Patent ID: 6946166
Filing Date: 2005-09-20
Classification: G11B

Abstract:
1. The method of manufacturing a magnetic recording medium including a nonmagnetic substrate made of a polymer resin; an adhesive layer on the nonmagnetic substrate: a nonmagnetic undercoating layer above the adhesive layer; a magnetic layer above the nonmagnetic undercoating layer; a protection layer above the magnetic layer; and a liquid lubricant layer on the protection layer, the method comprising the steps of: irradiating a surface of the nonmagnetic substrate with plasma or ultraviolet ray so that carbony group concentration formed in the surface of the nonmagnetic substrate measured by X-ray photoelectron spectroscopic analysis is limited to 0.1 at. % to 30 at. % after the plasma or ultraviolet ray irradiatin to improve an adhesion characteristic thereof; and lower the B/A ratio of the adhesive layer, as measured by the Raman spectroscopic analysis, to 3 or higher; forming a carbon film as the adhesive layer on the nonmagnetic substrate; forming the nonmagnetic undercoating layer above the adhesive layer; forming the magnetic layer above the nonmagnetic undercoating layer; forming the protection layer above the magnetic layer; and forming the liquid lubricant layer on the protection layer.