The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2014
Filed:
Feb. 20, 2013
Hgst Netherlands B.v., Amsterdam, NL;
Bruce Alvin Gurney, San Jose, CA (US);
Dan Saylor Kercher, Santa Cruz, CA (US);
Alan C Lam, San Jose, CA (US);
Ricardo Ruiz, Santa Clara, CA (US);
Manfred Ernst Schabes, Saratoga, CA (US);
Kentaro Takano, San Jose, CA (US);
Shi-Ling Chang Wang, San Ramon, CA (US);
Qing Zhu, Austin, TX (US);
HGST Netherlands B.V., Amsterdam, NL;
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.