ABSTRACT
M-type hexagonal ferrites (BaFe12O19 and SrFe12O19) are known for their high uniaxial magnetocrystalline anisotropy with the easy axis of magnetization along the hexagonal c-axis and their chemical stability (Smit, 1961).These materials have been used in bulk form for many applications due to their hard magnetic properties, for example, as permanent magnets. In the last time, these ferrites have drawn a great interest for magnetic recording media (Simmons, 1989; Speliotis, 1989). Hexagonal ferrites show good chemical and thermal stability which would result in longer storage life of the media. Various techniques have been developed to prepare hexagonal ferrites powder with good recording characteristics. The application of hexagonal ferrites in the magnetic media industry requires materials with strict control of homogeneity, morphology and magnetic properties resulting from their preparation and heat treatments.
