Patent ID: 8821736
Filing Date: 2014-09-02
Classification: G11B

Abstract:
1. A method for making a perpendicular magnetic recording disk comprising: providing a substrate; depositing on the substrate a solution of a polymer with a functional end group and a plurality of nanoparticles; allowing the solution to dry, thereby forming a polymer layer with embedded spaced-apart nanoparticles; etching the polymer layer to a depth sufficient to partially expose the nanoparticles; depositing a seed layer over the etched polymer layer and the partially exposed nanoparticles; depositing an underlayer selected from Ru and a Ru alloy on the seed layer; and depositing a perpendicular magnetic recording layer on the underlayer, the recording layer comprising a layer of granular ferromagnetic Co alloy and one or more oxides of one or more of Si, Ta, Ti Nb, B, C, and W.