Current annealings and magnetoimpedance in Co-Fe amorphous ribbons

摘要

Amorphous ribbons of composition (Co_0.95Fe0.05)100-xSi0.4xB0.6x, with x = 25 and 30 were prepared by the melt-spinning technique. Current an- nealings at 600 mA were performed for annealing times between 15 s and 60 min. The magnetoimpednace response was investigated by submitting the ribbons to ac currents at frequencies in the 10-200 kHz range, with ampli- tudes between 1 and 15 mA (rms0, and measuring their voltage response.