Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-01-30
2007-01-30
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S832000
Reexamination Certificate
active
10705069
ABSTRACT:
A granular perpendicular magnetic recording medium having a surface treated magnetic layer comprising an oxidized or nitrogenized boundary layer formed on the surface of the magnetic layer, wherein the magnetic layer comprises granular magnetic regions having oxygen and/or nitrogen-containing grain boundaries. In one embodiment, the granular perpendicular recording medium further comprises a soft magnetic layer below the surface treated granular magnetic layer and a protective overcoat over the surface treated granular magnetic layer. A method of manufacturing a granular perpendicular magnetic recording medium includes depositing a magnetic layer having granular structure over a substrate and subsequently surface treating the granular magnetic layer in an oxygen and/or nitrogen-containing atmosphere to produce an oxidized and/or nitrogenized boundary layer formed on the surface of the granular magnetic layer. The granular perpendicular magnetic recording medium of the present invention exhibits high Hc and SNR while exhibiting improved corrosion resistance and contact start-stop performance.
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U.S. Appl. No. 60/475,834, entitled “In-situ Post-Deposition Oxidation Treatment for Improved Perpendicular Magnetic Recording Media”, by inventors Chung-Hee Chang and Charles F. Brucker, filed Jun. 3, 2003.
Chen Qixu
Harkness Samuel Dacke
Nolan Tom
Thangaraj Raj Nagappan
Wu Zhong (Stella)
Morrison & Foerster / LLP
Rickman Holly
Seagate Technology LLC
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