The spin Hall effect as a probe of nonlinear spin fluctuations

D.H. Wei, Y. Niimi (), B. Gu, T. Ziman, S. Maekawa and Y. Otani
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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
T. Ziman: Institut Laue Langevin, Boîte Postale 156
S. Maekawa: Advanced Science Research Center, Japan Atomic Energy Agency
Y. Otani: Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8581, Japan.

Nature Communications, 2012, vol. 3, issue 1, 1-5

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2063

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