Abstract
The influence of small additions of Cu and Nb into Fe-B amorphous materials on their crystallization process has been investigated by differential scanning calorimetry, X-ray diffraction and observations of hysteresis loops. The Fe 77B 19Cu 1Nb 3 alloy has been selected to analyze the correlation between structural changes during the crystallization process and the evolution of magnetic properties. It is shown that α-Fe nanocrystallites, with average grain size in the range 33-25 nm, are grown during the first crystallization step. At the same time, the coercivity increases from 2.4 A m -1 in the as-cast state to 80–120 A m -1 and an increase of the saturation magnetization of about 14% is observed. The appearance of the perpendicular magnetic anisotropy has also been observed. The sample overannealed is fully crystallized, Fe-B precipitates and the coercive field increases up to 2640 A m -1. The annealing process does not lead to a major magnetic softening, in the material investigated, as is the case for the iron-rich nanocrystals containing silicon. This fact is discussed in the present work in terms of the ferromagnetic exchange correlation length.
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