Abstract
The field response of impedance is studied in a stress-annealed amorphous ribbon as a function of the angle of application of the external magnetic field in order to verify the role of induced anisotropies (and their distribution) and demagnetizing factors in the giant magnetoimpedance (GMI) phenomenon which occurs in soft magnetic materials. The experimental results are well explained by a theoretical model, based on the simultaneous solution of Maxwell equations and the Landau-Lifshitz equation of motion. Demagnetizing effects are properly taken into account in the case of ribbons or thin films. The physical parameters necessary to test the theory were obtained through complementary measurements of the ferromagnetic resonance and temperature dependence of magnetization. The results clearly indicate the enormous influence of the distribution of anisotropies on the GMI effect. Also, an experimental procedure for determining the easy-axis distribution function is proposed.
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