Patent ID: 8048546
Filing Date: 2011-11-01
Classification: B82Y,G11B

Abstract:
1. A continuous-media perpendicular magnetic recording disk comprising: a substrate; an underlayer on the substrate; a ruthenium-containing layer on the underlayer and selected from a layer of ruthenium (Ru) and a layer of a Ru-based alloy, the upper surface of the Ru-containing layer having an ordered array of recesses having a depth greater than or equal to 5 Å and less than or equal to 20 Å, the depth of the recesses being less than the thickness of the Ru-containing layer; an oxide selected from an oxide of Si, Ta, Ti and Nb in said recesses; and a perpendicular magnetic recording layer on the Ru-containing layer and comprising a continuous layer of granular ferromagnetic Co alloy and an oxide the same as the selected oxide in said recesses of the Ru-containing layer, the Co alloy in the recording layer being in contact with the non-recessed regions of the upper surface of the Ru-containing layer and the oxide in the recording layer being in contact with the oxide in said recesses of the Ru-containing layer.