Abstract
The mechanism for the abrupt increase in the giant magneto impedance (GMI) ratio in an ion-irradiated Co-based amorphous ribbon has been investigated. The GMI ratio is considerably increased in the ion-irradiated samples, and the GMI response shows a strong dependence on the driving frequency. For the Ar-ion-irradiated sample, the Barkhausen noise (BN) signals increases with increasing ion dose. The power spectrum density of the BN increases with increasing ion bombardment dose. The results are interpreted on the basis of radiation damage and domain wall dynamics.
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