invited

好田誠

日本物理学会領域4領域1領域3合同シンポジウム　2021/03/12
Helical spin wave in III-V semiconductor heterosturctures Invited

Makoto Kohda

Tohoku-Lorraine Joint conference　2021/03/03
Full spin-orbit coefficinet in III-V semiconductor nanowires based on weak localization anisotropy Invited

The 4th International Symposium for The Core Research Cluster for Spintronics　2021/02/25
半導体量子構造におけるスピン軌道相互作用の微視的起源とメゾスコピック物性 Invited

好田誠

第16回界面スピン軌道研究会/第14回界面多極子研究会　2021/01/23
半導体スピントロニクス Invited

好田誠

第19回スピントロニクス入門セミナー　2021/01/07
Spintronics and valleytronics in semiconductor nanostructures Invited

Makoto Kohda

TVS-Advanced Materials international workshop　2020/11/13
Spin manipulation by spin momentum locking in Rashba two-dimensional system Invited

3rd EPiQS-TMS alliance workshop on Topological Phenomena in Quantum Materials　2019/10/23
Spin manipulation by spin-momentum locking in a two-dimensional Rashba system Invited

M. Kohda

SPIE NanoScience and Engineering Spintronics XII　2019/08/11
半導体におけるゲート電界スピン生成と制御

2012年秋季日本物理学会領域3，4，7シンポジウムデバイス物理の新展開―電界効果の物質科学―　2012/09/20
Gate controlled long spin relaxation times in the persistent spin helix state in semiconductors International-presentation

The 7th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors (PASPS VII)　2012/08/01
Electronic Stern-Gerlach experiment by Rashba spin orbit interaction International-presentation

The 31st International Conference on the Physics of Semiconductors (ICPS 2012)　2012/07/25
Electrical spin generation and manipulation by spin orbit interaction in semiconductor nanostrctures International-presentation

The 9th RIEC International Workshop on Spintronics　2012/06/01
InGaAs量子ポイントコンタクトにおけるスピン偏極の起源

第59回応用物理学会関係連合講演会　2012/03/16
半導体ナノ構造における電気的スピン生成と制御

ディラック電子とスピントロニクスシンポジウム東邦大学物理学科・東邦大学複合物性研究センター共催　2011/12/03
InGaAs量子ポイントコンタクトによる電気的スピン生成

電力中央研究所材料科学研究所若手ワークショップ先端技術の最新のトピック―新しいデバイスの創製へ向けて―　2011/11/18
InGaAs量子ポイントコンタクトによるスピン流生成

スピン流と熱効果の新現象応用物理学会スピントロニクス研究会・日本磁気学会スピンエレクトロニクス専門研究会共同主催研究会　2011/11/15
InGaAs量子ポイントコンタクトを用いたRashbaスピン軌道相互作用による電気的スピン生成

日本物理学会2011年秋季大会　2011/09/21
Spin generation and detection by spin orbit interaction in semiconductors

東京大学量子相エレクトロニクス研究センター G-COEプログラム―未来を拓く物理化学結集教育研究拠点― QPECセミナー　2011/08/13
Electrical spin generation by Rashba spin orbit interaction in InGaAs quantum point contacts International-presentation

6th International school and conference on spintronics and quantum information technology　2011/08/05
Zero field spin polarization by Rashba spin orbit interaction in quantum point contacts International-presentation

5th International Workshop on Spin Currents　2011/07/26
半導体スピン軌道相互作用によるスピン制御とスピン生成

第1回「固体材料における電界効果の物理と応用の進展－若手ミニワークショップ－」　2011/06/04
スピン軌道相互作用を用いた電気的スピン制御とその応用

好田誠

特定領域スピン流の創出と制御第3回若手研究交流会　2011/02
Spin polarization in InGaAs quantum point contacts at zero magnetic field International-presentation

International Symposium on Nanoscale Transport and Technology　2011/01/14
Analytical approach for spin relaxation in quasi-one-dimensional channel

Y. Kunihashi, M. Kohda, J. Nitta

第15回「半導体スピン工学の基礎と応用」研究会 (PASPS15)　2010/12
Magnitude control of lithography-induced uniaxial anisotropy”

J. Shiogai, D. Shuh, W. Wegscheider, M. Kohda, J. Nitta, D. Weiss

第15回「半導体スピン工学の基礎と応用」研究会 (PASPS15)　2010/12
半導体量子井戸における輸送中スピン歳差運動の表面弾性波による制御

眞田治樹, 後藤秀樹, 好田誠, 新田淳作, 小野満恒二, 寒川哲臣

第71回応用物理学会学術講演会　2010/09/16
InGaAs量子井戸におけるスピン緩和の量子井戸幅依存性

国橋要司, 好田誠, 新田淳作

第71回応用物理学会学術講演会　2010/09/14
Electrical spin injection and trials for observation of spin Hall effects in all semiconductor lateral structures

塩貝純一, Mariusz Ciorga, Cheng Song, Dieter Schuh, Werner Wegscheider, 好田誠新田淳作, Dieter Weiss

第71回応用物理学会学術講演会　2010/09/14
InGaAs 2DEG量子ポイントコンタクトによるスピン偏極生成

好田誠, 小林俊之, 新田淳作

第71回応用物理学会学術講演会　2010/09/14
Enhancement of spin-orbit interaction and the effect of interface diffusion in quaternary InGaAsP/InGaAs heterostructures International-presentation

The 6th International Conference on the Physics and Applications of Spin Related Phenomena in Semicondcutors　2010/08/02
Spin orbit interaction in an In0.53Ga0.47As / In0.7Ga0.3As shallow two dimensional electron gas for spin injection and detection International-presentation

30th International Conference on the Physics of Semiconductors　2010/07/27
Spin wave modes and spin wave propagation toward magnonic crystals International-presentation

L. Bai, M. Kohda, J. Nitta

2nd International Symposium on Advanced Magnetic Materials and Applications　2010/07
スピン軌道相互作用の結晶方位依存性がスピン緩和へ及ぼす影響

国橋要司, 好田誠, 新田淳作

第57回応用物理学関係連合講演会　2010/03
InGaAsリング配列を用いた電気的スピン制御と面内磁場がスピン干渉効果に与える影響

高木淳, 好田誠, 新田淳作

第57回応用物理学関係連合講演会　2010/03
半導体細線構造におけるRashba及びDresselhausスピン軌道相互作用の相対的強さの電気的検出

Moulis Sylvain, 好田誠, 新田淳作

第57回応用物理学関係連合講演会　2010/03
Gate controlled persistent spin helix state in InGaAs wire structures

国橋要司, 好田誠, 新田淳作

第14回半導体スピン工学の基礎と応用　2009/12
Electrical detection of propagating spin waves in a permalloy strip

