The magnetic field dependence of the susceptibility peak of some spin glass materials

Abstract

The field dependence of the susceptibility of some spin glass materials is interpreted in terms of Neel's model of superparamagnetism, leading to a universal plot for the following substances: (La,Gd)Al2, MnO.Al2O3.SiO2, Cu-Mn, Co-Ga, Eu-Sr-S. Values of the mean zero field blocking temperature and the mean anisotropy field HK are deduced, the latter also by an independent method. The origins of HK are discussed.