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AssigneeHitachi, Ltd.
InventorsHajime Fukke, Motoo Akagi, Iwao Matsuyama, Masayuki Katsumoto, Hitoshi Inoue, Naoki Kodama, Yasutaro Uesaka
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A method for manufacturing a magnetic paint by mixing a resin composition powder as a dispersing binder for a magnetic powder with the magnetic powder, or together with a filler, and grinding the mixture under a high shear stress is disclosed. A magnetic recording medium such as a magnetic disk, etc., prepared by using the magnetic paint, can have a magnetic coating film having a substantially uniform film thickness of not more than 0.9 .mu.m and a surface roughness of not more than 0.05 .mu.m Ra before surface finishing.
A magnetic recording hard disk which comprises a non-magnetic substrate and a magnetic coating film comprising magnetic powder and a binder and having a film thickness of 0.02 .mu.m to 0.2 .mu.m and a surface roughness of not more than 0.014 .mu.m Ra, provided on the non-magnetic substrate, the magnetic coating film being free from surface finishing for making the film thinner.
Dependencies are inferred from the claim text.