The spin Hall effect as a probe of nonlinear spin fluctuations
arXiv:1209.2799 · doi:10.1038/ncomms2063
Abstract
The spin Hall effect and its inverse play key roles in spintronic devices since 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.
arXiv comment6 pages, 4 figures
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- Critical spin fluctuation mechanism for the spin Hall effect
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- Strong Suppression of the Spin Hall Effect in the Spin Glass State
- Independence of the inverse spin Hall effect with the magnetic phase in thin NiCu films
- Observation of Fluctuation Spin Hall Effect in Antiferromagnet
- Enhancement of Spin-Charge Conversion Efficiency for CoSnS across Transition from Paramagnetic to Ferromagnetic Phase
- Spin treacle in a frustrated magnet observed with spin current
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- Critical enhancement of the spin Hall effect by spin fluctuations
- Dynamics of Pure Spin Current in High-frequency Quantum Regime
- Enhancement of Spin Currents in a Lattice near the Curie Point