Lihui Bai, 好田誠, 新田淳作

第14回半導体スピン工学の基礎と応用　2009/12
A new spin wave device by electrical excitation, manipulation and detection

Lihui Bai, 好田誠, 新田淳作

金研若手研究会　2009/12
Electrical control of spin manupilation in InGaAs based antidot lattices

F. Satoh, M. Kohda, J. Nitta

第8回スピントロニクス入門セミナー・若手研究会　2009/11
Electrical spin manipulation with Al2O3 gate insulator in InGaAs based mesoscopic ring array

J. Takagi, M. Kohda, J. Nitta

第8回スピントロニクス入門セミナー・若手研究会　2009/11
Propagating spin wave in a permalloy strip and its excitation, manipulation and detection

Lihui Bai, 好田誠, 新田淳作

第8回スピントロニクス入門セミナー・若手研究会　2009/11
Enhancement of spin orbit interaction in quaternary InGaAsP/InGaAs heterostructures International-presentation

M. Kohda, J. Nitta

RIEC-CNS Workshop on Nanoelectronics, Spintronics and Photonics　2009/10
Propagating spin waves in a permalloy strip and its excitation, manipulation and detection International-presentation

L. Bai, M. Kohda, J. Nitta

RIEC-CNS Workshop on Nanoelectronics, Spintronics and Photonics　2009/10
Spin orbit interaction in an In0.53Ga0.47As/In0.7Ga0.3As shallow two dimensional electron gas for electrical spin injection and detection

M. Kohda, T. Shibata, J. Nitta

International Conference on Solid State Devices and Materials　2009/09
Electrical excitation,manipulation and detection of spin waves in a permalloy strip

L. Bai, M. Kohda, J. Nitta

International Conference on Solid State Devices and Materials　2009/09
InGaAs準一次元チャネルにおけるスピン緩和長の結晶方位依存性

国橋要司, 好田誠, 新田淳作

第70回応用物理学会学術講演会　2009/09
4元系InGaAsP/InGaAsへテロ界面を用いたスピン軌道相互作用の増大

好田誠, 新田淳作

第70回応用物理学会学術講演会　2009/09
Spin dependent current induced by spatial gradient of spin orbit interaction in Y-branch shaped narrow wire structures International-presentation

M. Kohda, J. Nitta

14th International Conference on Narrow Gap Semiconductors and Systems　2009/07
Electrical control of spin interaction in antidot lattice of InGaAs International-presentation

F.Satoh, M. Kohda, J. Nitta

14th International Conference on Narrow Gap Semiconductors and Systems　2009/07
Electrical spin manipulation with Al2O3 gate insulator in InGaAs based mesoscopic ring array International-presentation

J. Takagi, M. Kohda, J. Nitta

14th International Conference on Narrow Gap Semiconductors and Systems　2009/07
Rashba spin orbit interaction in a quaternary InGaAsP / InGaAs heterostructure International-presentation

M. Kohda, J. Nitta

14th International Conference on Narrow Gap Semiconductors and Systems　2009/07
Anisotropy of spin-orbit interaction in InGaAs wire structure International-presentation

Y. Kunihashi, M. Kohda, J. Nitta

14th International Conference on Narrow Gap Semiconductors and Systems　2009/07
Spin dependent current induced by spatial gradient of spin orbit interaction in Y-branch shaped narrow wire structures International-presentation

M. Kohda, J. Nitta

The 18th International Conference on Electronic Properties of Two-Dimensional Systems　2009/07
Suppression of spin relaxation due to dimensional confinement and resonant spin-orbit interaction effect International-presentation

Y. Kunihashi, M. Kohda, J. Nitta

The 18th International Conference on Electronic Properties of Two-Dimensional Systems　2009/07
サイドゲート付き半導体Y字型細線における面内磁場の影響

好田誠, 金田淳, 新田淳作

第56回応用物理学会関係連合講演会　2009/04
InGaAs細線構造におけるスピン緩和の結晶方位依存性

国橋要司, 好田誠, 新田淳作

第56回応用物理学会関係連合講演会　2009/04
L10-FePt / MgO / GaAs-based LED構造を用いた電気的スピン注入におけるMgOバリア層の影響”

宮脇哲也, 好田誠, 眞田治樹, 後藤秀樹, 三谷誠司, 高梨弘毅, 新田淳作

第56回応用物理学会関係連合講演会　2009/04
GaMnAs細線構造における磁気異方性

小川純史, 好田誠, 松倉文礼, 大野裕三, 大野英男, 新田淳作

第56回応用物理学会関係連合講演会　2009/04
Contribution of Dresselhaus spin orbit interaction in (001) and (110) AlGaAs/GaAs two dimensional electron gases International-presentation

M. Kohda, T. Kojima, Y. Ohno, H. Ohno, J. Nitta

UC Santa Barbara CNSI-RIEC Worksho　2008/10
25.“(001)GaAs基板および(001)InP基板上へのFePt / MgO成長と磁気特性の比較”

宮脇哲也, 好田誠, 三谷誠司, 高梨弘毅, 藤田麻哉, 新田淳作

第69回応用物理学会学術講演会　2008/09
Al0.3Ga0.7As / GaAs逆HEMT構造におけるスピン軌道相互作用のゲート電界制御

好田誠, 小嶋隆幸, 大野裕三, 大野英男, 新田淳作

第69回応用物理学会学術講演会　2008/09
InGaAs細線構造における次元制御を用いたスピン緩和の抑制

国橋要司, 好田誠, 新田淳作

第69回応用物理学会学術講演会　2008/09
Spin interference of squre and triangular lateral antidot lattices in InP/InGaAs heterostructures International-presentation

Internationla Conference on Spin related phenomena in Semiconductor　2008/08/03
Enhancement of Rashba Spin-Orbit Interaction due to wave function engineering in In0.70Ga0.30As /In0.53Ga0.47As/ In0.52Al0.48As heterostructures International-presentation

Y. Kunihashi, M. Kohda, J. Nitta

International conference on physics and applications of spin-related phenomena in semiconductor　2008/08
Spin interference of square and triangular lateral antidot lattices in InP / InGaAs heterostructures International-presentation

F. Satoh, M. Kohda, J. Nitta

International conference on physics and applications of spin-related phenomena in semiconductor　2008/08
Gate voltage control of spin orbit interaction in AlGaAs/GaAs inverted HEMT structure

International conference on physics of semiconductor　2008/07/26
Gate Controlled Spin Relaxation and Rashba Spin-Orbit Interaction in InP / InGaAs / InAlAs Quantum Wire

Y. Kunihashi, M. Kohda, J. Nitta

International conference on physics of semiconductor　2008/07/26
InGaAs量子井戸を用いたメゾスコピックリング配列によるスピン干渉効果の電気的検出

