Optical detection of spin orbit effects

• Project/Area Number: 16H03853
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials
• Research Institution: The University of Tokyo
• Principal Investigator: Hayashi Masamitsu 東京大学, 大学院理学系研究科(理学部), 准教授 (70517854)
• Research Collaborator: AWANO Hiroyuki ; MITANI Seiji
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000); Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2016: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
• Keywords: 磁気光学効果 / スピン軌道相互作用 / 光検出 / スピン流 / スピン蓄積 / 光学 / 薄膜ヘテロ構造 / ヘテロ構造

Outline of Final Research Achievements

We aim to develop a system that can evaluate spin orbit effects in thin film heterostructures using optical means. Through this project, we have developed an optical setup that can resolve extremely small changes of the magneto-optical signal that enables optical detection spin orbit torque and spin accumulation. We have also demonstrated optical detection of Rashba-type electronic structure at metallic interfaces using the photogalvanic effect.

Academic Significance and Societal Importance of the Research Achievements

スピンホール角やスピントルク、ジャロシンスキー・守谷相互作用の大きさはスピン軌道効果をデバイスに応用する上での最重要パラメータであり、精緻な計測技術が必要不可欠である。本研究で構築した光解析技術により、スピン蓄積やスピン軌道トルク、界面の電子構造を精密に評価できることが明らかになった。今後はこの技術を利用して、様々な物質におけるスピン軌道効果を調査し、その起源解明に迫る。

