High magnetic field properties of yttrium-substituted Ho_6Fe_(23) alloys and deuterides

摘要

The magnetic properties of the Ho_(6-x)Y_xFe_(23)D_z (x=0, 0.5, 1 and z=0, 16) deuterides and of the parent alloys are studied under high dc magnetic field (230 kOe) on samples oriented parallel and perpendicular to the external field in the 4.2-300 K temperature range. All compounds that retain the cubic Fm3m crystallographic structure present canted ferrimagnetic structure. For most of the samples, field-induced transitions characterized by a linear variation of M above the transition field are found. Upon deuteration drastic changes of the magnetic properties are observed and the main "magnetic parameters" are then determined. In the alloys the exchange interaction Ho-Fe increases when the yttrium content increases but decreases in the deuterides. For all alloys the Curie temperature remains close to 510 K.