| 摘要 |
PURPOSE:To obtain magnetic powder for vertical magnetic recording having a small average grain size, by preparing the magnetic powder, whose general composition formula is expressed by FeaTibSicMIdMIIeOf, and specifying the amounts of (a)-(f), which are the numbers of atoms of component elements. CONSTITUTION:This magnetic powder is expressed by a general formula FeaTibSicMIdMIIeOf. In this formula, MI represents at least one kind of a metal element, which is selected among Ba, Sr, Ca and Pb. MII represents at least one kind of a metal element, which is selected among La, V, Mo, W, Cd, Tl, P, Bi, Ce, Nd and Sm. (a), (b), (c), (d), (e) and (f) are the numbers of the atoms of Fe, Ti, Si, MI, MII and O. (a) has a value of 8-12, (b) has a value of 0.01-3.0, (c) has a value of 0.05-2.0, (d) has a value of 0.5-3.0 and (e) has a value of 0.01-3.0. (f) represents the number of oxygen atoms, which satisfies the valence of the other element. In this way, the magnetic powder for vertical magnetic recording having an average grain size of 0.1mum and the aligned grain sizes is obtained. |
