Frequency and magnetic field dependence of the skin depth in co-rich soft magnetic microwires

Abstract

Tuneable metamaterials consisting of thin ferromagnetic wires exhibiting magnetoimpedance effect present tuneability of the effective permittivity by a weak magnetic field or a mechanical stress. Magnetoimpedance effect is related to magnetic field dependence of the skin depth of magnetic conductor. We studied giant magnetoimpedance (GMI) effect in magnetically soft amorphous Co-rich microwires in the extended frequency range. From obtained experimentally dependences of GMI ratio on magnetic field and different frequencies we estimated the penetration depth and its dependence on applied magnetic field and frequency.