Ferromagnetic resonance experiments in partially devitrified Co-based metallic glass

Abstract Properties of nanocrystalline magnets exhibiting low Curie temperature of the residual amorphous matrix, obtained by partial crystallization of Co–Nb–Cu–Si–B melt-spun ribbon, were studied by means of ferromagnetic resonance (FMR) as well as conventional magnetometry. The results acquired in FMR measurements, performed at the temperature ranging from 4.2 up to 300 K for a series of samples significantly differing in the volume fraction of the crystallites, allowed to characterize the temperature evolution of the properties of these two-phase magnets, in particular the effects occurring in the vicinity of the ferro- para-magnetic transition of the amorphous matrix. The critical temperature of this transition ranged from around 100 up to 140 K depending on the degree of divitrification.