Magnetostatic and magneto-optical properties of Co-based amorphous ribbons

We have investigated the modification of the magneto-optical and magnetostatic properties on weak-field-annealed Co-based amorphous ribbon with thermomagnetic treatment. It is found that magneto-optical spectra and hysteresis loops change with annealing time and field in air. This analysis clarifies that the asymmetric giant magnetoimpedance is related to the appearance of the surface microcrystalline phase