PERPENDICULAR MAGNETIC RECORDING DISK WITH TEMPLATE LAYER FORMED OF NANOPARTICLES EMBEDDED IN A POLYMER MATERIAL

摘要

A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.

主权项

1. A perpendicular magnetic recording disk comprising:
a substrate; a template layer on the substrate, the template layer comprising nanoparticles spaced-apart by and embedded within a polymer material, the nanoparticles providing protrusion features at the surface of the polymer material; a seed layer covering the polymer material and the nanoparticles; an underlayer selected from Ru and a Ru alloy on the seed layer; and a perpendicular magnetic recording layer on the underlayer and 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.