Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films
Noncoplanar spin textures usually exhibit a finite scalar spin chirality (SSC) that can generate effective magnetic fields and lead to additional contributions to the Hall effect, namely topological or unconventional anomalous Hall effect (UAHE). Unlike topological spin textures (e.g., magnetic skyrmions), materials that exhibit fluctuation-driven SSC and UAHE are rare. So far, their realization has been limited to either low temperatures or high magnetic fields, both of which are unfavorable for practical applications. Identifying new materials that exhibit UAHE in a low magnetic field at room temperature is therefore essential. Here, we report the discovery of a large UAHE far above room temperature in epitaxial Fe3Ga4 films, where the fluctuation-driven SSC stems from the field-induced transverse-conical-spiral phase. Considering their epitaxial nature and the large UAHE stabilized at room temperature in a low magnetic field, Fe3Ga4 films represent an exciting, albeit rare, example of a promising material for spintronic devices.
Authors
- Jie Ma (ORCID: https://orcid.org/0000-0003-4932-9205)
- Dariusz Jakub Gawryluk (ORCID: https://orcid.org/0000-0003-4460-7106)
- Huali Yang (ORCID: https://orcid.org/0000-0002-4889-2410)
- Jing Meng (ORCID: https://orcid.org/0009-0005-2717-1875)
- Yaobo Huang (ORCID: https://orcid.org/0000-0002-4662-7752)
- T. Shiroka (ORCID: https://orcid.org/0000-0001-8624-2649)
- Zhenzhong Yang (ORCID: https://orcid.org/0000-0002-7226-7973)
- Tian Shang (ORCID: https://orcid.org/0000-0002-5916-0020)
- Yang Xu (ORCID: https://orcid.org/0000-0002-4460-8013)
- Keqi Xia (ORCID: https://orcid.org/0009-0002-2793-579X)
- Qingfeng Zhan (ORCID: https://orcid.org/0000-0003-4614-9735)
- Xiaoyan Zhu (ORCID: https://orcid.org/0000-0001-6121-9709)
- Yuhao Wang (ORCID: https://orcid.org/0009-0003-2254-7162)
- Kun Zheng (ORCID: https://orcid.org/0000-0003-1324-7240)
- Hongru Wang (ORCID: https://orcid.org/0009-0008-2450-0081)
- Yu Shen (ORCID: https://orcid.org/0009-0005-3874-2514)
- Baiqing Lv (ORCID: https://orcid.org/0000-0002-5804-3711)
- Bocheng Yu
Institutions
- Chongqing Normal University (CN)
- Shanghai Jiao Tong University (CN)
- Chinese Academy of Sciences (CN)
- Paul Scherrer Institute (CH)
- ETH Zurich (CH)
- Shanghai Advanced Research Institute (CN)
- Institute of Natural Science (KP)
- Ningbo Institute of Industrial Technology (CN)
- East China Normal University (CN)
Publication Details
- Journal
- npj Quantum Materials
- Published
- 2025-07-21
- DOI
- https://doi.org/10.1038/s41535-025-00802-2
- Primary Topic
- Magnetic properties of thin films
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Natural Science Foundation of Shanghai
- Salt Science Research Foundation
- National Natural Science Foundation of China
- Natural Science Foundation of Chongqing
- Centre Scientifique et Technique du Bâtiment
- Natural Science Foundation Project of Chongqing, Chongqing Science and Technology Commission
- Fundamental Research Funds for the Central Universities