Anomalous spin electromagnetic responses in spin-orbit coupled magnets

• Project/Area Number: 17K05485
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Tohoku University
• Principal Investigator: nomura kentaro 東北大学, 金属材料研究所, 准教授 (00455776)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: トポロジカル物質 / スピントロニクス / スピン物性 / スピン軌道結合磁性体 / 物性理論 / スピン軌道相互作用 / 量子輸送現象 / 磁性 / スピンエレクトロニクス / トポロジー / メゾスコピック系

Outline of Final Research Achievements

Spin-momentum locking in Weyl semimetals correlates the orbital motion of electrons with background magnetic textures. We show here that the dynamics of a magnetic texture in a magnetic Weyl semimetal induces a pumped electric current that is free from Joule heating. This pumped current can be regarded as a Hall current induced by axial electromagnetic fields equivalent to the magnetic texture. Taking a magnetic domain wall as a test case, we demonstrate that a moving domain wall generates a pumping current corresponding to the localized charge.

Academic Significance and Societal Importance of the Research Achievements

スピントロニクスの分野では電子の電荷とスピンの自由度を制御し，電気と磁気の非自明な結合など基礎研究から，磁気メモリーや磁気センサーに応用などが行われている．本研究において我々は磁性ワイル半金属を中心とするトポロジカル物質が従来の強磁性金属に比べ，低損失でかつ堅牢なスピン電荷変換現象が起こることを理論的に示した．特に電流や電場によって磁壁が駆動する現象は従来の強磁性金属とは異なりバンドトポロジーの効果による下であること，磁気異方性の影響を受けにくい，すなわち高精度の磁気デバイスの可能性があることを明らかにした．

