Investigation of the Magnetic Properties of Ferromagnets at Cryogenic Temperatures

A semi-automatic measuring complex for obtaining hysteresis loops of ferromagnetic materials at various magnetization reversal frequencies is considered. The complex is developed on the basis of the classical oscillographic method and allows you to significantly expand the possibilities of its application. It is possible to change the frequency of remagnetization of the sample. You can change the saturation depth of the sample. The saturation depth is limited only by the component base of the power amplifier. T he results of experiments on the study of the magnetic properties of samples of various materials at a temperature of +25°C and the boiling point of liquid nitrogen (-195.75°C) are presented. The following samples were selected: T2412 electric steel, amorphous iron GM42DS and GM43DS, permalloy 1k107, M2000NM ferrit. Hysteresis loops were removed at the different magnetization reversal frequencies. The obtained results demonstrate a significant temperature dependence of the magnetic parameters of the samples on temperature and frequency.