Abstract
A commercially amorphous FeCoSiB wire was used for the magneto-impedance measurement. This effect includes a sensitive change (as much as 60%) in a high frequency wire voltage by an applied d.c. magnetic field and is thus a high frequency analogue of giant magneto-resistance. Some samples were annealed at a temperature slightly below its Curie point, and cooled in a transverse or longitudinal field. The frequency of the probe current was from 10 kHz to 10 MHz. At relatively low frequencies the magneto-impedance (MI) is mostly inductive, at relatively high frequencies it is resistive and a crossover could be defined at a characteristic frequency f 0. We have studied the variation of this frequency with annealed conditions, and we have found that for frequencies upward f 0 the MI effect is dominated by the skin depth effect.
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