反強磁性ヘテロ構造におけるスピン軌道トルク磁化反転の空間・元素・時間分解観察

• Project/Area Number: 18KK0143
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 29:Applied condensed matter physics and related fields
• Research Institution: Tohoku University
• Principal Investigator: 深見 俊輔 東北大学, 電気通信研究所, 准教授 (60704492)
• Co-Investigator(Kenkyū-buntansha): KURENKOV ALEKSANDR 東北大学, 先端スピントロニクス研究開発センター, 学術研究員 (80830645) ; DUTTAGUPTA SAMIK 東北大学, 先端スピントロニクス研究開発センター, 助教 (30807657) ; LLANDRO Justin 東北大学, 電気通信研究所, 助教 (90784140)
• Project Period (FY): 2018-10-09 – 2020-03-31
• Project Status: Discontinued (Fiscal Year 2019)
• Budget Amount: ¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000); Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2019: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000); Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: スピントロニクス / 反強磁性 / スピン軌道トルク / 磁区観察 / 放射光

Outline of Annual Research Achievements

本研究課題は2018年10月に採択されて研究を開始し、当初は2021年3月に完了予定であったが、研究代表者が申請していた別の研究課題が2019年6月に基盤研究(S)で採択されたことを受け、廃止することとなった。
約9か月の研究期間内において、2018年11月には英国に渡航し、放射光施設Diamond Light Sourceにおいて、共同研究相手であるスイス連邦工科大学のPietro Gambardella教授のグループと共同でX線磁気円二色性および磁気線二色性を用いた顕微鏡観察の実験を行った。研究代表者の深見および分担者のKurenkov、同じく分担者のDuttaGuptaの作製した磁性ヘテロ積層膜からなる微細素子の反強磁性層のネールベクトルおよび強磁性層の磁化の電流に対する応答を観察し、これまでに電気的な測定で得られていた結果の理解につながる有用な知見が得られた。その後、得られた結果を画像処理などから解析するとともにマイクロマグネティックシミュレーションなどを行い、反強磁性／強磁性ヘテロ構造、及び反強磁性／非磁性ヘテロ構造においてスピン軌道トルクによって誘起されるドメインのダイナミクスに関する統一的な理解が得られた。

