MAGNETIC RECORDING MEDIUM AND METHOD FOR THE PRODUCTION THEREOF

摘要

An improved magnetic recording medium suitable fox a high density recording, which has a squareness ratio in vertical direction being 0.6 or more and an orientation ratio (squareness ratio in vertical direction/squareness ratio in lengthwise direction) being 0.7 or more and is prepared from acicular magnetic iron oxide particles having crystalline magnetic anisotropy and a ratio of Fe2+/Fe3+ of 0.05 or less wherein cobalt ion is uniformly doped, said particles having preferably a particle size of 0.3 .mu. or less and an axial ratio of 6 to 10, and a method for the production thereof.