PURPOSE: To improve running property and durability without spoiling the corrosion preventive effect of a thin ferromagnetic metallic film by a plasma- polymerized film layer by forming the thin plasma-polymerized film layer of an org. compd. on the thin ferromagnetic metallic film layer and forming a graft-polymerized layer to the thin plasma-polymerized film layer.
CONSTITUTION: The thin ferromagnetic metallic film consisting of a prescribed metal or alloy is formed on a substrate 5 and the plasma-polymerized protective film layer 1 of the org. compd. is formed thereon; thereafter, the protective layer is exposed to a gaseous monomer of the vinyl deriv. expressed by the general formula CH2=CHX or the vinyli dene deriv. expressed by CH2=CXX', by which the graft-polymerized layer 4 consisting of the plasma-polymerized film layer as a backbone polymer is formed. The magnetic recording medium having excellent corrosion resistance, running property and durability is thus obtd.
KOMI FUMIO
KUBOTA TAKASHI
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