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:
Apr. 29, 2003
Filed:
Mar. 12, 2001
David J. Sellmyer, Lincoln, NE (US);
Chunping Luo, Milpitas, NE (US);
Board of Regents of the University of Nebraska, Lincoln, NE (US);
Abstract
Disclosed is a modulated grain-composition magnetic recording material with up to terabit areal density recording capacity which, preferably, is produced by sequential vacuum deposition and subsequent annealing procedures that allow selective fabrication of magnetic material with desired grain size and coercivity, and with desired longitudinal or perpendicular magnetic particle “c-axis” orientation. The preferred magnetic recording material has multiple layers of FePt/B O and/or Fe/Pt/B O , with minimum grain size of approximately ten (10) nanometers, with perpendicularly oriented “c-axis”, and with coercivity (Hc) of up to twelve (12) K-Oe. The preferred fabrication procedure involves sequential sputter deposition of FePt and B O layers, followed by an anneal step.