SOFT MAGNETIC THIN FILM, MANUFACTURING METHOD THEREFOR, PERPENDICULAR MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORD REPRODUCING DEVICE
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United States of America Patent
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app pub date -
Oct 17, 2008
filing date -
Dec 16, 2004
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Abandoned
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Abstract
A soft magnetic thin film in which the recording magnetic field in the perpendicular direction can be preferentially intensified and sharply controlled when the thin film is applied to a perpendicular magnetic recording medium is provided. This soft magnetic thin film can be obtained by immersing a substrate into an electroless plating bath that contains a Co ion, Fe ion, and Ni ion as metal ions, as well as a completing agent and a boron-type reducing agent, wherein the content ratios of the metal ions on the mole basis are 0.15≦ (Ni ion amount/the amount of total metal ions) ≦0.40, 0.50≦ (Co ion amount/the amount of total metal ions) ≦0.80, and 0.05≦ (Fe ion amount/the amount of total metal ions) ≦0.15; and carrying out electroless plating in a magnetic field in a range of 5-2,000 Oe given in a direction parallel to the surface of said substrate.
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