Patent ID: 8048545
Filing Date: 2011-11-01
Classification: B82Y,G11B,H01F,Y10S,Y10T

Abstract:
1. A magnetic recording medium, comprising: a non-magnetic substrate having at least one surface; and a layer stack on the surface of said substrate, the layer stack including a perpendicular recording layer comprising a plurality of columnar-shaped magnetic grains extending perpendicularly between opposing surfaces of the recording layer, wherein each columnar-shaped magnetic grain comprises a plurality of sub-layers including first and second sub-layers with different magnetic compositions, wherein the first sub-layer is positioned at a first end of each of the columnar-shaped magnetic grains and comprises a first magnetic material that includes CoCrX the second sub-layer is positioned at a second end of each of the columnar-shaped magnetic grain and comprises a second magnetic material that includes CoX the total thickness δ