MORPHOLOGICAL, STRUCTURAL AND MAGNETIC CHARACTERISTICS OF CO-TI AND CO-SN SUBSTITUTED BA-FERRITE PARTICLES FOR MAGNETIC RECORDING

Co-Ti substituted barium ferrite particles were prepared by the glass-ceramic method in the BaCO3-B2O3-Fe2O3 glass system. The crystallization process of glass flakes, the morphology and magnetic properties of doped barium ferrite particles have been investigated. The finely divided, hexagonal plate-like Co-Ti and Co-Sn substituted barium ferrite particles were prepared by a method which combines the chemical coprecipitation process and the salt flux process. The formation process of these particles was investigated. The correlation between the magnetic properties, the particle morphology and the degrees of Co-Ti and Co-Sn substitutions of Ba-ferrite particles are studied. By the law of approach to saturation the effective anisotropy field H(A) and crystalline anisotropy constant K(l) were estimated. It was found that BaFe12-2x CoxSnxO19 with x = 1.10-1.40 have a very low temperature coefficient of coercivity at temperature range from 0 to 60-degrees-C and suitable magnetic characteristics for magnetic recording.