Theory of spin Hall magnetoresistance (SMR) and related phenomena

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Date
2016
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Chen, Yan-Ting
Takahashi, Saburo
Nakayama, Hiroyasu
Althammer, Matthias
Saitoh, Eiji
Bauer, Gerrit E. W.
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Journal of Physics: Condensed Matter ; 28 (2016), 10. - 103004. - Institute of Physics Publishing (IOP). - ISSN 0953-8984. - eISSN 1361-648X
Abstract
We review the so-called spin Hall magnetoresistance (SMR) in bilayers of a magnetic insulator and a metal, in which spin currents are generated in the normal metal by the spin Hall effect. The associated angular momentum transfer to the ferromagnetic layer and thereby the electrical resistance is modulated by the angle between the applied current and the magnetization direction. The SMR provides a convenient tool to non-invasively measure the magnetization direction and spin-transfer torque to an insulator. We introduce the minimal theoretical instruments to calculate the SMR, i.e. spin diffusion theory and quantum mechanical boundary conditions. This leads to a small set of parameters that can be fitted to experiments. We discuss the limitations of the theory as well as alternative mechanisms such as the ferromagnetic proximity effect and Rashba spin-orbit torques, and point out new developments.
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ISO 690CHEN, Yan-Ting, Saburo TAKAHASHI, Hiroyasu NAKAYAMA, Matthias ALTHAMMER, Sebastian T. B. GÖNNENWEIN, Eiji SAITOH, Gerrit E. W. BAUER, 2016. Theory of spin Hall magnetoresistance (SMR) and related phenomena. In: Journal of Physics: Condensed Matter. Institute of Physics Publishing (IOP). 28(10), 103004. ISSN 0953-8984. eISSN 1361-648X. Available under: doi: 10.1088/0953-8984/28/10/103004
BibTex
@article{Chen2016-03-16Theor-52408,
  year={2016},
  doi={10.1088/0953-8984/28/10/103004},
  title={Theory of spin Hall magnetoresistance (SMR) and related phenomena},
  number={10},
  volume={28},
  issn={0953-8984},
  journal={Journal of Physics: Condensed Matter},
  author={Chen, Yan-Ting and Takahashi, Saburo and Nakayama, Hiroyasu and Althammer, Matthias and Gönnenwein, Sebastian T. B. and Saitoh, Eiji and Bauer, Gerrit E. W.},
  note={Article Number: 103004}
}
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