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Cold-rolling-induced changes in the activation energy spectrum of a metallic glass

Measurements of the relaxation of the magnetisation work have been performed in amorphous Fe40Ni40P14B6 ribbons, both as-quenched and after 4% thickness reduction by cold rolling. The results are analysed in the framework of an activation energy spectrum for the relaxation. The two energy zones present in the as-quenched sample are broadened by the cold rolling and, as a consequence of this, an increase in the number of low energy processes available for relaxation is produced.