Unveiling the spin torque induced dynamics of non-collinear antiferromagnet and its application

• Project/Area Number: 20K22409
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Tohoku University
• Principal Investigator: Takeuchi Yutaro 東北大学, 材料科学高等研究所, 特任助教 (10882136)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: スピントロニクス / 反強磁性 / スピントルク / ワイル半金属 / スピン軌道トルク / 反強磁性体 / ノンコリニア / 異常ホール効果 / ノンコリニア反強磁性体

Outline of Research at the Start

スピントロニクス分野の発展によって様々な磁気秩序を有する磁性体の電気的制御が可能になった。代表的な電気的制御の対象として強磁性体やコリニア(共線)反強磁性体があげられる。本研究では磁気構造が非共線的に秩序化したノンコリニア反強磁性体を電気的制御の対象として検討する。電気的制御のための駆動力については相対論的量子力学によって記述されるスピン起動トルクを用いる。ノンコリニア反強磁性の磁気構造にスピン起動トルクを作用させたときのダイナミクスを物理的に理解し、それに基づき従来の強磁性体・コリニア反強磁性体にない新たな機能を有したデバイスの創製を目指す。

Outline of Final Research Achievements

This study aims to investigate quantum effects and spin torque-induced dynamics in non-collinear antiferromagnetic thin films and their applications. We have clarified the mechanisms of anomalous Hall and magneto-optical Kerr effects in non-collinear antiferromagnetic Mn3Sn thin films. In addition to spin torque-induced switching of non-collinear antiferromagnet, we have succeeded in observing the chiral-spin rotation, which is a phenomenon not seen in conventional collinear magnetic systems. These phenomena can be used for memory, random number generator, oscillation device, etc. And this research has successfully paved the way for the application of novel spintronics devices based on noncolinear magnetic structures.

Academic Significance and Societal Importance of the Research Achievements

スピントロニクスでは「磁性材料の電気的制御」が最重要課題の一つである。従来、強磁性体がその制御の対象として研究されてきたが、近年、磁化がゼロの反強磁性体が注目されている。本研究ではその中でも巨大な異常ホール効果などの特異な性質を持つ、ノンコリニア反強磁性体に着目した。スピントルクによるノンコリニア反強磁性体のスピン構造の電流誘起反転を示すとともに、新規現象であるスピン構造の回転現象を発見した。加えてノンコリニア反強磁性体薄膜の種々の量子効果の生成因子も明らかにした。本研究によって、ノンコリニア反強磁性体を用いた新機能・高効率なスピントロニクスデバイスへの展開が期待される。

