Abstract
Magnetization measurements M(T,H,x) were performed on ferrimagnetic Ho6−xYxFe23H15 (x=0.47 and 0.92) compounds in the 4.2–700K temperature range (Curie temperature TC∼600K) in a magnetic field up to 55kOe. In comparison to parent alloys, absorption of hydrogen leads to a decreasing compensation temperature, a strong increase of the magnetic moments of the compounds in the 200–400K temperature range, and a higher Curie temperature. These results are analyzed within the frame of Herbst and Croat refined-Néel molecular field theory model, taking into account the increase of the iron magnetic moment and the weakening of the magnetic exchange coupling NHo–Fe as compared to their alloys values. The mean canting angle between rare earth and iron sublattices θ (θ⩽10°) is important for the yttrium-substituted compounds, particularly in the vicinity of compositions for which Tcomp∼0K.
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