Manipulation of Exchange Bias in Two-Dimensional van der Waals Ferromagnet Near Room Temperature
As a host for exchange bias (EB), van der Waals (vdW) magnetic materials have exhibited intriguing and distinct functionalities from conventional magnetic materials. The EB in most vdW systems is far below room temperature, which poses a challenge for practical applications. Here, by using Kerr microscopy, we demonstrate a record-high blocking temperature that approaches room temperature and a huge positive EB field that nears 2 kOe at 100 K in naturally oxidized two-dimensional (2D) vdW ferromagnetic Fe<sub>3</sub>GaTe<sub>2</sub> nanoflakes. Moreover, we realized a reversible manipulation of both the presence/absence and positive/negative signs of EB via a training magnetic field without multiple field cooling processes. Thus, our study clearly reveals the robust, sizable, and sign-tunable EB in vdW magnetic materials up to near room temperature, thereby establishing Fe<sub>3</sub>GaTe<sub>2</sub> as an emerging room-temperature-operating vdW material and paving the way for designing practical 2D spintronic devices.
Authors
- Shouguo Wang (ORCID: https://orcid.org/0000-0002-4488-2645)
- Dongsheng Song (ORCID: https://orcid.org/0000-0003-1975-7671)
- He Huang (ORCID: https://orcid.org/0000-0003-1335-3174)
- Zhaoliang Liao (ORCID: https://orcid.org/0000-0003-1701-9456)
- Yanan Yuan (ORCID: https://orcid.org/0000-0003-3936-5464)
- Yong Fang (ORCID: https://orcid.org/0000-0002-9218-5537)
- Xucai Kan (ORCID: https://orcid.org/0000-0001-7529-0186)
- Mengmeng Yang (ORCID: https://orcid.org/0000-0002-3004-8991)
- Tianye Wang (ORCID: https://orcid.org/0000-0002-8863-8054)
- Fangfang Pei
- Qian Li (ORCID: https://orcid.org/0000-0003-0255-4835)
- Siyu Wang (ORCID: https://orcid.org/0000-0002-5990-8887)
- Xue Liu (ORCID: https://orcid.org/0000-0002-9588-5491)
- Xiaoli Chen (ORCID: https://orcid.org/0000-0001-7734-9567)
- Lin Li (ORCID: https://orcid.org/0000-0002-0533-7783)
- Junming Guo (ORCID: https://orcid.org/0000-0002-3133-5597)
- Jiapeng Zhao
- Shiming Zhou (ORCID: https://orcid.org/0000-0003-3280-2473)
- Zi Qiang Qiu
- Daxiang Liu
Institutions
- University of Science and Technology of China (CN)
- Anhui University (CN)
- Suzhou University of Technology (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- National Synchrotron Radiation Laboratory (CN)
- University of Science and Technology Beijing (CN)
- University of California, Berkeley (US)
Publication Details
- Journal
- ACS Nano
- Published
- 2024-08-15
- DOI
- https://doi.org/10.1021/acsnano.4c09142
- Citations
- 10
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.17
Funders
- U.S. Department of Energy
- National Natural Science Foundation of China
- National Research Foundation of Korea
- King Abdullah University of Science and Technology
- University of Science and Technology of China
- Natural Science Foundation of Anhui Province
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities