Electrical manipulation of Antiferromagnetic State in Non-centrosymmetric Systems

2022 Fiscal Year Research-status Report

• Project/Area Number: 21K13873
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: ヌイェン カーン 国立研究開発法人理化学研究所, 創発物性科学研究センター, 研究員 (50775608)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: Magnetism / Antiferromagnet / Symmetry Breaking

Outline of Annual Research Achievements

Antiferromagnetic materials recently appear as a promising candidate toward realizing denser, faster, and more robust future spin-electronic devices, despite the difficulty to control. In this work, we aim to develop and investigate a new class of antiferromagnetic materials, transition metal intercalated van der Waals materials with non-coplanar spin texture. Utilizing the unique feature of simultaneous symmetry breaking in this material, we would like to pursuit 2 targets: (i) Non-reciprocal transport phenomena in chiral antiferromagnet with broken time-reversal symmetry and (ii) Manipulation of antiferromagnetic states with electric current. Successful observation of these phenomene may pave a new way toward establishing an effective method for reading out and writing AFM states.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

At the current stage, the large single crystal was succesfully grown and characterized the non-coplanar magnetic structure. The sample also exhibits large anomalous Hall effect accompanied with an odd-parity linear magnetoresistance (MR) arises from antiferromagnetic order with broken time reversal symmetry. The non-reciprocal MR and spontaneous Hall resistivity exhibit similar scaling behavior upon temperature variation and field cooling, which evidences the correlation between antiferromagnetic order. In order to observe higher order non-reciprocal transport property, we fabricated the micro-device using focused ion beam technique. By reduced the sample dimension and contact condition, we observed the electrical magnetochiral effect, as well as proceeded to the switching magnetic state using electric current.

Strategy for Future Research Activity

As for the future plan, we are currently summarizing the results into manuscript. In addition, as for the purpose of switching magnetic state, reversal of AFM states via reading out the Hall resistivity has been achieved, the controllable / deterministic switching is highly desired because of the the random nucleation of magnetic domain due to heating generated via application of current pulse. To overcome this issue, improving the device configuration is required to reduce the impact of undesired heating. In addition, because this class of material allows to exfoliate into thin flake, investigation the evolution of magnetic property upon reducing sample dimention is also one of interesting issues for future study.

Causes of Carryover

The remain amount is transfered to this fiscal year because of the postpone of International Conference due to COVID-19; This will be used for payment for attending the conference in this fiscal year.

Remarks

プレスリリース/ 反強磁性体におけるトポロジカルホール効果の実証に成功 ―磁気情報の新しい読み出し手法としての活用に期待―

Research Products

• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: Oak Ridge National Laboratory
• [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 Pages: -
  • 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 Pages: 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): 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
  • Journal Title: Advanced Science Volume: 9 Pages: 2105452
  • DOI: 10.1002/advs.202105452
  • Peer Reviewed / Open Access / Int'l Joint Research
• [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