Theory of spin Hall magnetoresistance

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2013
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Chen, Yan-Ting
Takahashi, Saburo
Nakayama, Hiroyasu
Althammer, Matthias
Saitoh, Eiji
Bauer, Gerrit E. W.
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Physical Review B. American Physical Society (APS). 2013, 87(14), 144411. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.87.144411
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We present a theory of the spin Hall magnetoresistance (SMR) in multilayers made from an insulating ferromagnet F, such as yttrium iron garnet (YIG), and a normal metal N with spin-orbit interactions, such as platinum (Pt). The SMR is induced by the simultaneous action of spin Hall and inverse spin Hall effects and therefore a nonequilibrium proximity phenomenon. We compute the SMR in F|N and F|N|F layered systems, treating N by spin-diffusion theory with quantum mechanical boundary conditions at the interfaces in terms of the spin-mixing conductance. Our results explain the experimentally observed spin Hall magnetoresistance in N|F bilayers. For F|N|F spin valves we predict an enhanced SMR amplitude when magnetizations are collinear. The SMR and the spin-transfer torques in these trilayers can be controlled by the magnetic configuration.

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ISO 690CHEN, Yan-Ting, Saburo TAKAHASHI, Hiroyasu NAKAYAMA, Matthias ALTHAMMER, Sebastian T. B. GOENNENWEIN, Eiji SAITOH, Gerrit E. W. BAUER, 2013. Theory of spin Hall magnetoresistance. In: Physical Review B. American Physical Society (APS). 2013, 87(14), 144411. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.87.144411
BibTex
@article{Chen2013-02-06T13:04:33ZTheor-52435,
  year={2013},
  doi={10.1103/PhysRevB.87.144411},
  title={Theory of spin Hall magnetoresistance},
  number={14},
  volume={87},
  issn={2469-9950},
  journal={Physical Review B},
  author={Chen, Yan-Ting and Takahashi, Saburo and Nakayama, Hiroyasu and Althammer, Matthias and Goennenwein, Sebastian T. B. and Saitoh, Eiji and Bauer, Gerrit E. W.},
  note={Article Number: 144411}
}
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