Research Products

• [Int'l Joint Research] テキサス大学(米国)
• [Journal Article] Magnetoelectric Response of Antiferromagnetic CrI3 Bilayers (2021)
  • Author(s): Lei Chao、Chittari Bheema L.、Nomura Kentaro、Banerjee Nepal、Jung Jeil、MacDonald Allan H.
  • Journal Title: Nano Letters Volume: 21 Issue: 5 Pages: 1948-1954
  • DOI: 10.1021/acs.nanolett.0c04242
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Critical thickness for the emergence of Weyl features in Co3Sn2S2 thin films (2021)
  • Author(s): Ikeda Junya、Fujiwara Kohei、Shiogai Junichi、Seki Takeshi、Nomura Kentaro、Takanashi Koki、Tsukazaki Atsushi
  • Journal Title: Communications Materials Volume: 2 Issue: 1 Pages: 18-18
  • DOI: 10.1038/s43246-021-00122-5
  • Peer Reviewed / Open Access
• [Journal Article] Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator (2020)
  • Author(s): Araki Yasufumi、Misawa Takahiro、Nomura Kentaro
  • Journal Title: Physical Review Research Volume: 2 Issue: 2 Pages: 023195-023195
  • DOI: 10.1103/physrevresearch.2.023195
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)2Se3 heterostructures (2020)
  • Author(s): Satake Y.、Shiogai J.、Mazur G. P.、Kimura S.、Awaji S.、Fujiwara K.、Nojima T.、Nomura K.、Souma S.、Sato T.、Dietl T.、Tsukazaki A.
  • Journal Title: Physical Review Materials Volume: 4 Issue: 4 Pages: 0442021-8
  • DOI: 10.1103/physrevmaterials.4.044202
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Weyl superconductor phases in a Weyl-semimetal/superconductor multilayer (2020)
  • Author(s): Nakai Ryota、Nomura Kentaro
  • Journal Title: Physical Review B Volume: 101 Issue: 9 Pages: 0945101-11
  • DOI: 10.1103/physrevb.101.094510
  • Peer Reviewed
• [Journal Article] Semi-quantized Spin Pumping and Spin-Orbit Torques in Topological Dirac Semimetals (2019)
  • Author(s): Misawa Takahiro、Nomura Kentaro
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 196591-8
  • DOI: 10.1038/s41598-019-55802-7
  • Peer Reviewed / Open Access
• [Journal Article] Robust magnetotransport in disordered ferromagnetic kagome layers with quantum anomalous Hall effect (2019)
  • Author(s): Kobayashi Koji、Takagaki Masaki、Nomura Kentaro
  • Journal Title: Physical Review B Volume: 100 Issue: 16
  • DOI: 10.1103/physrevb.100.161301
  • Peer Reviewed
• [Journal Article] Real-time evolution and quantized charge pumping in magnetic Weyl semimetals (2019)
  • Author(s): Misawa Takahiro、Nakai Ryota、Nomura Kentaro
  • Journal Title: Physical Review B Volume: 100 Issue: 15 Pages: 1551231-9
  • DOI: 10.1103/physrevb.100.155123
  • Peer Reviewed
• [Journal Article] Two-Orbital Effective Model for Magnetic Weyl Semimetal in Kagome-Lattice Shandite (2019)
  • Author(s): Ozawa Akihiro、Nomura Kentaro
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 12 Pages: 1237031-5
  • DOI: 10.7566/jpsj.88.123703
  • NAID: 40022096549
  • Peer Reviewed
• [Journal Article] Phase Diagram of a Magnetic Topological Nodal Semimetal: Stable Nodal Line in an Easy-Plane Ferromagnet (2019)
  • Author(s): Ominato Yuya、Yamakage Ai、Nomura Kentaro
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 11 Pages: 114701-114701
  • DOI: 10.7566/jpsj.88.114701
  • NAID: 40022062694
  • Peer Reviewed
• [Journal Article] Electrically-driven Domain Wall Motion in Quantum Anomalous Hall States (2019)
  • Author(s): Kim Sehoon、Kurebayashi Daichi、Nomura Kentaro
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 8 Pages: 083704-083704
  • DOI: 10.7566/jpsj.88.083704
  • NAID: 40021971758
  • Peer Reviewed
• [Journal Article] Theory of spin torque in Weyl semimetals with magnetic texture (2019)
  • Author(s): 1.D. Kurebayashi and K. Nomura
  • Journal Title: Sci. Rep. Volume: 9 Issue: 1 Pages: 53651-10
  • DOI: 10.1038/s41598-019-41776-z
  • Peer Reviewed / Open Access
• [Journal Article] Spin-orbit crossed susceptibility in topological Dirac semimetals (2019)
  • Author(s): Y. Ominato, S. Tatsumi, and K. Nomura
  • Journal Title: Phys. Rev. B Volume: 99 Issue: 8 Pages: 0852051-7
  • DOI: 10.1103/physrevb.99.085205
  • Peer Reviewed
• [Journal Article] Helicity-protected domain-wall magnetoresistance in ferromagnetic Weyl semimetal (2018)
  • Author(s): K. Kobayashi, Y. Ominato, and K. Nomura
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 7 Pages: 0737071-5
  • DOI: 10.7566/jpsj.87.073707
  • NAID: 210000134886
  • Peer Reviewed
• [Journal Article] Charge pumping induced by magnetic texture dynamics in Weyl semimetals (2018)
  • Author(s): Y. Araki and K. Nomura
  • Journal Title: Phys. Rev. Applied. Volume: 10 Issue: 1 Pages: 0140071-7
  • DOI: 10.1103/physrevapplied.10.014007
  • Peer Reviewed
• [Journal Article] Spin susceptibility of three-dimensional Dirac/Weyl semimetals (2018)
