| 摘要 |
PURPOSE:To obtain magnetic recording media with high saturated magnetic flux and residual magnetic flux density by precipitating electrolyticly a magnetic body metal in the fine thin hole of an anodized film charging the magnetic body in the fine thin hole and using a special nonsymmetrical alternating current as an electrolytic electric current. CONSTITUTION:&?When a magnetic body is charged to a fine thin hole by precipitating electrolyticly the magnetic body metal from a salt solution including a magnetic body metal in many fine thin holes of the anodized film of aluminum and aluminum alloy, a nonsymmetrical alternating current where the ratio A+/A- with + side peak electric current density A+ and - side peak electric current density A- is within the scope of 0.2-0.5, is used as an electrolytic electric current. When the value A+/A- is dislocated from the above-mentioned scope, a magnetic body charging ratio is lowered, the saturated magnetic flux density and the residual magnetic flux density are lowered, and as the result, a recording S/N, etc., are in danger of becoming worsen. It is desirable that the diameter DP of the fine thin hole of the anodized film is within the scope of 40nm-100nm. Thus, the saturated magnetic flux density is high and the magnetic body charging ratio is high.
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