Abstract
Physical causes of the formation of magnetic characteristics of cobalt-based alloys with a near to zero saturation magnetostriction under heat treatment in air have been studied using the Co–Fe–Ni–Cr–Si–B amorphous magnetically soft alloy as an example. The results of the study have shown the possibility of using the vapor treatment of surfaces of ribbons made of amorphous magnetically soft alloys to determine the sign of magnetostriction. The dependence of the sign of magnetostriction on the structural state of a ribbon, which is produced by the heat treatment, has been experimentally found. It has been established that physical causes of the formation of magnetic characteristics of the cobalt-based alloys are the same as those for iron-based alloys. Changes in the magnetic characteristics after annealing result from the relaxation of quenchinginduced internal stresses, as well as from the effect of stresses induced by hydrogen and oxygen atoms incorporated into the surface of the ribbon in the course of its interaction with water vapor in air and by the formation of an amorphous-crystalline surface layer.
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