论文标题
磁性自旋和轨道大厅的理论以及散装铁磁体中的nernst效应
Theory of magnetic spin and orbital Hall and Nernst effects in bulk ferromagnets
论文作者
论文摘要
磁性自旋大厅效应（MSHE）是一种异常的电荷到旋转转换现象，发生在铁磁材料中。与传统的旋转大厅效应（SHA）相反，是时间反转的效果，磁性对应物是时间反转的。在这项工作中，我们使用AB的从头计算来研究大量铁磁铁FE，CO和NI的MSHE。 FE和CO的MSHE的幅度与SHE的幅度相当，但是MSHE强烈依赖于电子寿命和MSHE，而且她可以具有相反的迹象。对于ni而言，MSHE比SHE小，但总的来说，对于旋转轨道扭矩，MSHE不能忽略。考虑到电流电流，我们分析了MSHE和她如何贡献总霍尔角度。我们将对MSHE的分析扩展到其轨道对应物，即磁轨道霍尔效应（MOHE），为此，我们表明MOHE通常小于轨道霍尔效应（OHE）。我们进一步计算热类似物，即自旋和轨道Nernst效应及其磁性效应。在这里，我们的计算表明，Ni的磁性自旋和轨道NERST效应大大比FE和Co的磁性效应大得多。
The magnetic spin Hall effect (MSHE) is an anomalous charge-to-spin conversion phenomenon which occurs in ferromagnetic materials. In contrast to the conventional spin Hall effect (SHE), being a time-reversal even effect, the magnetic counterpart is time-reversal odd. In this work, we use ab initio calculations to investigate the MSHE for the bulk ferromagnets Fe, Co, and Ni. The magnitudes of the MSHE of Fe and Co are comparable to those of the SHE, but the MSHE is strongly dependent on the electron lifetime and the MSHE and SHE can moreover have opposite signs. For Ni the MSHE is smaller than the SHE, but in general, the MSHE cannot be ignored for spin-orbit torques. Considering a charge current we analyze how both the MSHE and SHE contribute to a total Hall angle. We extend our analysis of the MSHE to its orbital counterpart, that is, the magnetic orbital Hall effect (MOHE), for which we show that the MOHE is in general smaller than the orbital Hall effect (OHE). We compute furthermore the thermal analogs, i.e., the spin and orbital Nernst effects, and their magnetic counterparts. Here our calculations show that the magnetic spin and orbital Nernst effects of Ni are substantially larger than those of Fe and Co.
