Studies of Giant magnetoimpedance effect in soft magnetic microwires at GHz frequencies

Abstract

We studied Giant magnetoimpedance (GMI) effect and magnetic properties of various Co-rich amorphous microwires. We measured magnetic field dependences of the GMI ratio up to GHz frequency range and observed quite high GMI ratio in studied thin magnetic microwires even at GHz frequencies. We observed different values of the magnetic anisotropy field obtained from the hysteresis loops and the impedance curves. Observed dependences can be explained considering different magnetic anisotropy in the surface layers and in the inner part of metallic nucleus and skin depth effect. Features of high frequency GMI effect have been analyzed using FMR-like approximation.