針状BaCoXTiXFe12-2XO19微粒子の磁気特性

概要

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Acicular BaCoxTixFe12-2xO19 (X=O-1.0) particles and their coated films were prepared. The homogeneous mixtures of α-FeOOH, Ba(OH)2, Co acetylacetonate and Ti acetylacetonate were sintered at 900°C for 3 hrs and then quenched. The aspect ratio of about 10-15 didnt depend on the amount of the substitution, X. The corecive force linearly decreased with the increase of X. As the sample of X=0.7 had the coercive force of about 1 KOe, it is available for the present magnetic recording medium. The magnetization of these samples was unchanged with X until X=0.7. The mixture of the acicular particles of X=0.7, dispersing agent and binder resins was coated on the polyestel film in the magnetic field of 7 Be perpendicular to the film. It was confirmed that the long axis of the acicular particles was parallel to the base film by the TEN observation of the cross-section of the coated film. The magnetic anisotropy of acicular BaCoxTixFe12-2xO19 film is in the direction perpendicular to the film. The acicular hexagonal ferrite particles is applicable to a perpendicular magnetic recording medium.
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