Magnetic recording medium and method for the production thereof

Details Magnetic recording medium and method for the production thereof Magnetic recording medium and method for the production thereof

G - Physics

11

B

31/149, 117/24.4

G11B 5/706 (2006.01)

Patent

CA 1194687

Abstract of the Disclosure: 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 direc- tion/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 µ or less and an axial ratio of 6 to 10, and a method for the production thereof.

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