Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1993-11-29

1996-08-27

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428408, 428432, 428678, 428694TS, 428694TP, 428694TC, 428694TF, 428694TM, 428695, 428900, G11B 566

Patent

active

055499791

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic base, an SiO.sub.x (x=1.2-1.95) undercoat, an under-layer ferromagnetic metal film consisting of a Co--Ni alloy, an SiO.sub.x (x=1.2-1.95) intermediate layer, an upper-layer ferromagnetic metal protective film consisting of a Co--Ni alloy, a diamond-like carbon protective film, and a lubricant layer, formed in the order of mention, the angles of vapor deposition as measured from lines normal to the upper- and under-layer ferromagnetic metal films being all decreasing toward the upper surfaces. The magnetic recording medium is made by forming an SiO.sub.x (x=1.2-1.95) undercoat by vapor deposition on a flexible nonmagnetic base being fed, forming an under-layer ferromagnetic metal film by vapor deposition of a Co--Ni alloy at a large deposition angle on the supply side and at a small deposition angle on the take up side, rewinding the semi-finished product thus obtained, repeating the foregoing process steps, forming a diamond-like carbon protective film, and further forming a lubricant layer over the diamond-like carbon protective film, all within a vacuum chamber.

REFERENCES:
patent: 4775576 (1988-10-01), Bouchoud
patent: 5055358 (1991-10-01), Tsuno
patent: 5110676 (1992-05-01), Murai et al.
patent: 5144134 (1992-09-01), Onodera et al.
patent: 5344706 (1994-09-01), Lambeth

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