US 6,468,670 B1 · Magnetic recording disk with composite perpendicular recording layer

Abstract

A composite perpendicular magnetic recording disk has two distinct magnetic layers formed on the disk substrate, each with strong perpendicular magnetic anisotropy, that are strongly exchange coupled perpendicularly to each other across their interface. The first layer is a CoCr granular layer formed on a growth-enhancing sublayer, such as titanium, so as to have strong perpendicular magnetic anisotropy. The second layer is a continuous layer, preferably a continuous multilayer of Co/Pt or Co/Pd palladium formed on top of the granular layer. An interface layer, such as a layer of platinum or palladium, depending on whether the top multilayer is Co/Pt or Co/Pd, respectively, may be located between the two layers to enhance the growth of the continuous multilayer.

Claims19

Dependent claims

A perpendicular magnetic recording disk comprising:

a substrate having a substantially planar first surface;
a granular layer of an alloy comprising cobalt and chromium on said first surface, the granular layer having perpendicular magnetic anisotropy;
and
a continuous layer of material on said first surface in contact with the granular layer at an interface and having perpendicular magnetic anisotropy, the material of the continuous layer being exchange coupled perpendicularly with the granular layer at the interface between the granular layer and the continuous layer, the continuous layer comprising a multilayer of alternating first and second films, the first film consisting essentially of cobalt and the second film being selected from the group consisting of platinum and palladium.

1 more element

Dependencies are inferred from the claim text.

Magnetic recording disk with composite perpendicular recording layer

Life of this patent

Magnetic recording disk with composite perpendicular recording layer

Life of this patent

Abstract

Claims19