Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2008-02-13
2011-12-13
Bernatz, Kevin (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S828100, C428S829000, C360S135000
Reexamination Certificate
active
08076013
ABSTRACT:
A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20). The continuous film layer (24) has hard magnetic portions (204) formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer (20) and magnetic shield portions (202) formed between the hard magnetic portions (204), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.
REFERENCES:
patent: 6331364 (2001-12-01), Baglin et al.
patent: 6468670 (2002-10-01), Ikeda et al.
patent: 6579634 (2003-06-01), Saito
patent: 6660357 (2003-12-01), Litvinov et al.
patent: 7422808 (2008-09-01), Sugimoto et al.
patent: 7470474 (2008-12-01), Sakawaki et al.
patent: 7531249 (2009-05-01), Oikawa
patent: 7927725 (2011-04-01), Ishio et al.
patent: 2004/0191557 (2004-09-01), Kamata et al.
patent: 2005/0122609 (2005-06-01), Albrecht et al.
patent: 2006/0040140 (2006-02-01), Kaizu et al.
patent: 2006/0199043 (2006-09-01), Sugimoto et al.
patent: 2008/0292907 (2008-11-01), Berger et al.
patent: 2009/0166184 (2009-07-01), Zhou et al.
patent: 2009/0214895 (2009-08-01), Hinoue et al.
patent: 2010/0033872 (2010-02-01), Xi et al.
patent: 2001256630 (2001-09-01), None
patent: 2005-166238 (2005-06-01), None
patent: 2005-223177 (2005-08-01), None
patent: 2008-084432 (2008-04-01), None
patent: 141396 (2008-04-01), None
JOP Abstract Translation of JP 2001-256630 A (PAT-No. JP02001256630A). Patent published 2001.
Machine Translation of jP 2001-256630 A (Patent published 2001).
JP Abstract of JP 2007-273067 A (Pat-No. JP02007273067A, pub. Oct. 18, 2007).
Shingo Takahashi et al.; Grooved soft-underlayer for double-layered medium; Journal of Magnetism and Magnetic Materials 287 (2005), 260-264.
Search Report and Written Opinion dated Nov. 11, 2010, in Singapore Patent Application No. 200905355-4, 14 pages.
Onoue Takahiro
Sonobe Yoshiaki
Wago Koichi
Bernatz Kevin
WD Media (Singapore) Pte. Ltd.
LandOfFree
Magnetic recording medium, magnetic recording medium... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic recording medium, magnetic recording medium..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording medium, magnetic recording medium... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4315494