Research Products

• [Int'l Joint Research] CSIC/University of Salamanca(Spain)
• [Journal Article] Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface (2019)
  • Author(s): Y. Ishikuro, M. Kawaguchi, N. Kato, Y. C. Lau, M. Hayashi
  • Journal Title: Phys. Rev. B Volume: 99 Issue: 13 Pages: 134421-134421
  • DOI: 10.1103/physrevb.99.134421
  • Peer Reviewed
• [Journal Article] Domain-Wall Resistance in Cofeb-Based Heterostructures with Interface Dzyaloshinskii-Moriya Interaction (2018)
  • Author(s): Y. Ishikuro, M. Kawaguchi, Y. C. Lau, Y. Nakatani, M. Hayashi
  • Journal Title: Appl. Phys. Express Volume: 11 Issue: 20 Pages: 073001-073001
  • DOI: 10.1063/1.5021510
  • NAID: 210000136280
  • Peer Reviewed
• [Journal Article] Optical Detection of Spin-Orbit Torque and Current-Induced Heating (2018)
  • Author(s): Y. Marui, M. Kawaguchi, M. Hayashi
  • Journal Title: Appl. Phys. Express Volume: 11 Issue: 9 Pages: 093001-093001
  • DOI: 10.7567/apex.11.093001
  • NAID: 210000136346
  • Peer Reviewed
• [Journal Article] Circular photogalvanic effect in Cu/Bi bilayers (2018)
  • Author(s): H. Hirose, N. Ito, M. Kawaguchi, Y. C. Lau, M. Hayashi
  • Journal Title: Appl. Phys. Lett. Volume: 113 Issue: 22 Pages: 222404-222404
  • DOI: 10.1063/1.5047418
  • Peer Reviewed
• [Journal Article] Interference induced enhancement of magneto-optical Kerr effect in ultrathin magnetic films (2018)
  • Author(s): S. Sumi, H. Awano, M. Hayashi
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 776-776
  • DOI: 10.1038/s41598-017-18794-w
  • Peer Reviewed / Open Access
• [Journal Article] Current-Induced Generation and Synchronous Motion of Highly Packed Coupled Chiral Domain Walls (2017)
  • Author(s): R. P. del Real, V. Raposo, E. Martinez, M. Hayashi
  • Journal Title: Nano Lett. Volume: 17 Issue: 3 Pages: 1814-1818
  • DOI: 10.1021/acs.nanolett.6b05132
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] スピン軌道相互作用が誘起するスピン物性 (2019)
  • Author(s): 林 将光
  • Organizer: 応用物理学会: 強的秩序とその操作に関わる研究グループ 第８回研究会
  • Invited
• [Presentation] Optically induced spin transport in semi-metal heterostructures (2019)
  • Author(s): H. Hirose, N. Ito, M. Kawaguchi, M. Hayashi
  • Organizer: 第66回応用物理学会春季学術講演会
  • Invited
• [Presentation] Giant spin-orbit torque and magnetothermal effects in sputtered BiSb/CoFeB bilayers (2019)
  • Author(s): Z. Chi, Y.-C. Lau, M. Hayashi
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] 垂直磁化膜スピン軌道トルクの光計測 (2019)
  • Author(s): 丸井幸博, 河口真志, 林将光
  • Organizer: 第74回日本物理学会年次大会
• [Presentation] 金属/半金属ヘテロ構造における界面とバルクのスピン軌道相互作用の分離 (2019)
  • Author(s): 廣瀬葉菜, 河口真志, 林将光
  • Organizer: 第74回日本物理学会年次大会
• [Presentation] Charge and heat-spin conversions in spin orbit systems (2018)
  • Author(s): M. Hayashi
  • Organizer: The 5th International Conference of Asian Union of Magnetics Societies (IcAUMS)
  • Int'l Joint Research / Invited
• [Presentation] Spin conversion effects in spin orbit heterostructures (2018)
  • Author(s): M. Hayashi
  • Organizer: SPIE Spintronics XI
  • Int'l Joint Research / Invited
• [Presentation] Spin conversion effects in spin orbit materials (2018)
  • Author(s): M. Hayashi
  • Organizer: Kavli Institute for Theoretical Sciences: Collective Spin Dynamics in Nanostructures
  • Int'l Joint Research / Invited
• [Presentation] Spin current generation in spin orbit materials (2018)
  • Author(s): M. Hayashi
  • Organizer: One-Day Symposium on Spintronic Properties of Graphene and Related 2D Materials
  • Int'l Joint Research / Invited
• [Presentation] スピン軌道材料における電流誘起トルク (2018)
  • Author(s): 林 将光
  • Organizer: 第42回日本磁気学会学術講演会
  • Invited
• [Presentation] スピン軌道ヘテロ構造におけるスピン変換現象 (2018)
  • Author(s): 河口真志, 廣瀬葉菜, 丸井幸博, 林 将光
  • Organizer: 第220回研究会/第36回光機能磁性デバイス・材料専門研究会
  • Invited
• [Presentation] スピン軌道トルク測定における磁気光学効果と熱光学効果の分離 (2018)
  • Author(s): 丸井幸博, 河口真志, 林将光
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 遷移金属/Bi 界面におけるフォトガルバニック効果 (2018)
  • Author(s): 廣瀬葉菜, 伊藤尚人, 河口真志, 林将光
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] Material dependence of interfacial spin-momentum locked bands in metallic heterostructures (2018)
  • Author(s): H. Hirose, N. Ito, M. Kawaguchi, M. Hayashi
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] スピン軌道トルクの光学測定 (2018)
  • Author(s): 丸井幸博, 河口真志, 林将光
  • Organizer: 第73回日本物理学会年次大会
• [Presentation] Spin Orbit Effects in Metallic Heterostructures (2017)
  • Author(s): M. Hayashi
  • Organizer: Gordon Research Conference -Spin Dynamics in Nanostructures
  • Int'l Joint Research / Invited
• [Presentation] Spin Hall magnetoresistance and spin orbit torques in metallic heterostructures (2017)
  • Author(s): M. Hayashi
  • Organizer: SPIE Spintronics XI
  • Int'l Joint Research / Invited
• [Presentation] Spin transport and magnetism in metallic superstructures (2017)
  • Author(s): M. Hayashi
  • Organizer: 15th RIEC International Workshop on Spintronics
  • Int'l Joint Research / Invited
• [Presentation] 薄膜へテロ構造におけるカイラル磁気構造とその制御 (2017)
  • Author(s): 林 将光
  • Organizer: 第41回日本磁気学会学術講演会
  • Invited
• [Presentation] スピン軌道効果による電流誘起磁壁生成とシフト操作 (2017)
  • Author(s): 林 将光
  • Organizer: 第３２回日本磁気学会 光機能磁性デバイス・材料専門研究会
  • Invited
• [Remarks] 研究室ホームページ
  • URL: http://qspin.phys.s.u-tokyo.ac.jp/jp/index.html
• [Remarks] Coupled chiral domain walls
  • URL: http://qspin.phys.s.u-tokyo.ac.jp/posts/news9.html