JPS6450237A - Production of perpendicular magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain large reproduction output by disposing a Co evaporation source and Cr evaporation source in the direction approximately orthogonal with the traveling direction of a nonmagnetic base at the time of forming a perpendicularly magnetized Co-Cr film. CONSTITUTION:The Co evaporation source 6 and the Cr evaporation source 7 are disposed in the direction approximately orthogonal with the traveling direction of the nonmagnetic base 1 at the time of forming the perpendicularly magnetized Co-Cr film on the long-sized nonmagnetic base 1 by a two-sources vapor deposition method while running the nonmagnetic base 1. The perpendicularly magnetized Co-Cr film to be formed is made of the compsn. which is consistent in the thickness direction of the magnetized film. The magnetic film having no change in the compsn. is thus formed. Since there is no change in the compsn. over the entire part of the magnetic film, the saturation magnetization Ms and coercive force Hc in the perpendicular direction can be uniformized in the thickness direction of the perpendicularly magnetized film. The large reproduction output is thereby obtd. as the entire part of the perpendicular magnetic film contributes to effectively to the reproduction output.