GIANT MAGNETOIMPEDANCE IN NONMAGNETOSTRICTIVE AMORPHOUS WIRES

The inductive voltage of a Co-based water-quenched amorphous wire has been measured as a function of applied axial dc field, tensile stress, and twisting, when an ac current flows through it. The results show that the giant ac magnetoresistance recently reported for nonmagnetostrictive amorphous wires is actually a giant magnetoimpedance (GMZ). The origin of GMZ in such wires is their large circular susceptibility at high frequencies, which is related to their small magnetostriction and special domain structure. © 1994 The American Physical Society.