Influence of Annealing on Magneto-Optical Properties of Fe$${}_{\mathbf{72.4}}$$Ti$${}_{\mathbf{5.4}}$$B$${}_{\mathbf{19.2}}$$O$${}_{\mathbf{3.0}}$$ Nanocrystalline Films

The results of the study on the magnetic properties of Fe $${}_{72.4}$$ Ti $${}_{5.4}$$ B $${}_{19.2}$$ O $${}_{3.0}$$ nanocrystalline films, subjected to annealing in vacuum at 200, 300, and 400 $${}^{\circ}$$ C, are presented. Films with a mixed (nanocrystalline $$+$$ amorphous) structure, 0.52 $$\mu$$ m thick, were obtained by magnetron deposition on glass substrates. Hysteresis loops were measured using a vibrating magnetometer, and the field and spectral dependences of the transverse Kerr effect (TKE) were determined. Magnetization reversal processes were visualized using a magneto-optical Kerr magnetometer. It was shown that the processes of partial crystallization of the initially amorphous phase and the redistribution of Ti and B within crystalline grains and grain boundaries, leading to the formation of new phases as a result of annealing, manifest themselves in a two-stage magnetization reversal process and in the modification of the TKE spectra.