Study of the phase composition, structural and magnetic properties of M−type hexaferrites produced by self-propagation high-temperature synthesis

Abstract

In this work, BaFe₁₂O₁₉ hexaferrites were synthesized by self-propagating high-temperature synthesis (SHS). The ferritization temperature of SHS products has a significant effect on the content of the target M−type phase of hexaferrites. Magnetic hysteresis loops in pulsed magnetic fields up to 26 kOe were studied. It was shown that with an increase in the ferritization temperature of hexaferrites from 1000 °C to 1200 °C, the values of the coercive force and specific saturation magnetization increase due to an increase in the M−phase content and crystallite growth. The magnetization curves for hexaferrites with a high content of the M−phase were calculated. The contribution of the paraprocess to the magnitude of the specific saturation magnetization was determined. The fields of magnetocrystalline anisotropy, the values of the effective gyromagnetic ratio and the damping factors in the Landau-Lifshitz-Gilbert equation were determined by the ferromagnetic resonance method.