Patent ID: 7399386
Filing Date: 2008-07-15
Classification: G11B

Abstract:
1. A method of manufacturing a magnetic recording medium comprising at least a non-magnetic underlayer, a magnetic layer, and a protective layer sequentially formed over a plastic substrate, comprising the steps of: forming an adhesive layer composed of a carbon film, having a chemical affinity to the plastic substrate formed on a surface of the plastic substrate, by sputtering carbon under presence of a mixed gas containing hydrogen gas or hydride gas; and forming the underlayer over the adhesive layer, wherein the carbon film has a polymer structure, and wherein the percentage of the hydrogen gas or the hydride gas in the mixed gas is equal to or higher than 25%, and wherein a value of (measured diffusing intensity)/(calibrated diffusing intensity) in a Raman spectrum of the carbon film is equal to or greater than 6.