Flexible magnetic recording medium comprising an underlying film having reduced in-plane magnetic anisotropy under a surface film having perpendicular magnetic anisotropy

摘要

In a flexible magnetic recording medium comprising first and second films (11) and (12) successively formed on a substrate (10), the first film comprises an alloy of nickel and iron together with a magnetization adjusting component. An amount of the magnetization adjusting component is adjusted so that the first film has saturation magnetization less than or equal to 500 e.m.u./cc. The magnetization adjusting component may be either molybdenum or a combination of molybdenum and copper. The magnetization adjusting component may be between 12 and 50% by weight in the first film. Alternatively, the magnetization adjusting component may be titanium or silicon. The alloy may be Permalloy. The substrate may be a polyester film.