CHANGE IN MAGNETIC-PROPERTIES WITH ANNEALING OF A COLD-ROLLED AMORPHOUS FE79B16SI5 ALLOY

The effect of annealing on magnetic properties of a cold-rolled Fe79B1 6Si5 amorphous ribbon has been examined to find a way to improve the d eformation-induced degradation of soft magnetic properties. Annealing between the Curie temperature and the crystallization temperature is v ery effective to improve the deteriorated magnetic properties of the 1 0% cold-rolled ribbon. After annealing between these temperatures for a few minutes, the shape of the hysteresis curve reverts to that prior to cold-rolling. During subsequent anneals, the change in the curve o f the cold-rolled ribbon is nearly identical with that of the as-quenc hed ribbon. The activation energy spectrum characterizing the recovery process has been calculated by using the activation energy spectrum ( AES) model. The resultant spectrum revealed two peaks. This indicates that two distinct relaxation mechanisms are involved in the process.