MAGNETOIMPEDANCE OF METALLIC FERROMAGNETIC WIRES

The ac impedance Z=R+j omega L of a metallic soft magnetic wire with p eriodic circular domains relevant to domain-wall displacements is calc ulated and compared with the classical model relevant to domain magnet ization rotations (DMR). It is shown that the magnetoimpedance (MI) de fined 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 mag netization 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. [S0163-182 9(98)01417-9].