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Magnetic recording medium comprising a magnetic layer having specific thickness, surface roughness and friction coefficient

  • US 6,921,592 B2
  • Filed: 12/03/2003
  • Issued: 07/26/2005
  • Est. Priority Date: 10/31/2000
  • Status: Expired due to Term
First Claim
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1. A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the primer layer has a thickness of 0.3 to 3.0 μ

  • m, the magnetic layer has a thickness of 0.30 μ

    m or less and a centerline average surface roughness Ra of 3.2 nm or less, and a ratio of μ

    mSL to μ

    mSUS [(μ

    mSL)/(μ

    mSUS)] is from 0.7 to 1.3 and a ratio of μ

    mSL to μ

    BSUS [(μ

    mSL)/(μ

    BSUS)] is from 0.8 to 1.5, wherein μ

    mSL is a coefficient of friction between said magnetic layer and a slider material, μ

    mSUS is a coefficient of friction between said magnetic layer and stainless steel (SUS

         304), and μ

    BSUS is a coefficient of friction between the backcoat layer and stainless steel (SUS

         304).

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