High-field magnetisation studies on the Ho2(Co,Fe)17intermetallics

Abstract
High-field magnetisation measurements have been performed on single-crystalline samples of hexagonal Ho2Co17, Ho2Fe17 and Ho2Co14Fe3 in fields up to 40 T. In this field interval the magnetisation curves of Ho2Co17 and Ho2Co14Fe3 exhibit pronounced magnetic transitions in the hexagonal plane. The experimental data are analysed in a two-sublattice model. Within this analysis, the anisotropy constants, the sublattice magnetic moments and the 4f-3d exchange parameter are derived for the different compounds. In particular the 4f-3d exchange parameter can be determined accurately from the observed values for the transition fields.