The magnetic properties of alumite film in which CO-Fe alloy electrodeposited are investigated with regard to the alloy composition and the geometric structure of the magnetic films. The Co-Fe particles electrodeposited in the alumite film are single phase alloy particles. The CO-Fe alloy electrodeposited films with small pore diameter (150 A) have a large maximum magnetic energy product (BHmax) of about 1.44 MGOe due to the high coercive force, high saturation magnetization and good squareness of the M-H curve. Therefore the CO-Fe alloy electrodeposited film has good possibility for perpendicular magnetic recording media of magnetic rotary encoders.

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Abstract. .. The paper was investigated that the temperature and the pH of the Co solutions and the geometric structure of the films affects the orientation of the c-axis of the electro-deposited Co particle. That is, the coercive force Hc and the uniaxial magnetic anisotropy energy Ku variations are due to the change of the orientation of the c-axis and geometric structure of the Co particles in the Co electro-deposited anodic oxide films affected strongly the magnetocrystalline anisotropy of the films.It is shown that the magnetic properties of the Co electro deposited anodic oxide films can be changed in a wide range than Fe electro-deposited films decided by the geometric structure almost, because we can select and control both the Co solutions conditions and the geometric structure.

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Magnetic properties were measured for anodic oxide films containing electro-deposited iron or cobalt particles in pores. The coercive force perpendicular to films containing iron particles is in inverse proportion to the square of the particle diameter. For films containing cobalt particles, the magnetic crystalline anisotropy affects considerably on the coercive force