Abstract
Abstract—This work studies the effect of heat treatment on the magnetoimpedance (MI) effect of soft magnetic Co68.5Fe4Si15B12.5 amorphous ribbons prepared by melt quenching on a rotating wheel. It was found that after heat treatments at temperatures of 100°C and higher there occur irreversible changes of MI over a wide range of excitation ac frequencies. A change in the magnetoimpedance response to the action of elastic tensile stresses is shown to be related to the change in the sign of saturation magnetostriction coefficient (λS), which results from the heat treatment.
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