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The spin Hall effect as a probe of nonlinear spin fluctuations

Author

Listed:
  • D.H. Wei

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8581, Japan.)

  • Y. Niimi

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8581, Japan.)

  • B. Gu

    (Advanced Science Research Center, Japan Atomic Energy Agency
    CREST, Japan Science and Technology Agency)

  • T. Ziman

    (Institut Laue Langevin, Boîte Postale 156
    LPMMC (UMR 5493) CNRS and Université Joseph Fourier, BP 166)

  • S. Maekawa

    (Advanced Science Research Center, Japan Atomic Energy Agency
    CREST, Japan Science and Technology Agency)

  • Y. Otani

    (Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8581, Japan.
    RIKEN-ASI, 2-1 Hirosawa)

Abstract

The spin Hall effect and its inverse have key roles in spintronic devices as they allow conversion of charge currents to and from spin currents. The conversion efficiency strongly depends on material details, such as the electronic band structure and the nature of impurities. Here we show an anomaly in the inverse spin Hall effect in weak ferromagnetic NiPd alloys near their Curie temperatures with a shape independent of material details, such as Ni concentrations. By extending Kondo's model for the anomalous Hall effect, we explain the observed anomaly as originating from the second-order nonlinear spin fluctuation of Ni moments. This brings to light an essential symmetry difference between the spin Hall effect and the anomalous Hall effect, which reflects the first-order nonlinear fluctuations of local moments. Our finding opens up a new application of the spin Hall effect, by which a minuscule magnetic moment can be detected.

Suggested Citation

  • D.H. Wei & Y. Niimi & B. Gu & T. Ziman & S. Maekawa & Y. Otani, 2012. "The spin Hall effect as a probe of nonlinear spin fluctuations," Nature Communications, Nature, vol. 3(1), pages 1-5, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2063
    DOI: 10.1038/ncomms2063
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