  In this article, common experimental techniques and preparation conditions
adopted for the synthesis of M-type hexaferrites and their influence on the
magnetic properties are briefly reviewed. The effects of various strategies of
cationic substitutions on the properties of the hexaferrites are addressed.
Further, our synthesis and findings on Co-Ti substituted hexaferrites are
presented. It was found that Co-Ti substitution results in improving the
saturation magnetization, and reducing the coercivity down to values favorable
for high density magnetic recording. Also, evidence of inter-particle
interactions in the particulate samples was observed.
