Towards the investigation of the magnetization processes of uniaxial magnetic materials by means of the analysis of transformation of their domain structure: experiment and computer modeling

This paper presents the results of complex studies, including direct experiment and computer modeling, of the magnetization reversal processes of a SmCo ₅ single crystal and a (GdBiLu)₃(FeGa) ₅ O ₁₂ ferrite-garnet film. The analysis of images of the domain structure in the external magnetic field of both samples allowed us to construct the field dependences of magnetization. It was found that the field dependence of the magnetization of the ferrite-garnet film coincides with the magnetometry data. For the SmCo₅ single crystal the saturation field of the surface corresponds to the saturation field obtained from the measurements on a vibrating sample magnetometer, however, the view of the field dependence M(H) differs. Image analysis of the main domains of a single crystal in an external magnetic field and computer modeling have shown that the values of the domain structure disappearance fields on the surface of the film located above the single crystal are significantly less than the saturation fields according to magnetometry data. The application of an external magnetic field of 0,02 T leads to saturation of the entire volume of the ferrite-garnet film in the direction of the field, which does not allow further observation of the transformation of the main domain structure of the bulk sample and limits the applicability of the indicator film method.

ferrite-garnet film, single crystal, magnetic domain structure, Kerr effect, magnetization reversal processes