Abstract
High field magnetization measurements (up to 38 T) were carried out at 4.2 K on “free powder” samples from Dy 2Fe 17− x Ga x ( x=5–8) compounds. The data were used to evaluate the microscopic exchange parameter, J DyFe. Its value was also obtained by mean-field analysis of Curie temperatures, T c, in agreement with the high-field data. The obtained results reveal an increase of J DyFe above x=6 that can be correlated with the observed change in T c vs. x for Dy 2Fe 17− x Ga x compounds and their counterparts with Y.
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