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)Al 2 , MnO.Al 2 O 3 .SiO 2 , Cu-Mn, Co-Ga, Eu-Sr-S. Values of the mean zero field blocking temperature and the mean anisotropy field H K are deduced, the latter also by an independent method. The origins of H K are discussed.
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E.P. Wohlfarth (1980) studied this question.
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