Interface-driven electrical magnetochiral anisotropy in Pt/PtMnGa bilayers

Nonreciprocal charge transport, which is frequently termed as electrical magnetochiral anisotropy (EMCA) in chiral conductors, touches the most important elements of modern condensed matter physics. Here, we have investigated large EMCA Pt/PtMnGa (PMG) bilayers, can be attributed to nonreciprocal response an interface-driven transport channel. Different from traditional linear current-dependent EMCA, for Pt/PMG higher-order coefficients should phenomenally added especially small current region. This unusual behavior has been explained based on both quantum and semiclassical models. Furthermore, a combination asymmetrical electron scattering spin-dependent furnish PMG thickness-dependent behaviors bilayers. The dramatically enhanced anomalous Hall angle further demonstrates modified surface state properties by strong spin–orbit coupling.