Effect of Magnetic Fluctuations on Spin Current.

Spin Hall effect (SHE) and its inverse enable the interconversion between charge current and spin current. It is widely recognized that the SHE occurs in a nonmagnetic material with strong spin–orbit interaction. However, it can be generated even in magnetic materials such as ferromagnets, antiferromagnets, and those mixtures, i.e., spin glass. Here we review the SHEs in two typical magnetic systems. One is the SHE in a weak ferromagnetic metal in the vicinity of the Curie temperature where a nonlinear magnetic susceptibility can be detected. The other is the SHE in a spin glass metal where fluctuations at the magnetic impurity sites can be measured electrically in a very sensitive way. We argue that the spin current could be utilized as a sensor to detect a small magnetic fluctuation. [ABSTRACT FROM AUTHOR]