Generalized spin-transfer torque and collective spin dynamics in disordered magnets

ORAL

Abstract

We provide a generalized theory of spin transfer and reciprocal pumping effects at interfaces between metals and non-collinear magnets, including the cases of spin glasses and amorphous magnets. The theory is based on energetics rather than spin conservation, albeit the latter is recovered in the appropriate language. The generalized spin-mixing conductance tensor is parametrized by three coefficients, corresponding to the three independent generators of spin rotations. In the limit of exchange-dominated interactions, those correspond to the soft modes of the macroscopic, coarse-grained dynamics, restoring the fully broken rotational symmetry. We employ this formalism to demonstrate that disordered magnets represent a very versatile platform for spin transport, sustaining long-range drag signals between metal contacts even in the presence of damping sources.

*This work was supported by the US Department of Energy, Office of Basic Energy Sciences under Award No. DE-SC0012190.

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Presenters

  • Hector Ochoa

    • Physics and Astronomy, University of California, Los Angeles

Authors

  • Hector Ochoa

    • Physics and Astronomy, University of California, Los Angeles

  • Yaroslav Tserkovnyak

    • University of California, Los Angeles
    • Physics, University of California Los Angeles
    • Department of Physics and Astronomy, Univ of California - Los Angeles
    • Physics and Astronomy, University of California, Los Angeles
    • Univ of California - Los Angeles
    • Physics and Astronomy, Univ of California - Los Angeles
    • Physics and Astronomy, University of California Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles
    • Physics, Univ of California - Los Angeles
    • Department of Physics and Astronomy, University of California Los Angeles