Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-02-22
2005-02-22
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S690000, C428S900000
Reexamination Certificate
active
06858330
ABSTRACT:
Disclosed are a double-layer perpendicular magnetic recording medium having a high medium S/N at a recording density of 50 Gbit or more per square inch and a magnetic storage apparatus with high reliability, which shows a low error rate. In the perpendicular magnetic recording medium in which a pre-coating layer, a soft magnetic underlayer, an intermediate layer, and a perpendicular recording layer are sequentially formed on a substrate, the soft magnetic underlayer contains Fe, Ta and C as main components, a Ta concentration is set to a range from 8 at % to 15 at % , and a ratio of a C concentration to the Ta concentration (C concentration/Ta concentration) is set to a range from 0.5 to 0.9.
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Honda et al., “Effect of Soft Magnetic Underlayer on Magnetization Microstructure of Perpendicular Thin Film Media”, Sep. 2000, IEEE Trans Magn, vol. 36, No. 5, pp. 2399-2401.*
Office Action dated Feb. 19, 2003 of the corresponding Japanese Patent Application 2000-401913 in which the above three references were cited (not translated).
Honda Yukio
Kikugawa Atsushi
Tanahashi Kiwamu
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
Rickman Holly
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