EFFECT OF ANNEALING ON THE GIANT MAGNETO-IMPEDANCE IN AMORPHOUS COFESIB RIBBONS AND WIRES

The results of the effect of annealing on the giant magneto-impedance response of CoFeSiB amorphous wires and ribbons with nearly zero magne tostriction are reported. The most sensitive magneto-impedance respons e is given by amorphous wires in every case. Annealing reduces the mag nitude of the magneto-impedance both for ribbons and wires, due to the alteration of the favorable transverse domain structure that exists i n the as-cast samples. Annealing at more elevated temperatures tends t o increase the magneto-impedance almost to its initial value for the a s-cast samples, due to the stress relief accompanied by the improvemen t of soft magnetic properties.