• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Exploration of angular momentum current science and its application to spin-orbit electronics

Research Project

Project/Area Number 22H04964
Research Category

Grant-in-Aid for Scientific Research (S)

Allocation TypeSingle-year Grants
Review Section Broad Section D
Research InstitutionKeio University

Principal Investigator

安藤 和也  慶應義塾大学, 理工学部(矢上), 教授 (30579610)

Co-Investigator(Kenkyū-buntansha) 三輪 真嗣  東京大学, 物性研究所, 准教授 (20609698)
浜屋 宏平  大阪大学, 大学院基礎工学研究科, 教授 (90401281)
片瀬 貴義  東京科学大学, 科学技術創成研究院, 准教授 (90648388)
Project Period (FY) 2022-04-27 – 2027-03-31
Project Status Granted (Fiscal Year 2025)
Budget Amount *help
¥197,340,000 (Direct Cost: ¥151,800,000、Indirect Cost: ¥45,540,000)
Fiscal Year 2025: ¥25,090,000 (Direct Cost: ¥19,300,000、Indirect Cost: ¥5,790,000)
Fiscal Year 2024: ¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Fiscal Year 2023: ¥39,520,000 (Direct Cost: ¥30,400,000、Indirect Cost: ¥9,120,000)
Fiscal Year 2022: ¥84,500,000 (Direct Cost: ¥65,000,000、Indirect Cost: ¥19,500,000)
Keywordsスピントロニクス
Outline of Research at the Start

物質中の電子は電荷・スピン・軌道の自由度を持ち、電流とスピン流は現代の産業・電子物理の基盤である。一方、軌道自由度に対応する「軌道流」は存在そのものが実験的には明らかではなかった。本研究は、軌道流まで包括する「角運動量流」の生成・変換・制御原理を体系化することで、従来の電子技術の延長線上にはない新たなテクノロジー体系「スピン軌道エレクトロニクス」の基盤を構築するものである。

Outline of Annual Research Achievements

電流と軌道流の相互変換が生み出す新現象として、軌道流生成現象である軌道ホール効果と軌道流・磁化の相互作用に起因して素子抵抗が変化する「軌道ホール磁気抵抗効果」の観測に成功した。スピンホール効果が初めて観測されて以降、20年近くのスピントロニクス研究において、スピンホール効果とスピン流が誘起する多彩な現象が次々と明らかになってきた。これらのスピン流誘起現象には軌道流対応物が存在することが期待され、今回の結果はこれら新現象群開拓の契機となるものである。また、スピン軌道相互作用による軌道流からスピン流への変換に関しても新たな知見が得られた。スピンホール効果による電流誘起トルクは、金属だけでなく絶縁体中の磁化の電気的制御さえ可能にすることが知られており、これを実現する代表的素子としてPt/Tm3Fe5O12構造がある。本研究では、軌道ホール効果を示すTaを組み込んだTa/Pt/Tm3Fe5O12構造を用いることで、Taの軌道ホール効果とPt中のスピン軌道相互作用による軌道流からスピン流への変換に起因する電流誘起トルクによって、Pt/Tm3Fe5O12構造と比較して電流誘起トルクの生成効率が一桁増大することを明らかにした。Ptのスピンホール効果は電流誘起トルクの最も強力な生成源であると考えられてきた。軌道流を利用することでその電流誘起トルクをさらに一桁増大させられるというこの結果は重要であると考え、上記成果を元に、研究期間後期に実施予定であった計画を前倒しして実施した。この結果、軌道ホール効果と軌道流からスピン流への変換を用いることで、磁化反転に必要な電流密度をスピン流のみによる駆動の場合と比較して一桁程度低減させられることを明らかにした。これは現在知られている中で最も高効率な絶縁体磁化の電気的制御を実現したものであり、軌道流のデバイス応用においても重要な成果が得られたといえる。

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

本研究推進の基盤となる軌道流の生成手法を確立し、軌道流の基礎的物性を早期に明らかにすることを目的とし、スピン軌道相互作用の弱い系に注目して電流誘起トルクの物質・構造依存性データを構築した。この中で、スピン流と軌道流の分離や電流誘起トルクの定量性の観点から、Tiの軌道ホール効果が効果的な軌道流・軌道トルク源であることを突き止めた。これまでの研究によって、軌道流の伝導・応答に関して基礎的知見が得られ、軌道流とスピン流の本質的違いが明らかとなった。さらに軌道流物性が顕在化する系が特定されたことで、軌道流が誘起する新現象開拓が可能となった。このように現在までの研究は計画以上に順調に進展しており、当初の目的は十分に達成されている。

Strategy for Future Research Activity

これまでの研究に引き続き、軌道流源となる物質の開拓と軌道流の基礎的性質(伝導・応答)の解明に取り組むとともに、軌道流とスピン流の変換現象に関するデータを構築する。さらに、エピタキシャル試料における軌道ホール効果・軌道ラシュバ効果による角運動量輸送に関する研究に取り組む。

Assessment Rating
Interim Assessment Comments (Rating)

A+: In light of the aim of introducing the research area into the research categories, more progress has been made in research than expected.

