Diameter influence on magnetoimpedance of Co-based glass-covered amorphous wires

Abstract

The aim of this work is to show the dependence on geometrical parameters of magnetoimpedance (MI) of amorphous wires. The samples used are Co-based glass-covered amorphous wires with metallic diameter of about 0.055, 0.100 and 0.150 mm and total diameter of 0.065, 0.130 and 0.200 mm, respectively. A decrease in the MI ratio is observed when the diameter decreases due to the skin effect as a consequence of the higher ratio between diameter and penetration depth. It is also important to note that the maximum observed value of MI ratio is displaced to higher frequencies when the diameter of the sample is reduced.