Abstract
The magnetic properties and the structure of hydrogen-amorphized RFe 2H x compounds (R = Y, GdEr) have been studied. During hydrogen-induced amorphization (HIA) the structure of RFe 2 compounds is likely to be decomposed into the areas enriched in R, exchange-uncoupled with Fe, and those enriched in Fe. At least two exchange coupling constants differing by order of magnitude have to be assumed to describe the temperature dependence of the magnetization. From the magnetization measurements the characteristic size of the structural components is estimated to be of the order of a few nanometers. HIA causes noticeable increase of the Fe-magnetic moment and the FeFe exchange interaction, and a decrease of the R-Fe exchange interaction in comparison with analogous crystalline hydrides. The magnetic state of amorphous hydrides is non-uniform and for R = Tb…Er a canted magnetic structure in the R-sublattice is formed owing to a high local uniaxial anisotropy and a low R-Fe exchange interaction.
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