Two-vector magnetoresistance as a unified explanation for UMR
Unusual magnetoresistance (UMR)—a change in resistivity when magnetization rotates perpendicular to the current—has long puzzled researchers. Traditionally linked to spin Hall magnetoresistance (SMR) and other spin-current-based models, UMR has been widely observed even in systems where these mechanisms should not apply. This inconsistency has fueled a proliferation of alternative explanations, from Rashba-Edelstein MR to orbital Hall MR.
Now, a study led by Prof. Lijun Zhu (Institute of Semiconductors, CAS) and Prof. Xiangrong Wang (CUHK) provides experimental evidence that UMR has a far simpler and universal origin: interfacial electron scattering governed jointly by the magnetization vector and interfacial electric field. Dubbed two-vector magnetoresistance, this model reproduces key features of UMR—including giant signals in single-layer magnetic metals, high-order contributions, and a striking universal sum rule—without invoking spin or orbital currents or crystalline symmetry.
Source: https://www.spintronics-info.com/two-vector-magnetoresistance-unified-explanation-umr
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