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:
Mar. 19, 2013
Filed:
Sep. 29, 2011
Olav Hellwig, San Jose, CA (US);
Jeffrey S. Lille, Sunnyvale, CA (US);
Andrew Thomas Mccallum, San Jose, CA (US);
Oleksandr Mosendz, San Jose, CA (US);
Dieter K. Weller, San Jose, CA (US);
Olav Hellwig, San Jose, CA (US);
Jeffrey S. Lille, Sunnyvale, CA (US);
Andrew Thomas McCallum, San Jose, CA (US);
Oleksandr Mosendz, San Jose, CA (US);
Dieter K. Weller, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A method for making a bit-patterned-media (BPM) magnetic recording disk includes depositing a FePt (or CoPt) alloy recording layer, and then depositing a sealing layer on the FePt layer before high-temperature annealing. The high-temperature annealing causes the FePt to become substantially chemically-ordered in the L1phase. After annealing, the sealing layer is removed. The sealing layer prevents nanoclustering and agglomeration of the FePt material at the surface of the FePt layer and the sealing layer, which would result in undesirable high surface roughness of the FePt, making patterning of the FePt layer difficult. The FePt layer can be patterned into the discrete islands for the BPM disk either before deposition of the sealing layer or after deposition and removal of the sealing layer. After patterning and removal of the sealing layer, the disk protective overcoat is deposited over the discrete data islands.