JPS6482326A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain excellent wear resistance and magnetic characteristics by projecting the evaporating particles of a ferromagnetic material onto a substrate surface at a specific angle with the normal of the substrate surface, thereby forming a thin ferromagnetic metallic film layer. CONSTITUTION:The max. incident angle of the evaporating particles 10a of the ferromagnetic material is specified to 60 deg. and the min. incident angle thereof to 30 deg. at the time of forming the thin ferromagnetic metallic film layer on the substrate surface by a continuous diagonal vapor deposition method. The axis of easy magnetization of the formed thin ferromagnetic metallic film layer is then approximately paralleled with the normal of the substrate 4 surface so that the self-demagnetization effect is hardly received at the time of short wavelength recording. The influence of the self-demagnetization effect is received if the film thickness of the thin ferromagnetic metallic film layer is smaller than 1,500Angstrom and the reproduced output decreases if the thickness is larger than 3,000Angstrom . The thickness is, therefore, confined in a 1,500Angstrom -3,000Angstrom range. The magnetic recording medium having the excellent wear resistance and magnetic characteristics is thereby obtd. while the diagonally vapor deposited magnetic film is used.