Abstract
The results of the effect of annealing on the giant magneto-impedance response of CoFeSiB amorphous wires and ribbons with nearly zero magnetostriction are reported. The most sensitive magneto-impedance response is given by amorphous wires in every case. Annealing reduces the magnitude of the magneto-impedance both for ribbons and wires, due to the alteration of the favorable transverse domain structure that exists in the as-cast samples. Annealing at more elevated temperatures tends to increase the magneto-impedance almost to its initial value for the as-cast samples, due to the stress relief accompanied by the improvement of soft magnetic properties.
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