Origins of the Unidirectional Spin Hall Magnetoresistance in Metallic Bilayers
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PhysRevLett.121.087207.pdf
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Author(s)
Mendil, Johannes
Gambardella, Pietro
Avci, Can Onur
Beach, Geoffrey Stephen
Date Issued
August 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Avci, Can Onur et al. "Origins of the Unidirectional Spin Hall Magnetoresistance in Metallic Bilayers." Physical Review Letters 121, 8 (August 2018): 0827207 © 2018 American Physical Society
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.087207
