Electrical manipulation of Antiferromagnetic State in Non-centrosymmetric Systems

2023 Fiscal Year Annual Research Report

• Project/Area Number: 21K13873
• Research Institution: The University of Tokyo
• 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
• Keywords: Antiferromagnet / Topology / Berry-curvature / Broken-symmetry

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

• [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
• [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