| 摘要 |
PROBLEM TO BE SOLVED: To obtain tabular magnetoplumbite type ferrite particles having a proper particle size, a low coercive force, a large saturation magnetization value, small in a coercive force distribution S, F, D, value and improved in temperature stability by forming the tabular magnetoplumbite type ferrite particles having a specific composition. SOLUTION: The tabular magnetoplumbite type ferrite particles have a composition of the formula: AO.n (Fe1-(a+b) Bia Mb )2 O3 } [A is Ba, Sr or Ba-Sr; M is Zn-Nb, Zn-Ta or Zn-Sn; (n) is 5.5-6.1; (a) is 0.001-0.005; (b) is 0.050-0.120; (b)/(a) is 20-50], a plate surface diameter of 0.30-1.50μm, a thickness of 0.05-0.60μm, a tabular ratio (plate surface diameter/thickness) of 3-7, a coercive force value of 300-1400Oe, a saturation magnetization value of >=560emu/g, a coercive force distribution S, F, D, of <=1.30 and temperature stability of -1.5 to +1.5Oe/ deg.C, preferably -1.2 to +1.2Oe/ deg.C. The coercive force value can efficiently be controlled by adjusting a small amount of M. |