高木淳, 好田誠, 新田淳作

第55回応用物理学会関係連合講演会　2008/03
InGaAs量子細線におけるスピン軌道相互作用のゲート電界制御と弱反局在効果の消失

国橋要司, 好田誠, 新田淳作

第55回応用物理学会関係連合講演会　2008/03
狭ギャップ半導体InGaAs2次元電子ガスを用いたアンチドット正方格子の磁気輸送測定

佐藤史隆, 好田誠, 新田淳作

第54回応用物理学関係連合講演会　2008/03
Inner diameter dependence of magnetostatic interaction in one dimensional Fe ring arrays International-presentation

International coference on magnetism and magentic materials　2007/11
Pependicular magnetized L10-FePt / MgO epitaxillay grown on GaAs for electrical spin injection International-presentation

International conference on solid state devices and materials　2007/09
Quantum well thickness dependence of spin orbit interaction in InAlAs / InGaAs / InP asymmetric quantum wells International-presentation

International conference on electronic properties of two-dimensional systems and modulated semiconductor structures　2007/07
Interface and field contribution of Rashba spin orbit interaction in different width of InGaAs / InP quantum wells International-presentation

4th international school and conference on spintronics and quantum information technology　2007/06
InAlAs/InGaAs/InP非対称量子井戸におけるスピン軌道相互作用の井戸幅依存性

第54回応用物理学関係連合講演会　2007/03
Lateral and vertical magnetic interaction in submicron-sized Fe monolayer and Fe/Au/Fe trilayer ring arrays International-presentation

International conference on solid state devices and materials　2006/09
微小磁性体リングアレイのリング内径変化に伴う磁化過程への影響

第67回応用物理学会学術講演会　2006/09
Magnetization reversal process and interlayer coupling of a submicron-sized Fe/Au/Fe trilayer ring array International-presentation

19th international colloquium on magnetic films and surfaces　2006/08
Gate controlled crossover from weak antilocalization to weak localization in a narrow gap InGaAs / InP heterostructure

第3回物質材料若手学校　2006/08
Spin injection with three terminal device based on GaMnAs / n+-GaAs tunnel junction International-presentation

International Symposium on Mesoscopic Superconductivity and Spintronics　2006/03
Ballistic spin injection spectroscopy of GaMnAs spin Esaki diode International-presentation

APS March Meeting　2006/03
GaMnAs/n+-GaAsトンネル接合を用いた3端子素子によるスピン注入

第53回応用物理学関係連合講演会　2006/03
Dependence of spin injection efficiency on n+-GaAs thickness in GaMnAs/n+-GaAs Esaki tunnel junctions International-presentation

The 3rd International Conference on Semiconductor Spintronics and Quantum Information Technology　2005/08/01
Effect of different n+-GaAs thickness/doping density on spin injection of GaMnAs/n+-GaAs Esaki tunnel junctions International-presentation

The 12th International Conference on Modulated Semiconductor Structures　2005/07/10
n+-GaAs膜厚の異なるGaMnAs/n+-GaAsトンネル接合を用いた電気的電子スピン注入

第52回応用物理学会関係連合講演会　2005/03/29
半導体へのスピン注入

日本物理学会第59回年次大会　2004/03/27
Faraday rotation detection of injected electron spins in quantum wells International-presentation

The 2nd international Conference on Semiconductor Spintronics and Quantum Information Thechnology　2003/08/04
Electrical electron spin injection with Esaki diode structure International-presentation

The 26th International Conference on Physics of Semiconductors　2002/07/29
Electrical electron spin injection with a p+-(Ga,Mn)As/n+-GaAs tunnel junction International-presentation

The 2nd International Conference on Physics and Application of Spin Related Phenomena in Semiconductors　2002/07/23
(Ga,Mn)As/n+-GaAsトンネル接合を用いた電気的なスピン偏極電子注入

第49回応用物理学会関係連合講演会　2002/03/27
Electrical electron spin injection with (Ga,Mn)As/n+-GaAs tunnel junction International-presentation

International Symposium on Mesoscopic Superconductivity and Spintronics　2002/03/04
Interband tunnel injection of spin polarized carriers

The 6th Symposium on Atomic-scale Surface and Interface Dynamics　2002/03/01
Interband tunnel injection of spin polarized carriers

The 7th Symposium on the Physics and Application of Spin Related Phenomena in Semiconductors　2001/12/17
(Ga,Mn)As/n-GaAsバンド間トンネル接合の作製とその評価

第62回応用物理学会学術講演会　2001/09/11
ヘリカルスピントロニクス-電子スピン波が生み出す新奇スピン物性とその制御 Invited

好田誠

物性談話会　2020/11/08

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Industrial Property Rights 29

