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:
Jun. 08, 2010
Filed:
Nov. 10, 2006
Eric Edward Fullerton, Morgan Hill, CA (US);
Olav Hellwig, San Jose, CA (US);
Jeffrey S. Lille, Sunnyvale, CA (US);
James Terrence Olson, Santa Cruz, CA (US);
Petrus Antonius Vanderheijden, San Jose, CA (US);
Henry Hung Yang, San Jose, CA (US);
Eric Edward Fullerton, Morgan Hill, CA (US);
Olav Hellwig, San Jose, CA (US);
Jeffrey S. Lille, Sunnyvale, CA (US);
James Terrence Olson, Santa Cruz, CA (US);
Petrus Antonius VanDerHeijden, San Jose, CA (US);
Henry Hung Yang, San Jose, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A patterned perpendicular magnetic recording medium of the type that has spaced-apart pillars with magnetic material on their ends and with nonmagnetic trenches between the pillars is made with a method that allows use of a pre-etched substrate. The substrate has a generally planar surface at the trenches and comprises material that when heated will diffuse into the magnetic recording layer material and chemically react with one or more of the elements typically used in the recording layer. The pillars are formed of material that will not diffuse into the recording layer. After the recording layer is formed over the entire substrate so as to cover both the pillar ends and the trenches, the substrate is annealed. This results in the destruction or at least substantial reduction of any ferromagnetism in the recording layer material in the trenches so that the trenches are nonmagnetic. The annealing does not affect the recording layer on the ends of the pillars because the pillars are formed of material that will not diffuse into the recording layer.