Film type multi-layered magnetic recording medium and a...

Details Film type multi-layered magnetic recording medium and a... Film type multi-layered magnetic recording medium and a...

G - Physics

11

B

352/31

G11B 5/64 (2006.01) G11B 5/66 (2006.01) G11B 5/716 (2006.01) G11B 5/842 (2006.01)

Patent

CA 1228420

ABSTRACT OF THE DISCLOSURE A film type multi-layered magnetic recording medium comprised of a film coated on a substrate in which coated film needle-shaped magnetic grains are oriented with their longitudinal axes perpendicular to the film surface in a multi-layered state and having the film thickness of 1.1 to 2.0 times the average length of the grains, has an excellent property in that the angular ratios (Br/Bs) of both horizontal and the vertical components respectively are 0.6 or more. As a result, it is possible to realize the high density recording. The film type multi-layered magnetic recording medium of the present invention is manufactured by applying a fluid film formation material in which needle-shaped magnetic grains are dispersed to form a coated film having the thickness of 1.1 to 2.0 times the average length of the magnetic grains on a substrate, and then drying or hardening the film formation material in a magnetic field perpendicularly oriented toward the film surface.

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