Ferromagnetic resonance in partially crystallized Co–Nb–Cu–Si–B metallic glass

Magnetic properties of a series of two-phase nanocrystalline magnets differing in the volume fraction of the crystallites, produced by partial devitrification of the Co-based metallic glass exhibiting low Curie temperature, were studied using ferromagnetic resonance (FMR) technique. The measurements were carried out in a range of temperatures from 4 to 300 K. Changes in the FMR-spectra were observed at the temperatures close to the Curie points of the residual amorphous matrix (100–140 K, depending on the annealing temperature) being correlated with the temperature dependence of magnetization. Well defined resonance lines observed at low temperatures became much broader and complex in the range of higher temperatures. The latter effects were interpreted in terms of the anisotropy of the single-domain particles. The calculated effective magnetizations and the g-factor appeared to be quite reasonable.