Research Products

• [Int'l Joint Research] スイス連邦工科大学(スイス)
• [Int'l Joint Research] Diamond Light Source(英国)
• [Int'l Joint Research] ニュー・サウス・ウェールズ大学(オーストラリア)
• [Journal Article] Stack structure and temperature dependence of spin-orbit torques in heterostructures with antiferromagnetic PtMn (2019)
  • Author(s): Itoh Ryuichi、Takeuchi Yutaro、DuttaGupta Samik、Fukami Shunsuke、Ohno Hideo
  • Journal Title: Applied Physics Letters Volume: 115 Issue: 24 Pages: 242404-242404
  • DOI: 10.1063/1.5129829
  • Peer Reviewed
• [Journal Article] Formation and current-induced motion of synthetic antiferromagnetic skyrmion bubbles (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 5153-5153
  • DOI: 10.1038/s41467-019-13182-6
  • Peer Reviewed / Open Access
• [Journal Article] Artificial Neuron and Synapse Realized in an Antiferromagnet/Ferromagnet Heterostructure Using Dynamics of Spin?Orbit Torque Switching (2019)
  • Author(s): Kurenkov Aleksandr、DuttaGupta Samik、Zhang Chaoliang、Fukami Shunsuke、Horio Yoshihiko、Ohno Hideo
  • Journal Title: Advanced Materials Volume: 31 Issue: 23 Pages: 1900636-1900636
  • DOI: 10.1002/adma.201900636
  • Peer Reviewed / Open Access
• [Journal Article] Reversal of domain wall chirality with ferromagnet thickness in W/(Co)FeB/MgO systems (2019)
  • Author(s): Dohi Takaaki、DuttaGupta Samik、Fukami Shunsuke、Ohno Hideo
  • Journal Title: Applied Physics Letters Volume: 114 Issue: 4 Pages: 042405-042405
  • DOI: 10.1063/1.5084095
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Antiferromagnet layer thickness dependence of spin-orbit torque in PtMn/CoFeB structures (2019)
  • Author(s): R. Itoh, Y. Takeuchi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: 16th RIEC International Workshop on Spintronics and 8th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
• [Presentation] Ferromagnet thickness dependence of effective Dzyaloshinskii-Moriya field in W/(Co)FeB/MgO systems (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: 16th RIEC International Workshop on Spintronics and 8th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
• [Presentation] Angular dependence of longitudinal and transverse magnetoresistance in antiferromagnet/nonmagnet metallic heterostructures (2019)
  • Author(s): S. DuttaGupta, R. Itoh, S. Fukami, and H. Ohno
  • Organizer: 16th RIEC International Workshop on Spintronics and 8th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
• [Presentation] Sign reversal of Dzyaloshinskii-Moriya effective field with ferromagnetic layer thickness in W/(Co)FeB/MgO heterostructures (2019)
  • Author(s): T. Dohi, S. Duttagupta, Y. Takeuchi, S. Fukami, and H. Ohno
  • Organizer: 2019 Joint MMM-Intermag Conference
• [Presentation] スピントロニクス素子の新機能創出 (2019)
  • Author(s): 深見俊輔
  • Organizer: 東北大学電気通信研究所 共同プロジェクト研究会 「新規固体デバイス・回路を用いた脳型コンピューティングに関する研究」
  • Invited
• [Presentation] 不揮発性スピントロニクス素子技術 ー 大容量化、高速化、多機能化に向けた取り組み (2019)
  • Author(s): 深見俊輔、大野英男
  • Organizer: 日本学術振興会「先端ナノデバイス・材料テクノロジー第151委員会」 平成３０年度第６回研究会
  • Invited
• [Presentation] Spin Hall Magnetoresistance in antiferromagnet/non-magnet metallic heterostructures (2019)
  • Author(s): S. DuttaGupta, R. Itoh, S. Fukami and H. Ohno
  • Organizer: The 2nd Symposium for World Leading Research Centers
• [Presentation] Observation of domains during spin-orbit torque induced memristive switching in antiferromagnet/ferromagnet heterostructures (2019)
  • Author(s): A. Kurenkov, M. Baumgartner, G. Sala, G. Krishnaswamy, F. Maccherozzi, S. Fukami, P. Gambardella, and H. Ohno
  • Organizer: The 2nd Symposium for World Leading Research Centers
  • Int'l Joint Research
• [Presentation] Spin orbitronics for high-speed memory and artificial neural network (2019)
  • Author(s): S. Fukami and H. Ohno
  • Organizer: 2nd Tohoku/SG-SPIN Workshop in Spintronics
  • Invited
• [Presentation] Sign change of effective Dyaloshinskii-Moriya field with varying ferromagnet thickness in W/(Co)FeB/MgO systems (2019)
  • Author(s): T. Dohi, S. Duttagupta, S. Fukami, and H. Ohno
  • Organizer: 2nd Tohoku/SG-SPIN Workshop in Spintronics
• [Presentation] 不揮発性スピントロニクス素子とその応用 (2019)
  • Author(s): 深見俊輔
  • Organizer: 東北大学電気通信研究所－早稲田大学ナノ・ライフ創新研究機構 共同プロジェクト研究(ナノエレクトロニクスに関する連携研究) 平成30 年度研究会
  • Invited
• [Presentation] Spintronic Devices for Neural Networks (2019)
  • Author(s): S. Fukami
  • Organizer: APS March Meeting 2019
  • Invited
• [Presentation] Ferromagnetic layer thickness dependent domain wall chirality and sign of effective Dzyaloshinskii-Moriya field in W/(Co)FeB/MgO systems (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] Temperature dependence of spin-orbit torques in an antiferromagnet/ferromagnet heterostructure (2019)
  • Author(s): R. Itoh, Y. Takeuchi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] Observation of memristive domain patterns during spin-orbit torque switching in antiferromagnet/ferromagnet heterostructures (2019)
  • Author(s): A. Kurenkov, M. Baumgartner, G. Sala, G. Krishnaswamy, F. Maccherozzi, S. Fukami, P. Gambardella and H. Ohno
  • Organizer: 第66回応用物理学会春季学術講演会
  • Int'l Joint Research
• [Presentation] Artificial neural network using analog/binary spintronic devices (2019)
  • Author(s): S. Fukami and H. Ohno
