| 摘要 |
PURPOSE:To obtain hexagonal based ferrite magnetic powder consisting of fine particles, having a specific composition as well as average particle diameter and suitable as high-density magnetic recording media. CONSTITUTION:Magnetic powder for magnetic recording having a composition formula expressed by the formula and 0.01-0.3mu average particle diameter. In the formula, (MI represents Ba, Sr, Ca or Pb; MII represents Mn, Zn, Mg or Al; MIII represents Si, Ge, Sn, Sb, Mo, W, V, Ni, Cu, Zr, P, Te, Bi, Cd or Ag; a, b, c, d, e, f and g each represent the numbers of atoms of Fe, Co, Ti, MI, MII, MIII and O; a represents 8-11.8; b and c represent 0.05-2.0; d represents 0.5-3.0; e and f represent 0.001-3.0; g represents the number of oxygen atoms satisfying the valence of other elements. This magnetic powder can be produced by, e.g. glass crystallization, coprecipitation, flux, hydrothermal methods, etc.
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