Report

(5 results)
  • 2024 Interim Assessment (Comments) ( PDF )
  • 2023 Annual Research Report
  • 2022 Abstract ( PDF )   Comments on the Screening Results   Annual Research Report
  • Research Products

    (51 results)

All 2024 2023 2022 Other

All Int'l Joint Research (7 results) Journal Article (19 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 19 results,  Open Access: 7 results) Presentation (23 results) (of which Int'l Joint Research: 14 results,  Invited: 2 results) Remarks (2 results)

  • [Int'l Joint Research] Wuhan University of Technology/Shenzhen Technology University(中国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Johannes Gutenberg University Mainz/Free University of Berlin(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] POSTECH(韓国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] NTNU(ノルウェー)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Wuhan University of Technology(中国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Johannes Gutenberg University Mainz(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] POSTECH(韓国)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Influence of alkali-fluoride insertion layers on the perpendicular magnetic anisotropy at the Fe/MgO interface2024

    • Author(s)
      Chen Jieyi、Sakamoto Shoya、Miwa Shinji
    • Journal Title

      Physical Review B

      Volume: 109 Issue: 6 Pages: 064413-064413

    • DOI

      10.1103/physrevb.109.064413

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Two-dimensional Rashba superconductivity in Ni/Bi bilayers evidenced by nonreciprocal transport2024

    • Author(s)
      Hayashi Hiroki、Ando Kazuya
    • Journal Title

      Applied Physics Reviews

      Volume: 11 Issue: 1 Pages: 1-8

    • DOI

      10.1063/5.0158237

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Orbital Hall magnetoresistance in Ni/Ti bilayers2023

    • Author(s)
      Hayashi Hiroki、Ando Kazuya
    • Journal Title

      Applied Physics Letters

      Volume: 123 Issue: 17 Pages: 1-5

    • DOI

      10.1063/5.0170654

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dzyaloshinskii-Moriya interaction at epitaxial ferromagnet/semiconductor interface2023

    • Author(s)
      Kimura Shuto、Yamada Michihiro、Okuno Takumi、Sawano Kentarou、Hamaya Kohei、Ando Kazuya
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 9 Pages: 094441-094441

    • DOI

      10.1103/physrevb.108.094441

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Improved hardness of semi-coherent TiN/CrN nano-multilayer coating through manipulation of structure evolution2023

    • Author(s)
      Zhang Song、Li Jiahu、Tu Rong、Ando Kazuya、Gao Tenghua
    • Journal Title

      Materials Science and Engineering: A

      Volume: 886 Pages: 145728-145728

    • DOI

      10.1016/j.msea.2023.145728

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Impact of inherent energy barrier on spin-orbit torques in magnetic-metal/semimetal heterojunctions2023

    • Author(s)
      Gao Tenghua、Qaiumzadeh Alireza、Troncoso Roberto E.、Haku Satoshi、An Hongyu、Nakayama Hiroki、Tazaki Yuya、Zhang Song、Tu Rong、Asami Akio、Brataas Arne、Ando Kazuya
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1

    • DOI

      10.1038/s41467-023-40876-9

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Isotropic Spin Hall Effect in an Epitaxial Ferromagnet2023

    • Author(s)
      Soya Nozomi、Yamada Michihiro、Hamaya Kohei、Ando Kazuya
    • Journal Title

      Physical Review Letters

      Volume: 131 Issue: 7 Pages: 076702-076702

    • DOI

      10.1103/physrevlett.131.076702

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Time-domain observation of ballistic orbital-angular-momentum currents with giant relaxation length in tungsten2023

    • Author(s)
      Seifert Tom S.、Go Dongwook、Hayashi Hiroki、Rouzegar Reza、Freimuth Frank、Ando Kazuya、Mokrousov Yuriy、Kampfrath Tobias
    • Journal Title

      Nature Nanotechnology

      Volume: 18 Issue: 10 Pages: 1132-1138

    • DOI

      10.1038/s41565-023-01470-8

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Giant Orbital-to-Spin Conversion for Efficient Current-Induced Magnetization Switching of Ferrimagnetic Insulator2023

