Magnetic powders for magnetic recording media and magnetic...

Details Magnetic powders for magnetic recording media and magnetic... Magnetic powders for magnetic recording media and magnetic...

G - Physics

11

B

31/122, 117/24.4

G11B 5/706 (2006.01) H01F 1/11 (2006.01)

Patent

CA 1286100

ABSTRACT OF THE DISCLOSURE A magnetic powder of magnetic recording media comprises a hexagonal crystalline system magnetoplumbite type, ferrite represented by the formula: A1-XMXFe12-YQYO19 wherein A represents at least one of the elements selected from the group of Ba, Sr, Ca and Pb; Q represents at least one of the elements selected from the group of Ti, Co, Ni, Mn, Cu, Zn, In, Ge, Nb, Zr and Sb; M represents at least one of the rare earth elements selected from the group of Ce, Pr, Nd, Pm, Sm and Eu; and X represents an atomic ratio of the substitution between A and M. The magnetic powder has a mean particle size of 0.01 to 0.3 µm and a coercive force of 200 to 2000 Oe. The magnetic powder is improved in its saturation magnetization at a state where a proper or suitable coercive force is maintained. Accordingly, in a magnetic recording medium employing the magnetic powder, a high reproduction output may be obtained.

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