自旋翻转跃迁在FePt合金反常霍尔效应中的作用
The role of spin-flip transitions in the anomalous Hall effect of FePt alloy
摘要：
我们进行了第一性原理计算，证明了自旋轨道相互作用的非自旋守恒部分的重要性，为有序FePt合金的本征反常霍尔电导率。如果Pt被较轻的等电子元素Pd取代，这种相互作用的影响会大大降低。负责异常速度的带间跃迁的分析表明，自旋翻转跃迁不仅发生在费米能级附近的避免带交叉，但也有类似的色散以及分离的带对之间。我们还预测了强烈的各向异性的FePt的异常霍尔电导率完全由低频自旋翻转跃迁。
英文摘要：
We carry out first-principles calculations which demonstrate the importance of the non-spin-conserving part of the spin-orbit interaction for the intrinsic anomalous Hall conductivity of ordered FePt alloys. The impact of this interaction is strongly reduced if Pt is replaced by the lighter isoelectronic element Pd. An analysis of the interband transitions responsible for the anomalous velocity reveals that spin-flip transitions occur not only at avoided band crossings near the Fermi level, but also between well-separated pairs of bands with similar dispersions. We also predict a strong anisotropy in the anomalous Hall conductivity of FePt caused entirely by low-frequency spin-flip transitions.
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