電子スピン波の多重伝送方法および電子スピン波の多重伝送装置

好田誠, 曽根原純平, 飯笹大介, 新田淳作

特許第7658551号

Property Type: Patent
電子スピン波の波長変換装置、演算装置、および電子スピン波の位相変調装置

古舘海生, 菊池奎斗, 小田川武史, 菅原楓大, 関剛斎, 山本壮太, 石原淳, 好田誠

特許第7609502号

Property Type: Patent
スピン軌道トルク生成効率の制御方法

国橋要司, 田中祐輔, 眞田治樹, 後藤秀樹, 寒川哲臣, 軽部修太郎, 菅原大地, 好田誠, 新田淳作

特許第7174954号

Property Type: Patent
スピン軌道相互作用の増大方法

国橋要司, 眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 蒲生寛武, 榎涼斗

特許第6792841号

Property Type: Patent
スピン軌道相互作用の制御方法

国橋要司, 眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 柳淀春, ゴンミンシック

特許第6667827号

Property Type: Patent
電子スピン制御方法

眞田治樹, 国橋要司, 後藤秀樹, 寒川哲臣, 好田誠, 青木あすか, 新田淳作

特許第6222737号

Property Type: Patent
スピン装置および磁化反転測定方法

国橋要司, 眞田治樹, 田中祐輔, ▲軽▼部修太郎, 好田誠, 新田淳作

Property Type: Patent
アナログメモリ素子およびニューラルネットワーク

国橋要司, 眞田治樹, 田中祐輔, 後藤秀樹, 輕部修太郎, 田中貴大, 好田誠, 新田淳作

Property Type: Patent
電流検出装置

青建一, 河野欣, 吉村政洋, 好田誠, 輕部修太郎, 新田淳作

Property Type: Patent
電子スピン波の多重伝送・分離検出方法

好田誠, 曽根原純平, 飯笹大介, 新田淳作

Property Type: Patent
スピン材料およびスピン軌道トルク生成効率の制御方法

国橋要司, 田中祐輔, 眞田治樹, 後藤秀樹, 中川原圭太, 軽部修太郎, 好田誠, 新田淳作

Property Type: Patent
スピン材料およびスピン軌道トルク生成効率の制御方法

国橋要司, 田中祐輔, 眞田治樹, 後藤秀樹, 寒川哲臣, 軽部修太郎, 菅原大地, 好田誠, 新田淳作

Property Type: Patent
スピン流制御装置

国橋要司, 後藤秀樹, 眞田治樹, 田中祐輔, 寒川哲臣, 好田誠, 飯笹大介, 新田淳作

Property Type: Patent
スピン流制御装置

国橋要司, 後藤秀樹, 眞田治樹, 田中祐輔, 寒川哲臣, 好田誠, 飯笹大介, 新田淳作

Property Type: Patent
スピン軌道相互作用の増大方法およびスピンデバイス

国橋要司, 眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 蒲生寛武, 榎涼斗

Property Type: Patent
スピン軌道相互作用の制御方法

国橋要司, 眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 柳淀春, ゴンミンシック

Property Type: Patent
スピン熱電変換素子

水沼広太朗, 才賀裕太, 河野欣, 新田淳作, 好田誠

Property Type: Patent
デバイス

水沼広太朗, 才賀裕太, 河野欣, 新田淳作, 好田誠

Property Type: Patent
接合構造

眞田治樹, 国橋要司, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作

Property Type: Patent
電子スピン制御装置および制御方法

眞田治樹, 国橋要司, 後藤秀樹, 寒川哲臣, 好田誠, 青木あすか, 新田淳作

Property Type: Patent
熱電変換素子

河野欣, 才賀裕太, 水沼広太朗, 好田誠, 小野宏史, 柳淀春

Property Type: Patent
トランジスタおよびその製造方法

好田誠, 永沼博, 遠藤恭, 関剛斎, 宮崎孝道

Property Type: Patent
スピン装置およびその製造方法

眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 大橋達郎

Property Type: Patent
スピン装置およびその製造方法

眞田治樹, 後藤秀樹, 寒川哲臣, 好田誠, 新田淳作, 大橋達郎

特許第5920927号

Property Type: Patent
アナログメモリ素子およびニューラルネットワーク

輕部修太郎, 田中貴大, 好田誠, 新田淳作

Property Type: Patent
電流検出装置

好田誠、輕部修太郎、新田淳作他

Property Type: Patent
電子スピン波の多重伝送装置

好田誠, 関剛斎, 弓仲康史, 植村哲也

Property Type: Patent
スピン材料およびスピン軌道トルク生成効率の制御方法

国橋要司, 田中祐輔, 眞田治樹, 後藤秀樹, 寒川哲臣, 軽部修太郎, 菅原大地, 好田誠, 新田淳作

Property Type: Patent
スピン流制御装置

好田誠, 国橋要司, 後藤秀樹, 眞田治樹, 田中祐輔, 寒川哲臣, 飯笹大介, 新田淳作

Property Type: Patent

Show all Show first 5

Research Projects 32

Exploration of novel valley, optical, and spin functions in two-dimensional atomic layer materials based on strain control

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2024/06/28 - 2027/03/31
波動性情報担体を用いた固体多重情報基盤の創出

好田誠

Offer Organization: 科学技術振興機構

System: 戦略的創造研究推進事業

Category: CREST[情報担体]情報担体を活用した集積デバイス・システム

Institution: 東北大学

2022/10 - 2027

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電気伝導・光学応答共に優れたIII-V族半導体量子構造や強磁性体とのハイブリッド構造を舞台に、偏光多重された光情報を一括して電子スピン波へと転写するトランスデューサーを構築します。そして、この技術基盤に立脚した光電融合型の演算処理を行います。さらに、電子スピン波からマグノンへの相互変換を構築することで、システム全体で波動性を活用できる多重情報処理基盤を確立します。
電子スピン波情報担体の創発

好田誠

Offer Organization: 科学技術振興機構

System: 戦略的な研究開発の推進創発的研究支援事業

Institution: 東北大学

2021 - 2027

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電子スピンが回転しながら空間伝搬するスピンの「波」を新たな情報担体に利用する学理構築と原理実証を目指します。半導体の電子スピン波は長い寿命と優れた制御性を兼ね備え、光情報通信の独壇場であった波の並列・多重性を、半導体に組み込むことが可能となります。半導体素子のスケーラビリティと融合させ、既存技術の延長線上にない方法で、膨大な情報量を伝送・処理できる固体スピン波情報プラットフォームを構築します。
Realization of novel information processing and transmission using electron spin waves

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04 - 2026/03
半導体およびトポロジカル物質のスピン軌道ナノ構造を用いた量子状態制御

好田誠

Offer Organization: 科学技術振興機構

System: 国際的な科学技術共同研究などの推進先端国際共同研究推進事業単独公募(次世代)

Institution: 東北大学

2023 - 2026

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本研究は、スピン軌道相互作用の強い半導体やトポロジカル絶縁体と超伝導体とのハイブリッド接合を用いて、トポロジカルおよびスピン量子ビットに向けた新奇束縛状態の観測と制御を目指す。そのためにドイツ・ユーリッヒ研究センターと東北大学および理化学研究所の3拠点4チームで研究体制を構築する。ドイツ側チームは高品位結晶成長技術に基づく半導体/超伝導接合の形成とデバイス特性評価を進め、日本側チームはスピン軌道相互作用の精密測定に基づくデバイス最適化と高周波トンネル分光による新奇束縛状態の観測を進める。両国の量子技術ネットワークに基づき相互連携することで若手研究者の国際頭脳循環を促進する枠組みを構築する。
Ultrafast control of antiferromagnetic nanostructures

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Tohoku University

2022/10/07 - 2025/03/31
Control of magnetization by terahertz pulses and ferromagnetic spin dynamics

NAKAJIMA MAKOTO

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Osaka University

2020/04/01 - 2023/03/31

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We performed the research on ultrafast spectroscoy to clarify the ultrafast spin dynamics under terahertz wave excitation and optical excitation. We experimentally demonstrated the contribution of magnon by electronic excitation and phonon excitation in the photoexcitation process, and the direct excitation and control of magnon by terahertz excitation. Terahertz emission from photoexcited spin currents has also been investigated. Control of the terahertz-excited spin reorientation transition was achieved by resonance excitation of the magnetic mode using the terahertz magnetic field enhancement effect of metamaterials. We also succeeded in measuring the spatio-temporal distribution of the electric field contraction process of the Coulomb field induced by the relativistic electron beam pulse by using the electro-optical effect using terahertz wave technology.
Observation of self-induced spin torque in a single ferromagnet and demonstration of novel rf generator

Seki Takeshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2018/06/29 - 2020/03/31

