MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To improve the adhesion property with a magnetic material as well as the magnetic characteristics by adding Si when a DLC film is formed as a protective film or lubricating film on a magnetic recording medium. SOLUTION: A PET(polyethylene terephthalate) film 11 of 7μm thickness is used as a supporting substrate. The center line average roughness (Ra) of the substrate surface is 3μm. The substrate is supplied in a form of a roll having 400 mm width. Before a DLC film is formed, a magnetic film 12 is preliminarily formed. The magnetic film 12 comprises of a CoNi alloy and is formed to 200nm thickness by vacuum vapor deposition. Then a DLC film 13 is formed while changing the thickness between 10 and 50nm thickness on the magnetic film 12.