  • Author(s): Y. Ominato and K. Nomura
  • Journal Title: Phys. Rev. B. Volume: 97 Issue: 24 Pages: 2452071-9
  • DOI: 10.1103/physrevb.97.245207
  • Peer Reviewed
• [Journal Article] Weak localization in bilayer graphene with Li-intercalation/desorption (2018)
  • Author(s): Y. Endo, S. Ichinokura, R. Akiyama, A. Takayama, K. Sugawara, K. Nomura, T. Takahashi, S. Hasegawa,
  • Journal Title: J. Phys.: Condens. Matter Volume: 30 Issue: 30 Pages: 3057011-7
  • DOI: 10.1088/1361-648x/aaccc4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Localized charge in various configurations of magnetic domain wall in a Weyl semimetal (2018)
  • Author(s): Y. Araki, A. Yoshida, and K. Nomura
  • Journal Title: Phys. Rev. B Volume: 98 Issue: 4 Pages: 0453021-10
  • DOI: 10.1103/physrevb.98.045302
  • Peer Reviewed
• [Journal Article] Skyrmion-induced anomalous Hall conductivity on topological insulator surfaces (2017)
  • Author(s): Y. Araki and K. Nomura
  • Journal Title: Phys. Rev. B Volume: 96 Issue: 16
  • DOI: 10.1103/physrevb.96.165303
  • NAID: 130007646295
  • Peer Reviewed
• [Journal Article] Berry phase shift from 2π to π in bilayer graphene by Li-intercalation and sequential desorption (2017)
  • Author(s): R. Akiyama, Y. Takano, Y. Endo, S. Ichinokura, R. Nakanishi, K. Nomura, S. Hasegawa
  • Journal Title: Appl. Phys. Lett. Volume: 110 Issue: 23 Pages: 233106-233106
  • DOI: 10.1063/1.4984958
  • Peer Reviewed
• [Journal Article] Anomalous Hall Effect and Spontaneous Orbital Magnetization in Antiferromagnetic Weyl Metal (2017)
  • Author(s): N. Ito and K. Nomura
  • Journal Title: J. Phys. Soc. Jpn. Volume: 86 Issue: 6 Pages: 063703-063703
  • DOI: 10.7566/jpsj.86.063703
  • NAID: 40021221640
  • Peer Reviewed
• [Presentation] トポロジカル材料を用いた超低損失スピン素子の提案 (2021)
  • Author(s): 野村健太郎
  • Organizer: 日本物理学会，シンポジウム「脳神経と量子・スピン・AIの融合」
  • Invited
• [Presentation] トポロジカル半金属のスピントロニクス機能 (2021)
  • Author(s): 野村健太郎
  • Organizer: Spin Research Network of Japan 2020
  • Invited
• [Presentation] スピンとトポロジー (2021)
  • Author(s): 野村健太郎
  • Organizer: 応用物理学会「第19回スピントロニクス入門セミナー」
  • Invited
• [Presentation] Magnetism and anomalous transport in Kagome shandites (2020)
  • Author(s): Kentaro Nomura
  • Organizer: The 2nd NIMS-IMR Workshop on Spin Phononics
  • Int'l Joint Research / Invited
• [Presentation] トポロジカル物質 (2020)
  • Author(s): 野村健太郎
  • Organizer: CREST チュートリアル・ワークショップ 「物質のトポロジカル相の理論的探究」
  • Invited
• [Presentation] Quantized spin pumping and spin torques using helical surface modes (2019)
  • Author(s): Kentaro Nomura
  • Organizer: NIMS-IMR Workshop Program on Spin Phononics
  • Int'l Joint Research / Invited
• [Presentation] トポロジカル半金属の輸送特性とスピン機能 (2019)
  • Author(s): 野村健太郎
  • Organizer: 新学術領域トポロジカル物質科学 第11回トポロジー連携研究会「トポロジカル半金属」
  • Invited
• [Presentation] Spintronics functionalities of topological semimetals (2019)
  • Author(s): Kentaro Nomura
  • Organizer: Purdue University-Tohoku university, Spintronics Workshop II
  • Int'l Joint Research / Invited
• [Presentation] Chiral anomaly and spin-electromagnetic responses in topological materials (2019)
  • Author(s): Kentaro Nomura
  • Organizer: Frontiers in Mathematical Science Research Workshop
  • Int'l Joint Research / Invited
• [Presentation] 熱ホール効果一般についてのレビュー (2019)
  • Author(s): 野村健太郎
  • Organizer: 第12回トポロジー連携研究会「マヨラナ励起の実証に向けて」
  • Invited
• [Presentation] ワイル半金属における軸性アノマリーと磁化ダイナミクス (2019)
  • Author(s): 野村健太郎
  • Organizer: 量子多体系の素核・物性クロスオーバー 高エネルギー加速器研究機構
  • Invited
• [Presentation] トポロジカル物質のスピン機能創出 (2019)
  • Author(s): 野村健太郎
  • Organizer: 日本物理学会 第74回年次大会 シンポジウム「低次元トポロジカル絶縁体・スピン物性の新展開」九州大学
  • Invited
• [Presentation] トポロジカル半金属の電磁応答とスピントロニクス現象 (2018)
  • Author(s): 野村健太郎
  • Organizer: 物性理論のフロンティアと社会への展開 東京大学
  • Invited
• [Presentation] Spintronic functionalities of topological Dirac-Weyl materials (2018)
  • Author(s): Kentaro Nomura
  • Organizer: One-Day Symposium on Spintronic Properties of Graphene and Related 2D Materials The University of Tokyo Kashiwa Campus Station Satellite
  • Int'l Joint Research / Invited
• [Presentation] Spintronics functionalities of topological semimetals (2018)
  • Author(s): Kentaro Nomura
  • Organizer: KITS Workshop 2018 "COLLECTIVE SPIN DYNAMICS IN NANOSTRUCTURES" Kavli ITS, Beijing
  • Int'l Joint Research / Invited
• [Presentation] Anomalous magnetotransport and magnetization dynamics in Weyl semimetals (2018)
  • Author(s): Kentaro Nomura
  • Organizer: TMS-EPiQS 2nd Alliance Workshop, Topological magnets and topological superconductors
  • Int'l Joint Research / Invited
• [Presentation] ワイル磁性体における磁化ダイナミクス (2018)
  • Author(s): 野村健太郎、紅林大地、小林浩二、荒木康史
  • Organizer: スピントロニクス学術研究基盤と連携ネットワーク