Abstract
The magnetic properties of a new metastable phase observed in (Nd, Pr)-Fe as-cast alloys are discussed. This phase has been reported to be amorphous or nanocrystaline. It is ferromagnetic with hard magnetic properties ( H c = 5 kOe) at room temperature). From the analysis of Mössbauer spectroscopy and magnetization measurements the chemical composition of this phase is deduced to be approximately Nd 31.25Fe 68.25. It is shown that the iron magnetic moment is higher than the value usually found in R-Fe alloys (R: rare earth) of similar compositions. The value of the activation volume in which magnetization reversal is developed is deduced from magnetic viscosity measurements from 50 to 300 K. It is shown that the anisotropy constant deduced from this volume is much higher then the one previously reported. This difference is ascribed to the differences in volume size over which the anisotropy constant is average depending on the type of phenomenon considered.
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