PURPOSE: To obtain a magnetic recording medium enhanced in lubricity and durability by applying a higher fatty acid on the surface of a thin ferromagnetic metal of Co or Co fine crystal alloy oxidized on the surface.
CONSTITUTION: The fine crystals 2 of Co or Co-Ni alloy or the like is formed on a nonmagnetic base 1 in the presence of a gas by the slant vapor deposition method or the like, and the oxide 3 of them is thinly formed on the crystals 2 to form a magnetic film 3. It is coated with an org. solvent soln. of a higher fatty acid to form a lubricant layer 4. After the coating, it is heat treated to combine it strongly with the oxide 3 on the fine crystals 2 and to enhance its lubricity to a higher degree. As a result, the obtained magnetic recording medium is freed of rise of noise under all the environmental conditions, and drop of output due to blocking, etc., and superior in durability.
SHINOHARA KOUICHI
FUJITA TAKASHI
SUZUKI TAKASHI
