Perpendicular recording media with soft magnetic superlattice underlayer

Abstract

A low noise, high areal recording density, perpendicular magnetic recording medium, comprises: (a) a non-magnetic substrate having a surface with a layer stack formed thereon, the layer stack comprising, in overlying sequence from the substrate surface: (b) a soft magnetic underlayer comprised of a soft magnetic multilayer superlattice structure; and (c) a perpendicularly anisotropic, hard magnetic recording layer. Embodiments of the invention include providing the soft magnetic multilayer superlattice structure in the form of n stacked soft magnetic/non-magnetic layer pairs, where n is an integer between about 2 and about 9.

Dependencies are inferred from the claim text.