On the magnetic hyperfine fields at nd impurities in Gd and Tb hosts

Abstract In this work we study the magnetic hyperfine fields at n d ( n =3, 4, 5) transition impurities diluted in ferromagnetic Gd and Tb hosts. The n d impurities are described within the Wolff–Clogston picture and the next-neighbor perturbation, due to the translational invariance breaking introduced by the impurity is also included in this work. The calculated hyperfine fields are in good agreement with the observed experimental data.