Abstract
We discuss the formation of the local magnetic moments and the related magnetic hyperfine fields at nd ( n = 3 , 4 , 5 ) transition impurities diluted in ferromagnetic Gd and Tb metals. The nd impurities are described within the Wolff–Clogston picture and the mean field approximation is adopted to deal with the Coulomb-like interaction. The next-neighbor tunneling, due to the translational invariance breaking introduced by the impurity, is also included in this work. Following a self-consistent procedure and using a criterious physical choice of parameters, we are able to calculate the local magnetization and magnetic hyperfine fields at the impurity sites. The calculated hyperfine fields are in good agreement with the experiments.
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