    • Author(s)
      Li Tianhui、Liu Long、Li Xiaoguang、Zhao Xiaotian、An Hongyu、Ando Kazuya
    • Journal Title

      Nano Letters

      Volume: 23 Issue: 15 Pages: 7174-7179

    • DOI

      10.1021/acs.nanolett.3c02104

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Extrinsic anomalous Hall effect in van der Waals ferromagnet Fe5GeTe22023

    • Author(s)
      Suzuki Ryuki, Gao Tenghua, Nakayama Hiroki, Ando Kazuya
    • Journal Title

      AIP Advances

      Volume: 13 Issue: 5 Pages: 055311-055311

    • DOI

      10.1063/5.0112456

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Orbital torque originating from orbital Hall effect in Zr2023

    • Author(s)
      Fukunaga Riko、Haku Satoshi、Hayashi Hiroki、Ando Kazuya
    • Journal Title

      Physical Review Research

      Volume: 5 Issue: 2 Pages: 1-7

    • DOI

      10.1103/physrevresearch.5.023054

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nonlocal orbital torques in magnetic multilayers2023

    • Author(s)
      Taniguchi Mari、Hayashi Hiroki、Soya Nozomi、Ando Kazuya
    • Journal Title

      Applied Physics Express

      Volume: 16 Issue: 4 Pages: 043001-043001

    • DOI

      10.35848/1882-0786/accb3e

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hydride Anion Substitution Boosts Thermoelectric Performance of Polycrystalline SrTiO3 via Simultaneous Realization of Reduced Thermal Conductivity and High Electronic Conductivity2023

    • Author(s)
      He Xinyi、Nomoto Seiya、Komatsu Takehito、Katase Takayoshi、Tadano Terumasa、Kitani Suguru、Yoshida Hideto、Yamamoto Takafumi、Mizoguchi Hiroshi、Ide Keisuke、Hiramatsu Hidenori、Kawaji Hitoshi、Hosono Hideo、Kamiya Toshio
    • Journal Title

      Advanced Functional Materials

      Volume: 33 Issue: 28 Pages: 2213144-2213144

    • DOI

      10.1002/adfm.202213144

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Inverse-Perovskite Ba3BO (B = Si and Ge) as a High Performance Environmentally Benign Thermoelectric Material with Low Lattice Thermal Conductivity2023

    • Author(s)
      He Xinyi、Kimura Shigeru、Katase Takayoshi、Tadano Terumasa、Matsuishi Satoru、Minohara Makoto、Hiramatsu Hidenori、Kumigashira Hiroshi、Hosono Hideo、Kamiya Toshio
    • Journal Title

      Advanced Science

      Volume: 11 Issue: 10 Pages: 2307058-2307058

    • DOI

      10.1002/advs.202307058

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Optimizing Electromagnetic Interference Shielding of Ultrathin Nanoheterostructure Textiles through Interfacial Engineering2023

    • Author(s)
      Zhang Song、Wang Chongjie、Gao Tenghua、Hu Jinrong、Lu Pengjian、Guo Bingjian、Xu Qingfang、Liu Kai、Li Baowen、Tu Rong、Yang Meijun、Ando Kazuya
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 15 Issue: 12 Pages: 15965-15975

    • DOI

      10.1021/acsami.2c22143

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Observation of long-range orbital transport and giant orbital torque2023

    • Author(s)
      Hayashi Hiroki、Jo Daegeun、Go Dongwook、Gao Tenghua、Haku Satoshi、Mokrousov Yuriy、Lee Hyun-Woo、Ando Kazuya
    • Journal Title

      Communications Physics

      Volume: 6 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s42005-023-01139-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Magnetic anisotropy of Fe/MgO interfaces inserted with alkali halide layers2023

    • Author(s)
      Chen Jieyi、Sakamoto Shoya、Kosaki Hidetoshi、Miwa Shinji
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 9 Pages: 094420-094420

    • DOI

      10.1103/physrevb.107.094420

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Elastic and Inelastic Spin Transport in SrTiO<sub>3</sub>‐based Magnetic Heterostructure2022

    • Author(s)
      Soya Nozomi、Katase Takayoshi、Ando Kazuya
    • Journal Title

      Advanced Electronic Materials

      Volume: 8 Issue: 9 Pages: 2200232-2200232

    • DOI

      10.1002/aelm.202200232

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Origin of enhanced interfacial perpendicular magnetic anisotropy in LiF-inserted Fe/MgO interface2022

    • Author(s)
      Sakamoto Shoya、Nozaki Takayuki、Yuasa Shinji、Amemiya Kenta、Miwa Shinji
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 17 Pages: 174410-174410

    • DOI

      10.1103/physrevb.106.174410

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Current-induced orbital torques generated by Pt2024

    • Author(s)
      M. Taniguchi, H. Moriya, H. Hayashi, and K. Ando
    • Organizer
      Iwate Spintronics School
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurement of intrinsically generated transverse spin decay length in ferromagnets2024

    • Author(s)
      Y. Takeuchi and K. Ando
    • Organizer
      Iwate Spintronics School
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Gilbert damping constant of the epitaxial V/Fe/MgO multilayer2024

    • Author(s)
      J. Chen, 坂本祥哉, 甲崎秀俊, 畑尻天平, 三輪真嗣
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Two-dimensional imaging of spin and orbital magnetic moments in ultra-thin Co films by soft X-ray ptychography2024

    • Author(s)
      坂本祥哉, 竹尾陽子, 古谷登, 櫻井快, 吉永享太, 鈴木明大, 松田巌, 原田慈久, 木村隆志, 三輪真嗣
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Spin and orbital Hall torques2023

    • Author(s)
      K. Ando
    • Organizer
      20th RIEC International Workshop on Spintronics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Hf/NiO/Niにおけるスピン軌道トルクのNiO膜厚依存性2023

    • Author(s)
      白怜士, 安藤和也
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Fe5GeTe2における外因性異常ホール効果の観測2023

    • Author(s)
      鈴木隆起, 安藤和也
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 軌道流による電流誘起トルクの観測2023

    • Author(s)
      林宏樹, 安藤和也
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 強磁性体多層膜における非局所軌道トルク2023

    • Author(s)
      谷口真理, 林宏樹, 曽家希美, 安藤和也
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Zrにおける軌道ホール効果による軌道トルクの観測2023

    • Author(s)
      福永莉子, 白怜士, 林宏樹, 安藤和也
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Temperature dependence of spin-orbit torque in Ni81Fe19/AlOx/SrTiO3 heterostructure2023

    • Author(s)
      N. Soya, T. Katase, and K. Ando
    • Organizer
      Trends in Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Drastic reduction of spin-orbit torque by inserting NiO thin film2023

    • Author(s)
      S. Haku and K. Ando
    • Organizer
      Trends in Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of long-range orbital transport in ferromagnet2023

    • Author(s)
      H. Hayashi and K. Ando
    • Organizer
      Trends in Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nonlocal orbital torques in magnetic multilayers2023

    • Author(s)
      M. Taniguchi, H. Hayashi, N. Soya, and K. Ando
    • Organizer
      Trends in Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin Hall effect in the insulating regime2023

    • Author(s)
      H. Moriya, A. Musha, S. Haku, and K. Ando
    • Organizer
      Trends in Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin and orbital Hall torques2023

    • Author(s)
      K. Ando
    • Organizer
      11th International Symposium on Metallic Multilayers
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Generation and transport of spin current in SrTiO3-based magnetic heterostructure2023

    • Author(s)
      N. Soya, T. Katase, and K. Ando
    • Organizer
      Physics of Magnetism
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of alkali halide layer insertions on magnetic anisotropy at the Fe/MgO interface2023

    • Author(s)
      J. Chen, S. Sakamoto, H. Kosaki and S. Miwa
    • Organizer
      IEEE International Magnetics Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Orbital Polarization Enhanced by Electron Correlation at the Fe/MgO Interface2023

    • Author(s)
      S. Sakamoto, M. Tsujikawa, M. Shirai, K. Amemiya and S. Miwa
    • Organizer
      IEEE International Magnetics Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin Transport in Ni81Fe19/AlOx/SrTiO3 heterostructure2023

    • Author(s)
      Nozomi Soya, Takayoshi Katase, Kazuya Ando
    • Organizer
      APS March Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-orbit torque generated by rhenium2023

    • Author(s)
      Akiyo Nomura, Satoshi Haku, and Kazuya Ando
    • Organizer
      APS March Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 金属系における軌道ホールトルクの観測2023

    • Author(s)
      林宏樹, 安藤和也
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 電気化学的にエッチングされたFe/Pt二層膜におけるスピントルク強磁性共鳴2023

    • Author(s)
      鈴木隆起, 白怜士, 林宏樹, 安藤和也
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Remarks]

    • URL

      https://www.ando.appi.keio.ac.jp/

    • Related Report
      2023 Annual Research Report
  • [Remarks]

    • URL

      https://www.ando.appi.keio.ac.jp/

    • Related Report
      2022 Annual Research Report

URL: 

Published: 2022-04-28   Modified: 2025-06-20  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi