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  • Letter
  • Open Access

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

Yoshio Miura1,2,* and Keisuke Masuda1

  • 1Research Center for Magnetic and Spintronic Materials (CMSM), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
  • 2Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Machikaneyama 1-3, Toyonaka, Osaka 560-8531, Japan

  • *miura.yoshio@nims.go.jp
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Phys. Rev. Materials 5, L101402 – Published 29 October, 2021

DOI: https://doi.org/10.1103/PhysRevMaterials.5.L101402

Abstract

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 L10-type alloys XPt (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 an increasing number of valence electrons (Nv), 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 antibonding states of Pt around the Fermi level in the minority-spin states.

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Information

Phys. Rev. Materials 5, L101402– Published 29 October, 2021
  • Received 15 June 2021
  • Revised 4 October 2021
  • Accepted 12 October 2021
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