Electrical manipulation of Antiferromagnetic State in Non-centrosymmetric Systems

• Project/Area Number: 21K13873
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: The University of Tokyo (2023); Institute of Physical and Chemical Research (2021-2022)
• Principal Investigator: ヌイェン カーン 東京大学, 大学院工学系研究科(工学部), 特任助教 (50775608)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2021: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: Antiferromagnet / Topology / Berry-curvature / Broken-symmetry / Magnetism / Symmetry Breaking / Nonreciprocal transport

Outline of Research at the Start

Antiferromagnet appears as a promising candidate toward realizing denser, faster, and more robust future spin-electronic devices. We focus on develop a simple and efficient method using electric current to manipulate, “read and write”, antiferromagnetic states in a new class of material.

Outline of Annual Research Achievements

In this project, we unveil the possibility of identifying and controlling antiferromagnetic (AFM) states in chiral lattice van der Waals (vdW) magnets CoM3S6 (M=Nb,Ta). While maintaining zero-net magnetization, their non-coplanar spin texture allows for effective probing and control via a fictitious magnetic field accompanied by non-trivial Berry curvature. The main achievement can be stated as the discovery of a large spontaneous thermoelectric Nernst effect as a tool to "read out" antiferromagnetic states, large non-reciprocal transport associated with broken symmetries, and the possibility to switch AFM states by electric current. These results suggest CoM3S6 as a promising platform to investigate unexplored features of antiferromagnets with broken symmetries toward the development of new AFM-based multifunctional spin-electronic devices.

Research Products

• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
• [Journal Article] Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet (2024)
  • Author(s): N. D. Khanh, S. Minami, M. Hirschmann, T. Nomoto, M. C. Jiang, R. Yamada, D. Yamaguchi, Y. Hayashi, Y. Okamura, H. Watanabe, G. Y. Guo, Y. Takahashi, S. Seki, Y. Taguchi, Y. Tokura, R. Arita, M. Hirschberger
  • Journal Title: https://arxiv.org/abs/2403.01113 Volume: 2403.01113 Pages: 1-24
• [Journal Article] Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials (2023)
  • Author(s): H. Takagi, R. Takagi, S. Minami, T. Nomoto, K. Ohishi, M.-T. Suzuki, Y. Yanagi, M. Hirayama, N. D. Khanh, K. Karube, H. Saito, D. Hashizume, R. Kiyanagi, Y. Tokura, R. Arita, T. Nakajima, S. Seki
  • Journal Title: Nature Physics Volume: Advance online publications Issue: 7 Pages: 961-968
  • DOI: 10.1038/s41567-023-02017-3
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quantum oscillations in the centrosymmetric skyrmion-hosting magnet GdRu2Si2 (2023)
  • Author(s): N. Matsuyama, T. Nomura, S. Imajo, T. Nomoto, R. Arita, K. Sudo, M. Kimata, N. D. Khanh, R. Takagi, Y. Tokura, S. Seki, K. Kindo, Y. Kohama
  • Journal Title: Physical Review B Volume: 107 Issue: 10 Pages: 104421-104421
  • DOI: 10.1103/physrevb.107.104421
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Zoology of Multiple‐Q Spin Textures in a Centrosymmetric Tetragonal Magnet with Itinerant Electrons (2022)
  • Author(s): Khanh Nguyen Duy、Nakajima Taro、Hayami Satoru、Gao Shang、Yamasaki Yuichi、Sagayama Hajime、Nakao Hironori、Takagi Rina、Motome Yukitoshi、Tokura Yoshinori、Arima Taka‐hisa、Seki Shinichiro
  • Journal Title: Advanced Science Volume: 9 Issue: 10 Pages: 2105452-2105452
  • DOI: 10.1002/advs.202105452
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Altermagnet 候補物質Fe(Sb1-xTex)2 の磁気構造と物性 (2024)
  • Author(s): 摂待裕生, 高木里奈, 北折曉, Nguyen Duy Khanh, 齋藤開, 中島多朗, 関真一郎
  • Organizer: 日本物理学会2024年春季大会
• [Presentation] Topological Nernst response in a chiral van der Waals antiferromagnet (2024)
  • Author(s): Nguyen Duy Khanh, Susumu Minami, Moritz M. Hirschmann, Ming-Chun Jiang, Rinsuke Yamada, Takuya Nomoto, Daiki Yamaguchi, Yoshihiro Okamura, Youtarou Takahashi, Shinichiro Seki, Yoshinori Tokura, Yasujiro Taguchi, Ryotaro Arita, Max Hirschberger
  • Organizer: CEMS symposium on emergent quantum materials 2024
  • Int'l Joint Research
• [Presentation] Topological Nernst effect in a chiral van der Waals magnet (2023)
  • Author(s): Nguyen Duy Khanh, Susumu Minami, Rinsuke Yamada, Takuya Nomoto, Daiki Yamaguchi, Shinichiro Seki, Yoshinori Tokura, Yasujiro Taguchi, Ryotaro Arita, Max Hirschberger
  • Organizer: 日本物理学会2023年年次大会
• [Presentation] Zoology of multiple-Q spin textures in centrosymmetric tetragonal magnet GdRu2Si2 (2022)
  • Author(s): Nguyen Duy Khanh, Taro Nakajima, Satoru Hayami, Shang Gao, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Rina Takagi, Yukitoshi Motome, Yoshinori Tokura, Taka-hisa Arima, Shinichiro Seki
  • Organizer: 29th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] Multiple-step topological phase transitions in a centrosymmetric tetragonal magnet GdRu2Ge2 (2022)
  • Author(s): Haruto Yoshimochi, Rina Takagi, Satoru Hayami, Jiwon Ju, Nguyen Duy Khanh, Hikaru Saito, Hajime Sagayama, Hironori Nakao, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima, Shinichiro Seki
  • Organizer: 29th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] 磁気スキルミオンストリングの３次元形状の観察 (2022)
  • Author(s): 関真一郎、鈴木基寛、石橋未央、高木里奈、Nguyen Duy Khanh、塩田陽一、柴田基洋、小椎八重航、十倉好紀、小野輝男
  • Organizer: 日本物理学会第77回年次大会
• [Presentation] 異常ホール反強磁性体CoM3S6(M=Nb,Ta)の偏極中性子散乱による磁気構造解析 (2022)
  • Author(s): 高木寛貴、高木里奈、齋藤開、Nguyen Duy Khanh、大石一城、鬼柳亮嗣、野本拓也、見波将、鈴木通人、柳有起、平山元昭、軽部皓介、橋爪大輔、十倉好紀、有田亮太郎、中島多朗、関真一郎
  • Organizer: 日本物理学会第77回年次大会
• [Remarks]
  • URL: https://www.t.u-tokyo.ac.jp/en/press/pr2023-04-21-002