Production of high-coercivity materials based on BaFe12O19 by crystallization of plasma-sputtered powders

Ferrite powders BaFe12O19 were studied in the present work after plasma heating and rapid quenching in differentenvironment: in air, in water and on the copper disk. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), vibration magnetometry (VSM) and Mossbauer spectroscopy (NGR) showed that the powder produced after quenching on the copper disk was in amorphous-crystalline state. The correlation between the annealing temperature and the value of magnetic parameters (coercive field and saturation magnetization) was established. Annealing at 1200 K for 2 h increases the coercive force up to 6.3 kOe. The processes of crystallization from the amorphous phase, that improve the magnetic properties of barium ferrite, are discussed. Highlights We studied the barium ferrite powdersafter plasma heating and rapid quenching. We studied the processes of crystallization from the amorphous phase. We studied theprocesses ofthermal annealing for the barium ferrite.