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AssigneeHitachi Maxell, Ltd.
InventorsMasakazu Tani, Yoshiyuki Makita, Norihisa Yoshimoto, Kenichiro Yoshida
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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 magnetic layer has a thickness of 0.30 μm or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P1−P0) is 30 nm or less and (P1-P20) is 5 nm or less in which P0 is an averaged height of projections of the magnetic layer, and P1, P2, - - - and P20 are heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.
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 μm, the magnetic layer has a thickness of 0.30 μm or less and a centerline average surface roughness Ra of 3.2 nm or less, and a ratio of μmSL to μmSUS [(μmSL)/(μmSUS)] is from 0.7 to 1.3 and a ratio of μmSL to μBSUS [(μmSL)/(μBSUS)] is from 0.8 to 1.5, wherein μmSL is a coefficient of friction between said magnetic layer and a slider material, μmSUS is a coefficient of friction between said magnetic layer and stainless steel (SUS 304), and μBSUS is a coefficient of friction between the backcoat layer and stainless steel (SUS 304).
Dependencies are inferred from the claim text.