Method for making a perpendicular magnetic recording disk with template layer formed of nanoparticles embedded in a polymer material
US8821736B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2013 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Mar 15, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for making a perpendicular magnetic recording disk includes forming a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. The template layer is formed by depositing a solution of a polymer with a functional end group and nanoparticles, allowing the solution to dry, annealing the polymer layer to thereby form a polymer layer with embedded spaced-apart nanoparticles, and then etching the polymer layer to a depth sufficient to partially expose the nanoparticles so they protrude above the surface of the polymer layer. The protruding nanoparticles serve as 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.