Abstract
The transition fields that recently have been observed in the basal-plane magnetisation curves of Ho 2Co 17 can successfully be described in a two-sublattice model and provide a direct method to evaluate the molecular field acting on the holmium moment. Its value of 63.5 T corresponds, in a molecular-field approximation, to a value of 0.924x10 -22 J for the coupling between the holmium and cobalt spins. The basal-plane magnetocrystalline anisotropy of the holmium moment is found to be 2.2x10 -22 J. On the basis of these numbers the molecular field acting on the rare-earth moment and the basal-plane anisotropy are calculated for the whole series of R 2Co 17 compounds.
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