Study of the structural and magnetic properties of ferrimagnetic materials under high-energy milling

The widespread use of ferrimagnetic materials necessitates the management and control of their functional characteristics, which can be modified by mechanical grinding in a ball mill. The aim of this study was to investigate the effect of high-energy milling on the structure and magnetic properties of ferrites. A barium hexaferrite (BaFe₁₂O₁₉) sample was analyzed using X-ray diffraction, BET, pulse magnetometry, and synchronous thermal analysis. It was found that milling leads to a decrease in the size of coherent scattering regions and an increase in microstrains in the ferrite material, which is accompanied by a decrease in its Curie temperature and saturation magnetization. Synchronous thermal analysis in a constant magnetic field showed that the temperature coordinates of the weighing step on the thermogravimetric curve can be used to estimate the size of the coherent scattering regions of the ferrimagnet. The identified patterns were formalized as regression models, allowing one to predict changes in the analyzed parameters depending on the grinding conditions. The obtained results can be used to improve the method for modifying the properties of magnetically hard ferrite materials using controlled grinding in ball mills.

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