| 摘要 |
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 .mu.m 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. |
