| 摘要 |
PURPOSE:To improve S/N of a magnetic recording medium itself by specifying the bulk density of hexagonal crystal ferrite magnetic powder containing specific composition. CONSTITUTION:Hexagonal crystal ferrite magnetic powder represented by AO.n(Fe1-xMx)2O3 (where A is at least one type of element selected from Ba, Sr, Ca and Pb, M is at least one type of element selected from CO, Ti, In, Ni, Cu, Zn, Nb, Zr, V, Ta, Cr, Sb, Hf, MO, W, Ir, Sn and Mg, and n is a number of 5.0-6.5, and x is a number of 0.02-0.24) has 0.8-1.5g/cm<3> of bulk density. Thus, since the bulk density is set relatively high, it is easy to enhance the filling density of magnetic powder in a high density recording medium to be formed. Accordingly, as the filling density of the powder is improved, S/N (output) of the medium is improved. |
