Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2007-11-20
2007-11-20
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S059000, C428S836000
Reexamination Certificate
active
10679696
ABSTRACT:
A magnetic recording medium includes: an underlayer constituted of at least a substrate and a nonmagnetic metal element; and an amorphous magnetic layer, made of amorphous magnetic material, which magnetically records information. In certain example embodiments, the amorphous magnetic layer has bumps on a surface thereof or the magnetic recording medium has bumps on a surface thereof (surface of a lubricating layer) so that density of the bumps is not less than 400 bumps/μm2or so that height of the bumps is not less than 2% with respect to an average layer thickness of the amorphous magnetic layer. Thus, magnetic wall movement of the amorphous magnetic layer is effectively suppressed, so that it is possible to stably form a recording bit.
REFERENCES:
patent: 4688130 (1987-08-01), Nakanouchi et al.
patent: 4734810 (1988-03-01), Nakayama et al.
patent: 5093173 (1992-03-01), Nakagawa et al.
patent: 5656385 (1997-08-01), Nakajima et al.
patent: 5843561 (1998-12-01), Uwazumi et al.
patent: 5846648 (1998-12-01), Chen et al.
patent: 5908683 (1999-06-01), Suzuki et al.
patent: 5914168 (1999-06-01), Wakamatsu et al.
patent: 5939170 (1999-08-01), Nishimori et al.
patent: 5949612 (1999-09-01), Gudeman et al.
patent: 6017605 (2000-01-01), Yamazaki et al.
patent: 6096445 (2000-08-01), Terakado et al.
patent: 6153284 (2000-11-01), Gui et al.
patent: 6183892 (2001-02-01), Saiki et al.
patent: 6203884 (2001-03-01), Sato et al.
patent: 6303205 (2001-10-01), Tanaka et al.
patent: 6372367 (2002-04-01), Matsuda et al.
patent: 6472049 (2002-10-01), Song et al.
patent: 6519114 (2003-02-01), Wang et al.
patent: 6753064 (2004-06-01), Nakama et al.
patent: 6804822 (2004-10-01), Sato et al.
patent: 6819531 (2004-11-01), Shiroishi
patent: 2002/0060979 (2002-05-01), Tsukuda et al.
patent: 2002/0081461 (2002-06-01), Nishikawa et al.
patent: 2002/0186506 (2002-12-01), Sato et al.
patent: 2003/0157373 (2003-08-01), Kirino et al.
patent: 2004/0120062 (2004-06-01), Yip et al.
patent: 61-240429 (1986-10-01), None
patent: 5-282648 (1993-10-01), None
patent: 07-192260 (1995-07-01), None
patent: 08-263836 (1996-10-01), None
patent: 2000-207722 (2000-07-01), None
patent: 2002-83417 (2002-03-01), None
Ozaki et al, “TbFeCo as a Perpendicular Magnetic Recording Material”, Journal of the Magnetics Society of Japan, vol. 25, No. 3-2, 2001, pp. 322-327.
Katayama et al, “Effect of Underlayers of Laser-Assisted Magnetic Recording Media on High-Density Recording”, American Institute of Physics, Applied Physics Letters, vol. 81, No. 26, Dec. 23, 2002, pp. 4994-4996.
Fuji Hiroshi
Sato Jun-ichi
Mercedes Dismery
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
Wellington Andrea
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