Barium ferrite particles for magnetic recording media.

摘要

Plate-like barium ferrite particles which have a BET specific surface area of 20 to 70 m<2>/g, an average particle diameter of 0.05 to 0.3 mu m, a magnetization of higher than 30 emu/g in a field of 7.96 x 10<5> A m<-><1> (10 kOe) and a coercive force of 2.39 x 10<4> to 7.96 x 10<4> A m<-><1> (300 to 1,000 Oe) and which are represented by the formula BaCoxTiyFe12-x-yO19 wherein x and y are independently numbers from 0.1 to 0.5, are useful as the magnetic material for magnetic recording media.