Abstract
The field and temperature dependence of the magnetization of a ErFe5Al7 single crystal (tetragonal crystal structure of the ThMn12-type) has been studied in magnetic fields up to 14T. The compound is a ferrimagnet with Curie temperature TC=201K and a compensation point Tcomp=34K. ErFe5Al7 displays easy-plane anisotropy. Anisotropy is also present in the basal plane, the easy-magnetization direction is the [100] axis with the spontaneous magnetic moment Ms=1.28 μB/f.u. at T=2K. The compound exhibits field-induced magnetic transitions along the [100] and [110] axes. The transition along [100] is observed at T<40K and its critical field Hcr,100 displays complex non-monotonous temperature dependence. Along [110] magnetization jumps occur in a very narrow temperature interval T=31–40K. Hcr,110 is a very sharp function of temperature. Much higher fields are required to induce the transition at T<31K. At low temperatures strong hysteresis is observed, the coercivity is as high as Hc≈2.5T along the [100] and [110] axes at T=2K.
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