Unraveling anomalous Hall effect mechanisms in perpendicularly magnetized NiCo<sub>2</sub>O<sub>4</sub> epitaxial films
Abstract Room-temperature coexistence of metallic conductivity and robust perpendicular magnetic anisotropy (PMA) is vital for spintronics. We systematically investigate thickness- and temperature-dependent magnetotransport in epitaxial (001) NiCo 2 O 4 /MgAl 2 O 4 films. Square anomalous Hall hysteresis loops persist over the entire temperature range, maintaining strong PMA at a thickness of 10 nm. Anomalous Hall conductivity ( σ xy ) shows nonmonotonic temperature dependence, indicating competing mechanisms. Scaling analysis of σ xy versus longitudinal conductivity ( σ xx ) reveals dual contributions from intrinsic Berry curvature and extrinsic skew-scattering. The unexpected skew-scattering in this system highlights unconventional charge transport behavior in NiCo 2 O 4 , necessitating further study of electronic correlations and anomalous Hall effect mechanisms in oxides.
Authors
- Shujuan Yang (ORCID: https://orcid.org/0000-0002-6929-4823)
- Hui Yang (ORCID: https://orcid.org/0000-0002-2287-2243)
- Xiaolin Liang (ORCID: https://orcid.org/0000-0002-5479-4067)
- Peixin Li
- Hongyu An (ORCID: https://orcid.org/0000-0001-6459-2269)
- Xinjun Li (ORCID: https://orcid.org/0000-0002-0506-5618)
- Yixin Zhang (ORCID: https://orcid.org/0000-0002-3240-6174)
- Qianwen Wang (ORCID: https://orcid.org/0000-0003-3553-1162)
- H.B. LIU
Institutions
- Shenzhen Technology University (CN)
- Shenzhen Academy of Aerospace Technology (CN)
Publication Details
- Journal
- Japanese Journal of Applied Physics
- Published
- 2025-09-01
- DOI
- https://doi.org/10.35848/1347-4065/ae0543
- Primary Topic
- Magnetic Field Sensors Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.00