论文标题
各向异性磁化和实验确认的内在机制$ _x $ _x $ fe $ _ {1-x} $单晶电影
Intrinsic mechanism for anisotropic magnetoresistance and experimental confirmation in Co$_x$Fe$_{1-x}$ single-crystal films
论文作者
论文摘要
使用第一原理传输计算，我们预测单晶Co $ _x $ _x $ fe $ _ {1-x} $合金的各向异性磁磁性（AMR）在很大程度上取决于当前的方向和合金浓度。由于磁化依赖性对称性保护，发现了AMR的固有机制。这些特殊的$ k $ - 点可以通过改变合金组成，从而使交换分裂的变化转移到或远离费米的能量，从而允许AMR可调性。通过精致的运输测量结果证实了该预测，这进一步揭示了沿不同晶体轴的纵向和横向电阻的相互关系。
Using first-principles transport calculations, we predict that the anisotropic magnetoresistance (AMR) of single-crystal Co$_x$Fe$_{1-x}$ alloys is strongly dependent on the current orientation and alloy concentration. An intrinsic mechanism for AMR is found to arise from the band crossing due to magnetization-dependent symmetry protection. These special $k$-points can be shifted towards or away from the Fermi energy by varying the alloy composition and hence the exchange splitting, thus allowing AMR tunability. The prediction is confirmed by delicate transport measurements, which further reveal a reciprocal relationship of the longitudinal and transverse resistivities along different crystal axes.
