Patent ID: 8962164
Filing Date: 2015-02-24
Classification: B82Y,G11B,H01F,Y10S,Y10T

Abstract:
1. A stack, comprising: a 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, each columnar-shaped magnetic grain comprising a plurality of sub-layers including: a first sub-layer having a first magnetic material, a thickness δ1, and a first magnetic anisotropy field H a second sub-layer adjacent to the first sub-layer, the second sub-layer having a second magnetic material, a thickness δ2, and a second magnetic anisotropy field H a third sub-layer adjacent to the second sub-layer and having a third magnetic material, a thickness δ3, and a third magnetic anisotropy field H