Effect of annealing orientation on the giant magnetoimpedance in micro-patterned Co-based ribbon

Cobalt-based amorphous ribbons (Metglas® 2714A) were annealed treatment with an applied magnetic field. During annealing, the angle between the magnetic field axis and ribbon axis was designed for 0°, 30°, 60° and 90° respectively. MEMS technology was used to fabricate micro-patterned Co-based amorphous ribbons with a meander structure. The giant magnetoimpedance (GMI) effects were observed. The results showed magnetic field annealing treatment can improve the GMI ratio of the ribbon. With the increasing of the angle, the maximum GMI effect of the sample increased. When the angle was 90°, the maximum increment of GMI effect with 46.9 % was got.