Observation of High-Order Anisotropic Magnetoresistance in a Cubic Ferromagnet

Haoran Chen; Yue Chen; Yizi Feng; Ruda Guo; Yuanfei Fan; Hongyue Xu; Tong Wu; Zhongxun Guo; Di Yue; Xiaofeng Jin; Yi Liu; Zhe Yuan; Yizheng Wu

arXiv · 2512.21224

Observation of High-Order Anisotropic Magnetoresistance in a Cubic Ferromagnet

Haoran Chen·Yue Chen·Yizi Feng·Ruda Guo·Yuanfei Fan·Hongyue Xu·Tong Wu·Zhongxun Guo·Di Yue·Xiaofeng Jin·Yi Liu·Zhe Yuan·Yizheng Wu

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Abstract

High-order anisotropic magnetoresistance (AMR) is observed up to the 18th harmonic in cubic Fe(001) thin films, overturning the long-standing paradigm that only two- and four-fold terms are symmetry-allowed. Using angle-resolved transport and Fourier analysis, we show that six-fold and higher-order terms are intrinsic, tunable by temperature and thickness, and predicted by crystal symmetry. Microscopically, the two-fold sign reversal arises from a crossover between weak and strong scattering regimes, while high-order terms emerge from the interplay of anisotropic Fermi velocity and relaxation time. Our results establish high-order AMR as a symmetry-prescribed property of cubic ferromagnets, providing critical benchmarks for spin-orbit transport theory and enabling new angular-sensitive spintronic functionalities.

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Haoran Chen, Yue Chen, Yizi Feng, Ruda Guo, Yuanfei Fan, Hongyue Xu, Tong Wu, Zhongxun Guo, Di Yue, Xiaofeng Jin, Yi Liu, Zhe Yuan, Yizheng Wu. 2025-12-24. Observation of High-Order Anisotropic Magnetoresistance in a Cubic Ferromagnet. https://arxiv.org/abs/2512.21224

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