First-principles calculations on the spin anomalous Hall effect of ferromagnetic alloys
First-principles calculations on the spin anomalous Hall effect of ferromagnetic alloys
复制标题
铁磁合金自旋反常霍尔效应的第一性原理计算
DOI：
10.1103/physrevmaterials.5.l101402
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发表时间：
2021
影响因子：
3.4
通讯作者：
Yoshio Miura and Masuda Keisuke
中科院分区：
文献类型：
--
作者：
Xue Yibei;Yin Shu;榎木勝徳，大谷博司;松田 翔風，新妻祐希，吉田祐太，梅田実;大谷博司，榎木勝徳;Yoshio Miura and Masuda Keisuke
铁磁金属中的自旋反常霍尔效应（SAHE）引起了人们的广泛关注，该效应可以产生自旋轨道转矩，使另一铁磁层的磁化通过磁结中的非磁性间隔物进行旋转。基于第一性原理密度泛函理论和线性响应理论，从理论上研究了该类合金（）的自旋反常霍尔电导率（SAHC）。我们发现FePt的SAHC远小于异常霍尔电导率（AHC），导致异常霍尔效应的极化非常小，约为0.1。另一方面，SAHC随着价电子数（）的增加而增加，CoPt和NiPt的值较大，均大于1。AHC的自旋向下分量的负贡献是CoPt和NiPt中大SAHC的来源，这是由于Pt在少数自旋态中在费米能级附近的反键态。
The spin anomalous Hall effect (SAHE) in ferromagnetic metals, which can generate a spin-orbit torque to rotate the magnetization of another ferromagnetic layer through a nonmagnetic spacer in magnetic junctions, has attracted much attention. We theoretically investigated the spin anomalous Hall conductivity (SAHC) of the-type alloys() on the basis of first-principles density functional theory and linear response theory. We found that the SAHC of FePt is much smaller than the anomalous Hall conductivity (AHC), leading to very small polarization for the anomalous Hall effectof around 0.1. On the other hand, the SAHC increases with an increasing number of valence electrons (), and CoPt and NiPt show relatively large values of, greater than 1. The negative contribution of the spin-down-down component of AHC is the origin of the large SAHC andin CoPt and NiPt, which is due to the antibonding states of Pt around the Fermi level in the minority-spin states.