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The purposes of this research project are the elucidation of underlying mechanism of spin-charge conversion in ferromagnets and the development of ferromagnet with high conversion efficiency in order to observe the “self-induced spin torque” in a single ferromagnetic layer. We evaluated the spin orbit torque in the single ferromagnetic layer by using the harmonic Hall voltage measurement. We also observed the spin anomalous Hall effect exploiting the spin torque ferromagnetic resonance method, and successfully demonstrated the magnetization switching induced by spin anomalous Hall effect. In addition, we elucidated the spin-charge conversion mechanism in the ferromagnetic Heusler alloys. These findings and achievements will be beneficial to understand and control the self-induced spin torque.
Transport properties of nanostructured topological materials

Fujisawa Toshimasa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Tokyo Institute of Technology

2015/06/29 - 2020/03/31

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In this project, we have intensively studied transport characteristics of artificial topological-material nanostructures by using semiconductor heterostructures and low-dimensional structures. Particularly we have developed novel topological quantum phenomena that cannot be seen in bulk materials and provided design concepts for novel nanostructured devices with topological materials. Specific results include (1) dynamics and non-equilibrium phenomena in chiral edge states in quantum Hall systems, (2) controlling helical edge states in quantum spin Hall systems, (3) spin transport based on spin-orbit locking and Weyl semimetals, (4) elemental technologies for controlling fractional charges in fractional quantum Hall systems, and (5) experimental and theoretical works for detecting Majorana quasiparticles. These results would provide physical understandings of topological quasiparticles and applications of topological-material nanostructures.
Realization of spin functionalities based on persistent spin helix state in semiconductors Competitive

Kohda Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2015/04/01 - 2020/03/31

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We investigated the novel spin phenomena and functionalities based on persistent spin helix state in semiconductor heterostructures. We have achieved the discovery of novel spin manipulation method based on spin-momentum locking, the long spin relaxation time by optically excited potential dimple, long spin transport by drift bias under persistent spin helix state and stabilization of spin wave by using lateral confinement in semiconductor two dimensional electron gas. Towards device application and development of persistent spin helix state in new materials, we further investigated the interface-induced spin orbit interaction in atomic layer materials and epitaxial non-magnetic metal films.
Spin-orbit Engineering

NITTA Junsaku, KOHDA Makoto, TEZUKA Nobuki, SHIOGAI Junichi, SANADA Haruki, KUNIHASHI Yoji, GOTOH Hideki, SOGAWA Tetsuomi, TANAKA Yusuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

Category: Grant-in-Aid for Specially Promoted Research

Institution: Tohoku University

2015 - 2020
ヘリカルスピントロニクスの学理構築

Offer Organization: 東北大学

System: 新領域創成のための挑戦的研究DUO

Institution: 東北大学

2019/12 -
Controlling and Inducing Magnetism with Electric Field Effects

Chiba Daichi, SEKIGUCHI Koji, ONO Teruo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

Category: Grant-in-Aid for Scientific Research (S)

Institution: The University of Tokyo

2013/05/31 - 2018/03/31

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Improving a magnetic storage technique is crucial for the coming information explosion era. In particular, an efficient manipulation of magnetization is the key to further reduce energy consumption of magnetic storage devices. In this research project, we have mainly focused on improving the way of an electric-field-induced magnetization manipulation and understanding its fundamental mechanism. Various experiments have unveiled the underlying mechanism of the electric field effect on magnetism in ferromagnetic and non-magnetic metals. Using the knowledge from these experiments, we have demonstrated the efficient electric-field-induced magnetization switching and the electrical information writing in a magnetic race track memory. As well as using an electric field, we have investigated other ways for manipulating magnetization and opened up an novel application of magnetic nano-films in addition to the magnetic storage application.
Ultrafast spin manipulation using the intense THz pulse

Morita Ken, KOHDA Makoto, NAKAJIMA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Chiba University

2014/04/01 - 2017/03/31

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Using the spin precession around the effective magnetic field induced by the spin-orbit interaction in semiconductors, is effective method to manipulate the electron spins without under the external magnetic fields. Recently, the THz pulse which amplitude exceeds 1 MV/cm has been successfully generated by using the tilted-pulse front-phase technique. When such an intense THz pulse is irradiated, the electron spins drift and feel strong effective magnetic field which result in the high speed spin rotation. We setup the optical systems of tilted-pulse front-phase technique for THz pulse generation and time-resolved Kerr rotation for spin dynamics measurement. We measured the spin dynamics under the irradiation of the THz pulse which has the electric field amplitude of 600 V/cm. However, we could not observe the drift motion and the rotation of the spins in our measurements. Our Monte-Carlo simulation shows that the field amplitude is too small to drift the spins at the room temperature.
On-chip manipulation of the coupling between a THz light source and a photon detector using quantum transport channels

Ikushima Kenji, KOBAYASHI Takashi, VIDELIER Hadley, ITO Atsushi, OKANO Shun

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tokyo University of Agriculture and Technology

2013/04/01 - 2017/03/31

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The purpose of this work is to realize the on-chip THz system in which the generation, transmission and detection are electrically driven in a single chip. The platform is in a two-dimensional electron system in strong magnetic field. Using a point-source from quantum Hall edge states and a quantum-dot single photon detector, the following results are obtained. (1) Single photon detection of THz waves propagating a coplanar waveguide (or resonating in a coplanar split ring) is demonstrated. (2) Using these on-chip THz systems, it is found that photon emission due to electrons injected by edge channels requires the spin-flip Landau-level transition, probably through the spin-orbit interaction due to edge drift motion. These results provide the feasibility of on-chip THz photon manipulation and imply the possible applications of photon manipulation due to spin-polarized quantum transport channels.
垂直磁化材料を用いたゲート電界磁化制御型スピンMOSFETの構築 Competitive

System: New Energy Technology Research and Development

2011/10 - 2015/10
Spin transport in an organic semiconductor single crystal by using micro spin-pumping

SEKI Takeshi, ONO Shimpei, KOHDA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04/01 - 2015/03/31

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The purpose of this research project is to develop spintronic devices utilizing organic semiconductor single crystals basically consisting of carbon which is an ubiquitous element. We used a micro spin-pumping method as a technique to inject spins into organic semiconductors and nonmagnetic metals, and the injection, the transport and the detection of spins were examined experimentally. We successfully controlled the magnetization dynamics in the microfabricated magnetic element, and injected spins into the Cu nanowire due to the micro spin-pumping. We also observed the change in the spin accumulation in Cu by attaching the Pt wire with Cu. In addition, we fabricated the device with the junction of Rubrene single crystal and ferromagnetic electrode, and evaluated the magnetization dynamics under the gate voltage application.
Exploration of new spin functionalities in magnetic/non-magnetic heterostructures

