| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium structured to reduce low frequency noises and isolated spike noises and a substrate for achieving the same. SOLUTION: A soft magnetic film can be formed by a plating method on a substrate without an underlying plating film, such as an Ni or NiP alloy film by using a polycrystalline substrate as a silicon substrate. Since the underlying plating film is not provided, a remarkable spike noise reduction effect is obtained. A plated soft magnetic backing layer 102 having a thickness of 10 to 1,000 nm, a magnetic recording layer 103, a protective layer 104, and a lubrication layer 105 are successively laminated on the polycrystalline silicon substrate 102 of a diameter≤90 mm having a silicon oxide film 106 having a thickness of 10 to 1,000 nm in a main face, thereby forming the recording medium. In addition, a Pd-containing film 107 having a thickness of 1 to 200 nm may be formed between the silicon oxide film 106 and the soft magnetic backing layer 102. COPYRIGHT: (C)2008,JPO&INPIT
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