Abstract
A new method for measuring the magnetostriction constant has been developed. The resolution of this sensitive method allows to measure values of that constant as low as 10-9. It has been found that after thermal treatments, the magnetostriction constant of the amorphous ribbon whose nominal composition is Co58Fe5Ni10B16Si11 changes not only its absolute value but also its sign. The kinetics of this variation has also been studied and a mean value of the activation energy of 0.8 eV for the relaxation process was obtained. Such variations of the magnetostriction constant are discussed as produced by modifications of the short-range order during annealing.
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