Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films
Abstract 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., magn...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-07-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00802-2 |
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| author | Jing Meng Huali Yang Yu Shen Kun Zheng Hongru Wang Yuhao Wang Keqi Xia Bocheng Yu Xiaoyan Zhu Baiqing Lv Yaobo Huang Jie Ma Dariusz Jakub Gawryluk Toni Shiroka Zhenzhong Yang Yang Xu Qingfeng Zhan Tian Shang |
| author_facet | Jing Meng Huali Yang Yu Shen Kun Zheng Hongru Wang Yuhao Wang Keqi Xia Bocheng Yu Xiaoyan Zhu Baiqing Lv Yaobo Huang Jie Ma Dariusz Jakub Gawryluk Toni Shiroka Zhenzhong Yang Yang Xu Qingfeng Zhan Tian Shang |
| author_sort | Jing Meng |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-7146bd12dca5429daf6e22fdc98c78f8 |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-7146bd12dca5429daf6e22fdc98c78f82025-08-20T03:45:40ZengNature Portfolionpj Quantum Materials2397-46482025-07-0110111010.1038/s41535-025-00802-2Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 filmsJing Meng0Huali Yang1Yu Shen2Kun Zheng3Hongru Wang4Yuhao Wang5Keqi Xia6Bocheng Yu7Xiaoyan Zhu8Baiqing Lv9Yaobo Huang10Jie Ma11Dariusz Jakub Gawryluk12Toni Shiroka13Zhenzhong Yang14Yang Xu15Qingfeng Zhan16Tian Shang17Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityZhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of SciencesKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityTsung-Dao Lee Institute, Zhangjiang Institute for Advanced Study, School of Physics and Astronomy, Shanghai Jiao Tong UniversityShanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of SciencesKey Laboratory of Artificial Structures and Quantum Control, School of Physics and Astronomy, Shanghai Jiao Tong UniversityPSI Center for Neutron and Muon Sciences CNMPSI Center for Neutron and Muon Sciences CNMKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityKey Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal UniversityAbstract 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.https://doi.org/10.1038/s41535-025-00802-2 |
| spellingShingle | Jing Meng Huali Yang Yu Shen Kun Zheng Hongru Wang Yuhao Wang Keqi Xia Bocheng Yu Xiaoyan Zhu Baiqing Lv Yaobo Huang Jie Ma Dariusz Jakub Gawryluk Toni Shiroka Zhenzhong Yang Yang Xu Qingfeng Zhan Tian Shang Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films npj Quantum Materials |
| title | Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films |
| title_full | Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films |
| title_fullStr | Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films |
| title_full_unstemmed | Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films |
| title_short | Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe3Ga4 films |
| title_sort | large unconventional anomalous hall effect far above room temperature in epitaxial fe3ga4 films |
| url | https://doi.org/10.1038/s41535-025-00802-2 |
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