| 摘要 |
PURPOSE:To stabilize the dispersion of magnetic particles and to improve the packing density of the particles by allowing hexagonal ferromagnetic particles to be present in the magnetic layer as a unit aggregate obtained by laminating the particles in the direction of an axis easy for magnetization. CONSTITUTION:Hexagonal ferromagnetic particles 11 are washed with water and a surfactant and a dispersant are added to the particles. Then the hexagonal ferromagnetic particles 11 are laminated in the direction of the axis 12 easy for magnetization by mixing and gioing impact to form a unit aggregate 13. The aggregate 13 is then specifically treated and blended into a paint, which is coated on a film in 1-5mum thickness to form a magnetic recording medium. The dispersibility of the ferromagnetic particles is stabilized by the presence of the unit aggregate 13 obtained by laminating the particles in the direction of the axis easy for magnetization the packing density is increased, hence the coercive force is increased by 20-40% and a recording medium having excellent recording and reproducing outputs can be obtained.
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