NITTA Junsaku, KOHDA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04/01 - 2015/03/31

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To clarify the mechnisim of magnetization reversal, we made Pt/Co/Pt structures with inversion symmetry and and AlO/Co/Pt structures with inversion asymmetry. In Pt/Co/Pt structures, we succeeded in evaluating conversion relation between current and magnetic field induced by spin Hall effect. We found that both Rashba and spin Hall effects coexist in AlO/Co/Pt structures. The Rashba effect is dominant with increasing Co thickness while the spin Hall effect is getting larger with increasing Pt thickness.
Developments of organic spintronic devices

ONO Shimpei, SEKI Takeshi, KOHDA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Central Research Institute of Electric Power Industry

2013/04/01 - 2015/03/31

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Spintronics, which utilize electron and charges, attract much attentions which enable us to operate semiconductor-based electronics with low-energy consumption. In this project we tried to develop spintronic devices made by organic semiconductors. The way to inject spins into organic semiconductors are as follows: 1) Spin pumping-induced spin injection into organic semiconductors, 2) Light-emitting diode structure with ferromagnetic contacts. We observed that there are signatures of spins which is induced to organic semiconductors.
Magnetization reversal by controlling a perpendicular magnetic layer / semiconductor interface

KOHDA Makoto, NITTA Junsaku

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04/01 - 2015/03/31

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Spin orbit interaction in Pt/Co/AlO is widely debated throughout reported literature with causes varying between the Rashba and spin Hall effect and measured strengths varying up to 2 orders of magnitude. To resolve the inconsistency, films of varying interlayer thicknesses as well as material compositions were fabricated, measured and corresponded to the associated spin orbit interaction origin based on theory. We confirmed the control of spin orbit torque by changing the thickness of Pt and Co layers. The measurement method of the present experiment addresses the errors associated with previous methods due to heating.
Spin quantum information transfer using dynamic quantum dots

SANADA Haruki, KUNIHASHI Yoji, GOTOH Hideki, ONOMITSU Koji, KOHDA Makoto, NITTA Junsaku, SANTOS Paulo V., SOGAWA Tetsuomi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

Category: Grant-in-Aid for Young Scientists (A)

Institution: NTT Basic Research Laboratories

2012/04/01 - 2015/03/31

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Electron spins are possible candidates as qubits for solid state quantum computer. The most promising approach for spin control is based on electron spin resonance (ESR). However, ESR requires external magnetic fields, which are generated in spaces that greatly exceed individual electrons, thus making these complex and inefficient techniques unsuitable for device applications. We carried out spin transport experiments using trajectly-controlled "dynamic dots", which are realized by applying surface acoustic waves on semiconductor quantum wells. We observed the spin behavior of ESR even in the absence of external magnetic fields. This phenomenon allows us to manipulate spins in any three-dimensional direction by designing appropriate channel structures.
Electrical spin generation and its manipulation in semiconductor nanostructures

KOHDA Makoto, NITTA Junsaku

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

Category: Grant-in-Aid for Young Scientists (A)

Institution: Tohoku University

2012/04/01 - 2015/03/31

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We demonstrated electrical spin injection with InGaAs based quantum point contact which holds strong spin orbit interaction. By applying side gates in the quantum point contact, we can induce not only one dimensional channel for electrons but also spatial change of effective magnetic fields induced by spin orbit interaction. This acts to spin dependent force for electron spin resulting in the spatial separation of up spin and down spin. We observed 0.5(2e^2/h) conductance plateau and, by applying external magnetic fields, we confirmed the spin polarized direction and spin polarization.
Creation of spin devices based on relativistic effects

NITTA Junsaku, TEZUKA Nobuki, KOHDA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2010/04/01 - 2015/03/31

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Spatially local and high speed manipulations of electron spins are difficult with a magnetic field. Electron spins moving in an electric field feel a magnetic field because of a relativistic spin-orbit interaction. We succeeded in electrical spin generation, manipulation, and detection by using spin-orbit interaction at semiconductor heterostructures without using a magnetic field. Furthermore, we established a novel concept to determine the strength of two different spin-orbit interactions and realized a gate-controlled persistent spin helix state where the spin relaxation is suppressed. These results pave a way for future low power-consumption spintronic devices.
半導体ヘテロ界面のスピン軌道相互作用制御による電気的スピン生成・検出機能の創製 Competitive

System: JST Basic Research Programs (Precursory Research for Embryonic Science and Technology :PRESTO)

2008/10 - 2012/03
Current induced magnonic crystal

NITTA Junsaku, KOHDA Makoto, BAI Lihui

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2011 - 2012

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We have confirmed electrical generation, control and detection of spin wave in NiFe strip lines from a spin rectification method. It is found that a Heusler alloy has a lower damping coefficient than that of NiFe. Spin wave coupling can be controlled by a periodic magnetic potential, which can be used as a tunable spin wave filter. This is a basis of magnonic crystal.
Chirality control of ferromagnetic ring memoery by magnetostatic interaction

KOHDA Makoto, NITTA Junsaku

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2009 - 2010

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In nanosized ferromagnetic ring structures, there are two characteristic magnetic states called Onion state and Vortex state. Especially, in Vortex state, magnetic moment aligns around the ring perimeter, resulting in the suppression of the stray field from the ring edge. Magnetic moment aligns either clockwise or counter clockwise directions and plays an important role for the application of high density memory cells. We proposed the electrical detection of chiral direction (clockwise and couter clockwise directions in the Vortex state). By applying the in-plane magnetic field to be asymmetric to the ring structure, we can detect either clockwise or counter clockwise direction by detecting the magneto-resistance change.
Electrical detection and control of spin current by using spin orbit interaction

NITTA Junsaku, KOHDA Makoto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2007 - 2010

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Spin orbit interaction (SOI) plays an important role for electrical manipulation of spins. However, the direction of the effective magnetic field induced by the SOI delends on the momentum direction. Therefore, spin orientation is randomized after scattering events. This is the so-called spin relaxation. Spin relaxation is suppressed when the Rashba SOI strength is equal to that of the Dresselhaus SOI since the effective magnetic field direction becomes uniaxial. We have found that spin relaxation rate depends on the crystal orientations in InGaAs wires. This indicates that both Rashba and Dresselhaus SOIs coexist in an InGaAs/InAlAs heterostructure. The Dresselhaus SOI strength depends on the thickness of quantum well (QW). In a thinnest InGaAs QW, remarkable suppression of spin relaxation is observed by tuning the Rashba SOI through the gate voltage. This suggests the gate-controlled persistent spin helix state.
半導体量子構造による電気的電子スピン位相制御/検出技術の開拓と量子情報への応用 Competitive

System: The public participation program for the promotion of creative info-communications technology R and D

2007/06 - 2009/03
Spin based three terminal device using magnetic semiconductor/non-magnetic semiconductor hybrid structures

NITTA Junsaku, KOHDA Makoto, OHNO Yuzo

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

2006 - 2009

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We have found that spin relaxation is suppressed in narrow InGaAs wires. Furthermore, the spin relaxation length is much enhanced by controlling spin-orbit interaction through gate voltage on top of the InGaAs wires. We have confirmed that magnetic anisotropy of magnetic semiconductor GaMnAs can be artificially introduced by making its wire-width narrower. A fabricated GaMnAs double-tunnel-barrier transistor has shown a current gain (=corrector current/base current) under particular bias condition.
スピン注入による半導体スピンホール効果の電気的検出

新田淳作, 好田誠

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2007 - 2008

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面直方向スピン偏極電子の電気的スピン注入はスピン軌道相互作用を利用したスピン制御デバイスの実現に必要不可欠な基盤技術である。L10規則構造を有するFePtは高い一軸結晶磁気異方性を有し、GaAs上にMg/L10-FePtをエピタキシャル成長し、スピンバルブ構造を作製することにより電気・磁気特性を評価した。 X線回折において(002)FePt基本ピークに加えL10規則構造を示す(001)FePt超格子ピークも確認された。規則度は0.86となり、また、格子定数からL10-FePtのc軸が膜面直方向に配向していることが明らかとなった。極カー効果測定より残留磁化比は0.937と高い値が得られGaAs/MgO上に角形性の良いL10-FePt面直磁化膜が実現できた。面内スピン注入に必要なFePt電極間の保磁力差を付与するためArイオンミリングにより膜厚を制御し20nmと10nmFePtにおいて、わずかであるが保磁力差ができることを確認した。これらの結果より高残留磁化比とFePt電極間に平行/反平行磁化状態の制御を満たすハイブリッド構造を実現した。以上よりスピンバルブ素子を作製し、非局所測定によりスピン流の電気的検出を見た結果、スピン注入を示唆する非局所電圧変化を観測した。これがスピン流信号であることを確認するため今後はハンル測定を試みる。
スピンホール効果の電気的検出とスピン流による磁性体磁化反転への応用

好田誠

Offer Organization: 日本学術振興会

System: 科学研究費助成事業若手研究(B)

Category: 若手研究(B)

Institution: 東北大学

2006 - 2007

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本年度は、微小強磁性体磁化過程の評価及びスピンホール効果の電気的検出に必要な半導体におけるスピン軌道相互作用について以下の知見を得た。 (1)漏洩磁場が抑制できる強磁性体リング構造の最適化リング外径をd_0=800nmに固定し、内径をd_i=200〜600nmまで変化させた際の強磁性体Feリング配列における磁化反転過程を調べたところ、リング内径の減少に伴いOnion状態が安定となった。マイクロマグネティックシミュレーションとの比較から、d_i=600nmのリングでは磁気モーメントがリング周に沿うため漏洩磁場が抑制され、隣接リング間との静磁的相互作用が減少し、d_i=200リングよりも早くOnion状態に転移することが明らかとなった。 (2)磁性体と半導体ホール素子の組み合わせによる単一磁性体磁気特性の高感度検出単一磁性体の磁化過程を評価するため、InAlAs/InGaAs2次元電子ガスを用いたホール素子上に外形800nm、内径600nmのFe/Au/Fe3層リング構造を作製し、局所ホール効果による磁化過程の電気的検出を行った。その結果、上下強磁性体Feリングの磁化過程を独立して検出可能となり、中間のAu膜厚増大に伴う、上下Feリングの静磁的相互作用の変化を観測することに成功した。 (3)Fe/MgO/GaAsトンネル接合の最適化前年度のFePt/MgO/LED構造による電気的スピン注入の光学的検出では1%の偏光率が得られた。断面TEMによる接合界面の評価により、MgO/GaAs界面にアモルファス層の生成が確認されスピン注入効率低下の原因と考えられる。そこで、GaAs/MgO界面での化合物生成を抑制するため室温によるMgO成膜を試み、FeptのMgO膜厚に対する磁気特性及びトンネル接合の電気特性を評価した。 MgO膜厚を3nm-7nmまで変化させFePtを成膜したところ、すべてMgO膜厚において面直磁気異方性を有するFePt薄膜が実現できた。I-V特性からMgO3nmではFePt/GaAsショットキバリアを介したトンネル電流、5,7nmではMgOバリアを介したトンネル電流が支配的であることを明らかにした。
電気的なスピン偏極電子注入によるスピン電界効果トランジスタの実現

好田誠

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2003 - 2005

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【GaMnAs/n^+-GaAsトンネル接合発光素子の三端子制御による高効率スピン注入とスピン注入特性理解】スピン注入層となる(Ga,Mn)As/n^+-GaAsトンネル接合と検出層となる発光ダイオード(LED)構造の間にオーミック電極を形成することにより、トンネル接合とLED構造を独立に制御し半導体へのスピン注入効率とその特性理解について評価した。LEDのバイアス電圧(V_<LED>)を固定し、偏光率のトンネル接合バイアス(V_<Esaki>)依存性を調べたところ、フラットバンド状態となるV_<LED>=1.40Vでは、V_<Esaki>増大に伴い偏光率は上昇し極大値を迎えた後に減少する。しかしV_<LED>を減少させると前述の依存性に加え、偏光率はピーク構造を示し高い値を示した。ピーク偏光率時のV_<Esaki>変化とLEDのバイアス状態の対応から、高いエネルギの電子がトンネル接合から活性層へ注入されるに従い偏光率が増大することが分かった。またピーク偏光率の状態は、(Ga,Mn)Asのフェルミエネルギ近傍のスピン偏極電子がバリスティックに活性層へ注入されることを実験的に初めて示した。半導体中の電子スピン偏極率は85.6%と計算され、(Ga,Mn)As自体のスピン分極率を反映する高い値であることを示した。【電気的スピン注入による半導体中のスピン蓄積検出】 (Ga,Mn)As/n^+-GaAsトンネル接合を介して注入され、非磁性半導体に蓄積されるスピン偏極を比局所スピンバルブ測定法を用いて電気的な検出を試みた。試料はチャネル幅7.9〓mの(Ga,Mn)As 20nm/n^+-GaAs 15nm(Si:1×10^<19>cm_<-3>)/n-GaAs 500nm(Si:1×10^<16>cm^<-3>)である。スピン注入層と検出層との距離が10□mおよび20〓mの試料についてスピン偏極電位差ΔVの磁場依存性を調べたところ、スピン蓄積に起因する信号変化は雑音レベル(7μV)以下で観測されなかった。一方、接合部のトンネル抵抗を考慮した理論モデルによりn-GaAsチャネル層に蓄積されるスピン偏極を計算した結果、チャネル長10〓mにおけるΔVは1.9μVと測定系の雑音レベルと同等であった。以上の結果から、(Ga,Mn)As/n^+-GaAsトンネル接合による電気的なスピン偏極電位差の検出について定量的な検討と、実際の素子構造を反映した理論モデルの改善が必要であることが明らかとなった。

