Magnetic recording medium, method of manufacturing the same and magnetic recording apparatus
AssigneeFuji Electric Device Technology Co., Ltd.
InventorsAkira Iso, Makoto Isozaki
Life of this patent
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Abstract
A magnetic recording medium using a plastic substrate as a non-magnetic substrate includes an adhesive layer that prevents film expansion even under severe conditions. The adhesive layer has a chemical affinity to the plastic substrate and is formed on the surface of the plastic substrate, and an underlayer and subsequent layers are formed over the adhesive layer. A polymerized carbon film is used as the adhesive layer.
Claims3
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.
Dependencies are inferred from the claim text.