Multilayer-based magnetic media with hard ferromagnetic, anti-ferromagnetic, and soft ferromagnetic layers

摘要

A 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 ferromagnetic keeper or underlayer;;(c) an anti-ferromagnetic coupling layer structure; and;(d) a hard ferromagnetic perpendicular recording layer including a multilayer magnetic superlattice structure;;wherein layers (b), (c), and (d) in stacked combination provide the medium with improved thermal stability and a high perpendicular coercivity which can exceed about 6,500 Oe.