Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-06-06
2006-06-06
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C427S131000, C204S192200
Reexamination Certificate
active
07056605
ABSTRACT:
A perpendicular magnetic recording medium has high recording density and excellent read-write characteristics. The recording medium has a magnetic layer of a multilayered lamination structure composed of laminated cobalt layers mainly containing cobalt and noble metal layers of platinum or palladium. At least one of the cobalt layers and the noble metal layers contains at least one element selected from the group consisting of Ru, Ta, Nb, Mo, Mn, Cr, Si, and Ni, or an oxide, in a concentration ranging from 1 to 15 mol %. The magnetic layer is formed on an underlayer of ruthenium or the like for reducing magnetic interaction between the magnetic particles in the magnetic layer. The surface of the underlayer is treated for oxygen adsorption before depositing the magnetic layer to suppress magnetic interaction between the magnetic particles in the magnetic layer.
REFERENCES:
patent: 5750270 (1998-05-01), Tang et al.
patent: 5834085 (1998-11-01), Lairson et al.
patent: 6596418 (2003-07-01), Maesaka et al.
patent: 6627301 (2003-09-01), Shimizu et al.
patent: 6656613 (2003-12-01), Litvinov et al.
patent: 6743503 (2004-06-01), Chen
patent: 2002/0076579 (2002-06-01), Hanawa et al.
patent: 2003/0175555 (2003-09-01), Usui
patent: 2001-155329 (2001-06-01), None
patent: 2002-25032 (2002-01-01), None
patent: 2002-203306 (2002-07-01), None
Relevant portion of Search Report and Written Opinion dated Apr. 29, 2005 from Australian Patent Office.
Fuji Electric & Co., Ltd.
Rickman Holly
Rossi Kimms & McDowell LLP
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