Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-07-24
2007-07-24
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
10319842
ABSTRACT:
A magnetic recording medium exhibiting low noise and having a sufficiently high coercive force includes a magnetic layer having a granular structure including ferromagnetic crystal grains with a hexagonal closed packed structure and a nonmagnetic grain boundary region of mainly an oxide intervening between the crystal grains. An underlayer has a body-centered cubic lattice structure. A nonmagnetic intermediate layer with the hexagonal closest packed structure includes Ru, Os, and/or Re, which are provided between the magnetic layer and the underlayer. A degree of mismatching Δ=|d1−d2|/d1is at most 10%, for instance, in a range from 2.5% to 7.0%, where d1is a spacing of lattice planes of the crystal grains in the magnetic layer and d2is a spacing of the lattice planes of the crystal grains in the intermediate layer. A proportion of the crystal grains with a grain size of equal or greater than 8 nm are at most 10% of the crystal grains included in the intermediate layer and a standard deviation of the grain size is at most 1.4 nm. The layers are deposited without preheating the substrate.
REFERENCES:
patent: 5679473 (1997-10-01), Murayama et al.
patent: 5900323 (1999-05-01), Okamoto et al.
patent: 6110582 (2000-08-01), Wu et al.
patent: 6132863 (2000-10-01), Song et al.
patent: 6221481 (2001-04-01), Wu et al.
patent: 6767651 (2004-07-01), Uwazumi et al.
patent: 2001/0036564 (2001-11-01), Ohmori
patent: 2003/0157373 (2003-08-01), Kirino et al.
patent: 0704839 (1996-04-01), None
patent: 11-213371 (1999-08-01), None
patent: 2000-082210 (2000-03-01), None
patent: 2000-123345 (2000-04-01), None
U.S. Appl. No. 10/317,221, filed Dec. 12, 2002, Oikawa et al.
U.S. Appl. No. 10/324,105, filed Dec. 20, 2002, Iso et al.
Search Report and Witten Opinion issued by Singapore/Danish Patent and Trademark Office issued Aug. 30, 2004.
Nakamura Miyabi
Oikawa Tadaaki
Shimizu Takahiro
Takizawa Naoki
Uwazumi Hiroyuki
Fuji Electric Device Technology Co. Ltd.
Rickman Holly
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