Abstract
The reentrant spin glass study was elucidated for the first time by means of the novel method of neutron depolarization. The wavelength dependent neutron depolarization senses the magnetic induction in mesoscopic scale inside the magnetic material. It was demonstrat ed that the domain distribution in the ferromagnet could be determined by the careful depolarization study of the magnetization process. This method has been applied to the reentrant spin glass problem, and the observation of the mesoscopic magnetic field gives a significant experimental fact to evince the reentrant transition from the ferromagnetic order. The quite recent experiments are reviewed in this paper, which contains many new results from various metallic reentrant spin glasses. The reentrant behavior is concluded to be governed by the degree of the frustration.
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