Vertical recording medium with thin soft magnetic film

Abstract

A vertical magnetic recording medium includes a soft magnetic film formed on a substrate, and a vertical magnetization film formed on the soft magnetic film. μ·δb≧=1000, when μ is a permeability of the soft magnetic film, and δb [nm] is a film thickness of the soft magnetic film. The permeability μ of the soft magnetic film is 5≦μ≦200, and the film thickness δb of the soft magnetic film is equal to or less than 500 nm. Also, vertical magnetic anisotropy energy Ku [erg/cc] of the vertical magnetization film is 1×107≦Ku≦7×108, and coercive force Hc [kOe] of the vertical magnetization film in the vertical direction to a surface of the vertical magnetization film is 5≦Hc≦10.

Dependencies are inferred from the claim text.