Magnetoimpedance of metallic ferromagnetic wires

The ac impedance Z=R+j omega L of a metallic soft magnetic wire with periodic circular domains relevant to domain-wall displacements is calculated and compared with the classical model relevant to domain magnetization rotations (DMR). It is shown that the magnetoimpedance (MI) defined as the relative change of \Z\ with a longitudinal de field H-dc at a fixed high frequency will have large values when the circular magnetization process is dominated by DMR. The single and double-peak \Z\ vs H-dc behaviors are explained and some experiments for studying MI of amorphous wires are proposed based on the model results. [S0163-1829(98)01417-9].