Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
新見 康洋*; 木俣 基*; 大森 康智*; Gu, B.; Ziman, T.*; 前川 禎通; Fert, A.*; 大谷 義近*
Physical Review Letters, 115(19), p.196602_1 - 196602_5, 2015/11
被引用回数：12 パーセンタイル：63.05(Physics, Multidisciplinary)We have measured spin Hall effects in spin glass metals, CuMnBi alloys, with the spin absorption method in the lateral spin valve structure. Far above the spin glass temperature 
where the magnetic moments of Mn impurities are randomly frozen, the spin Hall angle of a CuMnBi ternary alloy is as large as that of a CuBi binary alloy. Surprisingly, however, it starts to decrease at about 4 and becomes as little as 7 times smaller at 0.5. A similar tendency was also observed in anomalous Hall effects in the ternary alloys. We propose an explanation in terms of a simple model considering the relative dynamics between the localized moment and the conduction electron spin.
Wei, D. H.*; 新見 康洋*; Gu, B.; Ziman, T.*; 前川 禎通; 大谷 義近*
Nature Communications (Internet), 3, p.1058_1 - 1058_5, 2012/09
被引用回数：36 パーセンタイル：80.72(Multidisciplinary Sciences)The spin Hall effect (SHE) 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 SHE 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 (AHE), 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 SHE and the AHE, which reflects the first-order nonlinear fluctuations of local moments. Our finding opens up a new application of the SHE, by which a minuscule magnetic moment can be detected.
