Effect of External Field on Spin-Glass Behavior of Fe₆₅(Ni_0.74Mn_0.26)₃₅ Alloy

Abstract

The AC susceptibility and the magnetization at various external fields of an Fe₆₅(Ni_0.74Mn_0.26)₃₅ alloy have been measured from 4.2 K up to 200 K. The AC susceptibility exhibits a sharp cusp around 60 K, while the magnetization curve shows a broad maximum around 60 K as well as an inflection point below the maximum point, which appears at a lower temperature with increasing external field. These behaviors are explained by a model in which ferromagnetic clusters are dispersed randomly in an antiferromagnetic matrix.