Tailoring the High-Frequency Giant Magnetoimpedance Effect of Amorphous Co-Rich Microwires

We studied the giant magnetoimpedance (GMI) effect and magnetic properties of amorphous Co-rich magnetic microwires prepared by the Taylor-Ulitovski technique. The magnetic field dependence of impedance and the magnetic anisotropy fields can be tailored through the magnetoelastic anisotropy by controllable change of the internal stresses. Co-rich microwires exhibit high (above 300%) GMI effect even at gigahertz frequencies. Features of the high-frequency GMI effect were analyzed using a ferromagnetic resonance-like approximation.