Magnetischer Aufzeichnungsträger

摘要

A magnetic recording medium comprising a nonmagnetic base, an SiOx (x = 1.2 SIMILAR 1.95) undercoat, an under-layer ferromagnetic metal film consisting of a Co-Ni alloy, an SiOx (x = 1.2 SIMILAR 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 SiOx (x = 1.2 SIMILAR 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.