Abstract
Magnetic properties of Fe 76Si 10.5B 9.5Cu 1Nb 3 have been correlated to the structural evolution of this alloy upon heat treatment. The influence of isochronal annealing on the hysteresis loop has been analysed. The very beginning of nanocrystallization causes a slight magnetic hardening in the samples which will be overcome by the enhancement of the volume fraction of the Fe,Si crystallites. For further heat treatment, the appearance of boride-type phases provokes an abrupt magnetic hardening, whilst final recrystallization phenomena can hardly decrease coercivity. The evolution of the magnetic anisotropy distribution upon heat treatment has been explained in the light of the generalized random anisotropy model. The appearance of new origins of anisotropy (magnetocrystalline) and the development of new stresses in the sample by the emerging crystallites makes the magnetic anisotropy distribution shift to higher values and unfold in various maxima. In the range of crystallized volume fraction and grain size where Herzer's model is applicable, the distribution folds again and certainly resembles that of the relaxed amorphous due to the effective averaging of macroscopic magnetic anisotropy.
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