Evaluation of Spin Hall Effect in Ferromagnets by Means of Unidirectional Spin Hall Magnetoresistance in Ta/Co Bilayers

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  • Aoki M.
    Department of Electric Science and Engineering, Kyoto Univ. Center for Spintronics Research Network, Institute of Chemical Research, Kyoto Univ.
  • Ohshima R.
    Department of Electric Science and Engineering, Kyoto Univ. Center for Spintronics Research Network, Institute of Chemical Research, Kyoto Univ.
  • Shinjo T.
    Department of Electric Science and Engineering, Kyoto Univ.
  • Shiraishi M.
    Department of Electric Science and Engineering, Kyoto Univ. Center for Spintronics Research Network, Institute of Chemical Research, Kyoto Univ.
  • Ando Y.
    Department of Electric Science and Engineering, Kyoto Univ. Center for Spintronics Research Network, Institute of Chemical Research, Kyoto Univ. PRESTO, Japan Science and Technology Agency

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<p>  We investigate unidirectional spin Hall magnetoresistance (USMR) in Ta/Co bilayer systems with various Co thicknesses. A negative USMR is observed when the thickness of Co is thin due to the negative spin Hall angle of Ta, as expected from the conventional framework. However, as the Co thickness increases, the amplitude of USMR becomes strongly suppressed, and the sign of USMR becomes positive, which cannot be explained by theoretical calculation considering only the spin Hall effect (SHE) in the Ta layer. We successfully explain the anomalous thickness dependence of USMR by considering USMR induced by SHE in the Co layer. This work verifies the significant influence of SHE in ferromagnets on the measurement of USMR and will contribute to a better understanding of USMR.</p>

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