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Origins of the Unidirectional Spin Hall Magnetoresistance in Metallic Bilayers

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Avci C. O., Mendil J., Beach G. S. D., Gambardella P.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Phys Rev Lett
Volume (Issue) 121(8)
Page(s) 087207 - 087207
ISBN 1079-7114 (Electronic) 0031-9007 (Linking)
Title of proceedings Phys Rev Lett
DOI 10.1103/physrevlett.121.087207

Open Access

URL https://arxiv.org/abs/1806.05305
Type of Open Access Repository (Green Open Access)

Abstract

Recent studies evidenced the emergence of asymmetric electron transport in layered conductors owing to the interplay between electrical conductivity, magnetization, and the spin Hall or Rashba-Edelstein effects. Here, we investigate the unidirectional magnetoresistance (UMR) caused by the current-induced spin accumulation in Co/Pt and CoCr/Pt bilayers. We identify three competing mechanisms underpinning the resistance asymmetry, namely, interface and bulk spin-dependent electron scattering and electron-magnon scattering. Our measurements provide a consistent description of the current, magnetic field, and temperature dependence of the UMR and show that both positive and negative UMR can be obtained by tuning the interface and bulk spin-dependent scattering.
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