Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-03-15
2005-03-15
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S690000, C428S611000, C428S668000, C428S900000, C428S336000
Reexamination Certificate
active
06866948
ABSTRACT:
A magnetic recording medium based on the perpendicular recording system, which has high coercivity and low medium noise, is provided by using an underlayer which has a thin film thickness and which makes it possible to improve the orientation of a recording layer. The magnetic recording medium based on the perpendicular recording system has the recording layer which is formed of a CoPtCr alloy magnetic film containing oxygen. The magnetic recording medium has such a structure that an adhesive layer2, a soft magnetic back layer3, the underlayer4, the recording layer5, and a protective layer6are successively stacked on a substrate1. A CoCrRu film, which has a film thickness of 5 nm to 20 nm, is used as the underlayer for the recording layer formed of the CoPtCr alloy magnetic film containing oxygen. Thus, it is possible to improve the crystalline orientation of the recording layer with the underlayer having the thin film thickness.
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Yoshiyuki Hirayama et al.; “Low Noise Performance of CoCrPt Single-Layer Perpendicular Magnetic Recording Media.” IEEE Transactions on Magnetics, vol. 36, No. 5; Sep. 2000.
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Fujita Enji
Koda Tetsunori
Matsunuma Satoshi
Yamanaka Hideaki
Hitachi Maxell Ltd.
Oliff & Berridg,e PLC
Rickman Holly
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