Roles of nonlocal conductivity on spin Hall angle measurement

Kai Chen and Shufeng Zhang
Phys. Rev. B 96, 134401 – Published 2 October 2017

Abstract

Spin Hall angle characterizes the rate of spin-charge current conversion and it has become one of the most important material parameters for spintronics physics and device application. A long-standing controversy is that the spin Hall angles for a given material measured by spin pumping and by spin Hall torque experiments are inconsistent and they could differ by as much as an order of magnitude. By using the linear response spin transport theory, we explicitly formulate the relation between the spin Hall angle and measured variables in different experiments. We find that the nonlocal conductivity inherited in the layered structure plays a key role to resolve conflicting values of the spin Hall angle. We provide a generalized scheme for extracting spin transport coefficients from experimental data.

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  • Received 16 April 2017
  • Revised 8 September 2017

DOI:https://doi.org/10.1103/PhysRevB.96.134401

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kai Chen and Shufeng Zhang

  • Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

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Issue

Vol. 96, Iss. 13 — 1 October 2017

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