Theoretical study of interfacial damping in perpendicular anisotropy superlattices along multiple crystal orientations

T. Qu and R. H. Victora
Phys. Rev. B 93, 224426 – Published 27 June 2016

Abstract

Damping, representing the loss of magnetic energy from the electrons to the lattice through the spin-orbit interaction, is calculated for Co/Pt and Co/Pd superlattices grown along the (001), (111), and (011) orientations. The damping consists of two contributions: interfacial and, usually, bulk. The interfacial damping shows dependence on the superlattice orientation. The origin of the interfacial damping is due to both the distorted electronic states at the interface and the spin-orbit interaction in the weakly polarized nonmagnetic Pt/Pd layers deposited on Co layers. The density of states around the Fermi level provides the spin-flip channels and closely correlates with the damping value. The damping shows asymmetry in the two transverse directions of the spin for spins at most angles. The damping for out-of-plane magnetization can be as much as 1.7 times larger than that of in-plane magnetization.

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  • Received 10 March 2016
  • Revised 17 May 2016

DOI:https://doi.org/10.1103/PhysRevB.93.224426

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Qu1 and R. H. Victora1,2,*

  • 1School of Physics and Astronomy, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455 USA
  • 2Department of Electrical Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455 USA

  • *victora@ece.umn.edu

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Issue

Vol. 93, Iss. 22 — 1 June 2016

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