ABSTRACT
In 1952, the Phillips Laboratory, J.J. Went et al., developed the BaFe12O19 barium ferrite (Went J.J., Rathenau G.W. and Gorter E.W. 1952). In 1954, production technology of the anisotropic barium ferrite came out making energy product have increased significantly. In 1963, high-performance strontium ferrite started producing (R.C. Pullar 2012). SrFe12O19 strontium ferrite is one of them. SrFe12O19 strontium ferrite is a high-performance permanent magnet material and has high coercivity, Curie temperature, magnetic crystal magnetic anisotropy, excellent chemical stability and a low price of the raw materials. It is widely used in the field of permanent magnet components, microwave communications and high-density, magnetooptical element perpendicular magnetic recording elements and absorbing materials (Hong Y.S. 2004, Mali A. 2005, Vijayalakshmi A. 1998 and Liver S. 2000). In 2009, C. Wang et al., prepared stable ferroelectric ferromagnetic composites by cladding BaFe12O19 with different amounts of BaTiO3. This indicates that M-type ferrite can be used in the field of ferroelectric ferromagnetic composites (Kishan Reddy N. and Mulay V. N. 2002).
