Power absorption and ferromagnetic resonance in Co-rich metallic glasses

The power absorption of Go-rich metallic glasses in the shape of ribbons an d microwires has been measured in the microwave frequency range. The techni que employed consists of replacing the dielectric of a coaxial transmission line by the amorphous sample to be measured. The ferromagnetic resonance f requency of the microwires has been obtained by analyzing the absorbed powe r as a function of an external magnetic held. From the evolution of this re sonance frequency, the anisotropy field has been deduced and successfully c ompared to that obtained from low-frequency hysteresis loops.