  • Organizer: “Bits&Brains”: Brain-inspired materials and architectures for low energy information technology, a KNAW-Radboud University symposium
  • Invited
• [Presentation] Spin Hall Magnetoresistance in antiferromagnet/nonmagnet metallic structures (2019)
  • Author(s): S. DuttaGupta, R. Itoh, A. Kurenkov, S. Fukami, and H. Ohno
  • Organizer: York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”
• [Presentation] Antiferromagnet/ferromagnet heterostructures for artificial neurons and synapses (2019)
  • Author(s): A. Kurenkov, S. DuttaGupta, C. Zhang, S. Fukami, Y. Horio, and H. Ohno
  • Organizer: York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”
• [Presentation] Chirality transition in Dzyaloshinskii-Moriya interaction and domain wall with varying ferromagnet thickness in heavy-metal/ferromagnet heterostructures (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: Tenth International School and Conference on Spintronics and Quantum Information Technology (SpintechX)
• [Presentation] Spin-orbit torque and neural network (2019)
  • Author(s): S. Fukami
  • Organizer: 2019 International Conference on Solid-State Devices and Materials (SSDM 2019)
  • Invited
• [Presentation] Spin-orbit torque switching for spiking neural networks (2019)
  • Author(s): S. Fukami and H. Ohno
  • Organizer: Purdue-Tohoku Spintronics Workshop II
  • Invited
• [Presentation] Dzyaloshinskii-Moriya interaction and domain wall chirality in W/(Co)FeB/MgO systems (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami and H. Ohno
  • Organizer: Purdue-Tohoku Spintronics Workshop II
• [Presentation] Spin-orbit torque in nonmagnet/ferromagnet systems (2019)
  • Author(s): S. Fukami
  • Organizer: Workshop Spintronic Tohoku-Mainz Lorraine 2019
  • Invited
• [Presentation] スピントロニクス素子を用いた人工ニューラルネットワーク (2019)
  • Author(s): 深見俊輔
  • Organizer: 第80回応用物理学会秋季学術講演会
  • Invited
• [Presentation] Composition dependence of spin-orbit torque in Pt1-xMnx/CoFeB heterostructures (2019)
  • Author(s): V. Zoysa, R. Itoh, Y. Takeuchi, S. DuttaGupta, S. Fukami, and H. Ohno
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Spin-orbit torque induced switching of antiferromagnet/non-magnet metallic structure (2019)
  • Author(s): S. DuttaGupta, A. Kurenkov, O. Tretiakov, G. Krishnaswamy, G. Sala, V. Krizakova, F. Maccherozzi, S. Dhesi, P. Gambardella, S. Fukami, H. Ohno
  • Organizer: 第80回応用物理学会秋季学術講演会
  • Int'l Joint Research
• [Presentation] Antiferromagnet/Ferromagnet Heterostructures for Artificial Neurons and Synapses (2019)
  • Author(s): A. Kurenkov, S. DuttaGupta, C. Zhang, S. Fukami, Y. Horio, H. Ohno
  • Organizer: 第80回応用物理学会秋季学術講演会
• [Presentation] Artificial Neural Networks with Spintronics (2019)
  • Author(s): S. Fukami, W. A. Borders, A. Kurenkov, and H. Ohno
  • Organizer: 第43回日本磁気学会学術講演会
  • Invited
• [Presentation] Multi-domain memristive magnetization switching in antiferromagnet/ferromagnet heterostructures (2019)
  • Author(s): G. Krishnaswamy, A. Kurenkov, G. Sala, M. Baumgartner, V. Krizakova, F. Maccherozzi, S. Dhesi, S. Fukami, H. Ohno, and P. Gambardella
  • Organizer: SPICE Workshop on Antiferromagnetic Spintronics: from topology to neuromorphic computing
  • Int'l Joint Research
• [Presentation] Neuromorphic Computing with Spintronics (2019)
  • Author(s): S. Fukami and H. Ohno
  • Organizer: SPICE Workshop on Antiferromagnetic Spintronics: from topology to neuromorphic computing
  • Invited
• [Presentation] Antiferromagnet/ferromagnet heterostructures as synapses and neurons (2019)
  • Author(s): A. Kurenkov, S. DuttaGupta, C. Zhang, S. Fukami, Y. Horio and H. Ohno
  • Organizer: SPICE Workshop on Antiferromagnetic Spintronics: from topology to neuromorphic computing
  • Invited
• [Presentation] Metallic Antiferromagnets for spintronics: Reading and writing (2019)
  • Author(s): S. DuttaGupta, A. Kurenkov, R. Itoh, O. A. Tretiakov, G. Krishnaswamy, G. Sala, V. Krizakova, F. Maccherozzi, S. S. Dhesi, P. Gambardella, S. Fukami, and H. Ohno
  • Organizer: INTERNATIONAL WORKSHOP SPINTRONICS 2019 (Spin Peru)
  • Int'l Joint Research / Invited
• [Presentation] スピントロニクス素子を用いた新概念コンピューティング (2019)
  • Author(s): 深見俊輔、大野英男
  • Organizer: リザバーコンピューティングワークショップ ～基礎から最前線まで～
  • Invited
• [Presentation] Uniform artificial synapse and neuron based on spintronic devices (2019)
  • Author(s): A. Kurenkov, S. DuttaGupta, C. Zhang, S. Fukami, Y. Horio, and H. Ohno
  • Organizer: 17th RIEC International Workshop on Spintronics and 10th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
  • Invited
• [Presentation] Antiferromagnet layer thickness dependence of spin-Hall magnetoresistance in PtMn/Pt metallic heterostructures (2019)
  • Author(s): S. DuttaGupta, R. Itoh, S. Fukami and H. Ohno
  • Organizer: 17th RIEC International Workshop on Spintronics and 10th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
• [Presentation] Current-induced motion of synthetic antiferromagnetic skyrmion bubbles free from the skyrmion Hall effect (2019)
  • Author(s): T. Dohi, S. DuttaGupta, S. Fukami and H. Ohno
  • Organizer: 17th RIEC International Workshop on Spintronics and 10th JSPS Core-to-Core Workshop on “New-Concept Spintronic Devices”
• [Presentation] ブレインモルフィックコンピューティングハードウェアへのスピントロニクス素子の応用 (2019)
  • Author(s): 堀尾喜彦、深見俊輔
  • Organizer: 応用物理学会応用電子物性分科会研究例会「スピントロニクスの最前線」
  • Invited