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arXiv 2106.07993cond-mat.mes-hallcond-mat.mtrl-sci
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铁磁合金自旋反常霍尔效应的第一性原理计算

First-principles calculations on the spin anomalous Hall effect of ferromagnetic alloys

Yoshio Miura, Keisuke Masuda

摘要:

铁磁金属中的自旋反常霍尔效应(SAHE),通过在磁性结中引入非磁性间隔层,可以产生自旋-轨道力矩,从而使另一铁磁层的磁化旋转,引起了人们的广泛关注。基于第一性原理密度泛函理论和线性响应理论,对L1 $_0$型合金$X$ Pt($X$ =Fe,Co,Ni)的自旋反常霍尔电导(SAHC)进行了理论研究.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非常小的极化,$ζ$ =SAHC/AHC约为0.1。另一方面,SAHC随着价电子数($N_{\rm v}$)的增加而增加,并且CoPt和NiPt显示出大于1的相对大的$|ζ|$值。AHC的负贡献是CoPt和NiPt中大SAHC和$ζ$的来源,这是由于Pt在少数自旋态的费米能级附近的反键态。

英文摘要:

The spin anomalous Hall effect (SAHE) in ferromagnetic metals, which can generate spin-orbit torque to rotate the magnetization of another ferromagnetic layer through a non-magnetic spacer in magnetic junctions, has attracted much attention. We theoretically investigated the spin anomalous Hall conductivity (SAHC) of the L1$_0$-type alloys $X$Pt($X$=Fe,Co,Ni) 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 effect $ζ$=SAHC/AHC of around 0.1. On the other hand, the SAHC increases with increasing number of valence electrons($N_{\rm v}$), and CoPt and NiPt show relatively large values of $|ζ|$, greater than 1. The negative contribution of the spin-down-down component of AHC is the origin of the large SAHC and $ζ$ in CoPt and NiPt, which is due to the anti-bonding states of Pt around the Fermi level in the minority-spin states.

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