Research Products

• [Journal Article] Observation of domain structure in non-collinear antiferromagnetic Mn3Sn thin films by magneto-optical Kerr effect (2022)
  • Author(s): Tomohiro Uchimura, Ju-Young Yoon, Yuma Sato, Yutaro Takeuchi, Shun Kanai, Ryota Takechi, Keisuke Kishi, Yuta Yamane, Samik DuttaGupta, Jun’ichi Ieda, Hideo Ohno, and Shunsuke Fukami
  • Journal Title: Applied Physics Letters Volume: 120
  • Peer Reviewed
• [Journal Article] Chiral-spin rotation of non-collinear antiferromagnet by spin-orbit torque (2021)
  • Author(s): Takeuchi Yutaro、Yamane Yuta、Yoon Ju-Young、Itoh Ryuichi、Jinnai Butsurin、Kanai Shun、Ieda Jun’ichi、Fukami Shunsuke、Ohno Hideo
  • Journal Title: Nature Materials Volume: 20 Issue: 10 Pages: 1364-1370
  • DOI: 10.1038/s41563-021-01005-3
  • Peer Reviewed
• [Journal Article] Correlation of anomalous Hall effect with structural parameters and magnetic ordering in Mn_3+<i>x</i>Sn_1?<i>x</i> thin films (2021)
  • Author(s): Yoon Ju-Young、Takeuchi Yutaro、DuttaGupta Samik、Yamane Yuta、Kanai Shun、Ieda Jun’ichi、Ohno Hideo、Fukami Shunsuke
  • Journal Title: AIP Advances Volume: 11 Issue: 6 Pages: 065318-065318
  • DOI: 10.1063/5.0043192
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Determination of spin-orbit torque efficiency in non-collinear antiferromagnet / heavy metal heterostructures (2022)
  • Author(s): K. Kishi, Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Takechi, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 15th Joint MMM-INTERMAG Conference
  • Int'l Joint Research
• [Presentation] Sputter-deposited epitaxial non-collinear antiferromagnetic Mn3Sn thin films and spin-orbit torque driven chiral-spin rotation (2022)
  • Author(s): J. Yoon, Y. Takeuchi, Y. Yamane, R. Itoh, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: KAIST spintronics group seminar
  • Int'l Joint Research / Invited
• [Presentation] Chiral-spin rotation of non-collinear antiferromagnetic Mn3Sn by spin-orbit torque (2022)
  • Author(s): Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Itoh, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 15th Joint MMM-INTERMAG Conference
  • Int'l Joint Research / Invited
• [Presentation] Observation of non-collinear antiferromagentic domain structure in epitaxial Mn3Sn thin films (2022)
  • Author(s): T. Uchimura, J.-Y. Yoon, Y. Sato, Y. Takeuchi, S. Kanai, R. Takechi, K. Kishi, Y. Yamane, S. DuttaGupta, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 第69回応用物理学会春季学術講演会
• [Presentation] Effect of spin-orbit torque on non-collinear antiferromagnet Mn3Sn (2021)
  • Author(s): K. Kishi, Y. Takeuchi, Y. Yamame, J.-Y. Yoon, R. Takechi, B. Jinnai, S Kanai, J. Ieda, H. Ohno, S. Fukami
  • Organizer: The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics
  • Int'l Joint Research
• [Presentation] Properties and Functionalities of Non-Collinear Antiferromagnetic Mn3+x Sn1-x Thin Films (2021)
  • Author(s): J.-Y. Yoon, Y. Takeuchi, Y. Yamane, R. Itoh, S. DuttaGupta, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, S. Fukami
  • Organizer: The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics
  • Int'l Joint Research
• [Presentation] nomalous Hall Effect of Non-collinear Antiferromagnetic Weyl Semimetal Mn3+xSn1-x Thin Films: Correlation with Crystalline, Magnetic, and Electronic Structures (2021)
  • Author(s): J.-Y. Yoon, Y. Takeuchi, S. DuttaGupta, Y. Yamane, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 24th International Conference on Electronic Properties of Two-Dimensional Systems 20th International Conference on Modulated Semiconductor Structures (EP2DS-24/MSS-20) meeting
  • Int'l Joint Research
• [Presentation] Chiral-spin rotation driven by spin-orbit torque in non-collinear antiferromagnetic Mn3Sn (2021)
  • Author(s): Y.Takeuchi, Y. Yamane, J.-Y. Yoon, R. Itoh, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 1st Online RIEC International Workshop on Spintronics
  • Int'l Joint Research / Invited
• [Presentation] Electrical control of ferromagnets and non-collinear antiferromagnets by spin-orbit torque (2021)
  • Author(s): Y. Takeuchi, H. Ohno, and S. Fukami
  • Organizer: Advanced Science Research Seminar
  • Invited
• [Presentation] Spin-orbit torque induced chiral-spin rotation of non-collinear antiferromagnet (2021)
  • Author(s): Y. Takeuchi, Y. Yamane, J. Yoon, R. Itoh, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, S. Fukami
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] Spin-orbit torque efficiency in non-collinear antiferromagnet / heavy metal heterostructures (2021)
  • Author(s): K. Kishi, Y. Takeuchi, Y. Yamane, J. Yoon, R. Takechi, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, S. Fukami
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] Spin-orbit torque efficiency in non-collinear antiferromagnet / heavy metal heterostructures (2021)
  • Author(s): T. Uchimura, Y. Sato, Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Takechi, K. Kishi, S. Kanai, H. Ohno, and S. Fukami
  • Organizer: 40th Electronic Materials Symposium EMS-40
• [Presentation] Spin-orbit torque efficiency in non-collinear antiferromagnet Mn3Sn /heavy metal heterostructures (2021)
  • Author(s): K. Kishi, Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Takechi, B. Jinnai, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: 40th Electronic Materials Symposium EMS-40
• [Presentation] Anomalous Hall effect in Mn-Sn thin film - correlation with structural parameters and magnetic ordering (2021)
  • Author(s): Ju-Young Yoon, Yutaro Takeuchi, Yuta Yamane, Shun Kanai, Jun'ichi Ieda, Hideo Ohno and Shunsuke Fukami
  • Organizer: The 4th International Symposium for The Core Research Cluster for Spintronics
  • Int'l Joint Research
• [Presentation] Anomalous Hall effect in Mn-Sn thin films - correlation with crystal structure (2020)
  • Author(s): Ju-Young Yoon, Yutaro Takeuchi, Yuta Yamane, Shun Kanai, Jun'ichi Ieda, Hideo Ohno and Shunsuke Fukami
  • Organizer: 65th Annual Conference on Magnetism and Magnetic Materials (MMM 2020)
  • Int'l Joint Research
• [Patent(Industrial Property Rights)] 電子デバイス、その製造方法及びその使用方法 (2021)
  • Inventor(s): 竹内 祐太朗、深見 俊輔、山根 結太、ほか
  • Industrial Property Rights Holder: 国立大学法人 東北大学
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2021-071582
  • Filing Date: 2021