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Teaching Experience 3

固体電子論
固体物性　東北大学
電子材料学　東北大学

Social Activities 1

単結晶プラチナ薄膜のスピン伝導機構解明～省電力電界駆動スピントロニクスの展開への期待～

2016/06/30 -

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知能デバイス材料学専攻柳淀春博士後期課程学生、好田誠准教授、新田淳作教授らの研究グループは、スピン軌道相互作用※1の強い金属プラチナ（Pt）の単結晶薄膜を作製し、量子干渉効果※2の膜厚依存性を詳細に解析することによりスピン伝導機構の解明に成功しました。

Media Coverage 6

長寿命なスピン波発見ー超省電力デバイス実現へー

日刊工業新聞　科学技術・大学

2020/08/06

Type: Newspaper, magazine
半導体における長寿命電子スピン波の発見 -「スピン波」が拓く超省電力・量子情報デバイスへの期待 -

電波新聞　先端技術(9面)

2020/06/17

Type: Newspaper, magazine
強磁性体や外部磁場を用いずに電子のスピンを揃えることに世界で初めて成功 ―半導体中でシュテルン‐ゲルラッハのスピン分離実験を実現―

2012/09/25

Type: Newspaper, magazine

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1.強磁性体や外部磁場を用いずにスピンの揃った電流を生成し、偏極率70%を実現 2.半導体中でシュテルン－ゲルラッハのスピン分離実験を実現 3.電気的スピン制御・検出との融合により次世代省電力・高速半導体素子が可能本研究成果は、2012年9月25日(日本時間26日)に、英国科学誌『Nature Communications(ネーチャーコミュニケーションズ)』(オンライン誌)に掲載されます。
電子スピン永久旋回状態の電気的制御に成功 ―次世代省電力・高速半導体デバイス実現へ期待―

2012/09/07

Type: Other

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1.半導体中で電子スピンの向きを長時間保持できる状態を実現 2.トランジスタ構造を用いた電気的制御によりスピン永久旋回状態を実現 3.次世代省電力・高速半導体トランジスタにおけるスピン制御の新手法として期待
半導体中のスピン寿命の増大に成功

2009/06/05

Type: Newspaper, magazine
Presenting The Brightest of The Latest in ALD

2009/06

Type: Newspaper, magazine

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Other 16

排熱を電気に変換する新規熱電素子の創製

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垂直磁化材料を用いた新規熱電素子とスピンゼーベック効果への応用を目指す。
磁性体から非磁性体中への高効率スピン流注入とスピン流可視化解析技術開発

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高効率スピン注入とスピンゼーベック効果の効率化を図る
垂直磁化材料を用いたゲート電界磁化制御型スピンMOSFETの構築

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垂直磁化材料を用いたゲート電界磁化制御型スピンMOSFETの構築
強磁性金属/半導体ハイブリッドデバイスによるスピントランジスタの研究

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強磁性金属/半導体ハイブリッドデバイスによるスピントランジスタの研究
半導体を用いたスピンフィルターの構築

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半導体を用いたスピンフィルターの構築
垂直磁化強磁性体と半導体発光素子を組み合わせた環境調和型光メモリ素子に関する研究

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垂直磁化強磁性体と半導体発光素子を組み合わせた環境調和型光メモリ素子に関する研究
強磁性体・半導体複合構造による環境調和型光情報読み出し技術に関する研究

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本研究は、情報処理(読み出し)と情報記録を一つのデバイスで併せ持つ強磁性体・半導体複合型光情報読み出し装置の開発を目指す。
先端スピントロニクス材料と伝導現象

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半導体においてスピン自由度を活用した新たな機能を有するデバイス創製し、かつ既存の半導体技術と融合するためには、半導体横型素子におけるスピンダイナミクスの解明が重要となる。研究期間内でスピン流の高効率生成法と高感度検出法の確立と、強磁性半導体と組み合わせた半導体横型素子におけるスピンダイナミクスを明らかにする。
高密度・省エネルギー化に向けた強磁性体リングメモリに関する研究

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今日の高度情報通信社会を支える半導体・磁性体デバイスは高密度集積化が進められる一方で、消費電力が増大し環境負荷を生み出す要因となっていた。そのため、たとえ高密度集積化が実現されたとしても、環境問題解決に向けた省エネルギー技術という観点からは必ずしも望ましいものではなかった。そこで本研究は、環境負荷低減・クリーンエネルギー実現に向けた超省電力・高密度磁気メモリ開発を目指す。
半導体微細加工による次元制御を用いた電気的スピン制御技術の創製

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強磁性再選構造を用いたスピン緩和時間増大および電気的スピン制御を目指す
ヘテロ界面のスピン軌道相互作用制御による電気的スピン生成・検出機能の創製

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本研究のねらいは、磁場や強磁性体、円偏光を必要としない半導体のみによる電気的なスピン生成・スピン制御・スピン検出法を構築することにある。その実現手法として、異種半導体へテロ界面のバンド不連続に起因した電界によるスピン軌道相互作用を活用する。
半導体量子構造への電気的スピン注入および電気的スピン制御

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半導体への電気的スピン注入技術およびスピン軌道相互作用を利用した電気的スピン制御技術の確立とその融合を目指す
半導体微細加工による次元制御を用いたスピン軌道相互作用の評価

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半導体2次元電子ガス構造に対して微細加工技術を施すことにより量子細線や量子リングを作製し、微細構造におけるスピン軌道相互作用の電気的制御技術の確立と評価技術の構築を図る。
電気的スピン注入によるスピンホール効果の電気的検出と制御

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強磁性金属から非磁性半導体への電気的スピン注入を行うことにより、2次元電子ガスにおけるスピンホール効果の電気的検出を計る。
半導体量子構造による電気的電子スピン位相制御/検出技術の開拓と量子情報端末への応用

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半導体2次元電子ガスにおけるスピン軌道相互作用の電気的制御技術を基に、電気的スピン注入と組み合わせることにより電子スピンの電気的位相制御の確立と量子情報端末に向けた基盤技術の構築を図る。
強磁性体/半導体ハイブリッド構造によるスピン機能デバイスの構築

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強磁性体と半導体を組み合わせることにより、電気的スピン注入及び検出技術の基盤構築を図る。また電気的スピン制御に向けスピン軌道相互作用の電界制御を試みる。

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