Dynamic magnetic information storage or retrieval – Record medium – Disk
Reexamination Certificate
2006-08-15
2006-08-15
Korzuch, William (Department: 2653)
Dynamic magnetic information storage or retrieval
Record medium
Disk
C360S055000, C360S125020, C360S125330
Reexamination Certificate
active
07092209
ABSTRACT:
A method of longitudinal recording using a medium with a magnetically soft underlayer is described. The method includes lowering the longitudinal coercivity in a magnetic domain in the magnetic recording medium by generating a vertical component of magnetic flux in the magnetic recording medium and writing a longitudinal orientation in the magnetic domain in the magnetic recording medium by generating a larger horizontal component of magnetic flux in the magnetic recording medium using the write head. Optionally the method further includes magnetically saturating the magnetically soft underlayer after lowering the longitudinal coercivity to limit the vertical component of the magnetic flux. The recording medium has a magnetic recording layer, a spacer layer and a soft underlayer. In one embodiment the soft underlayer is an antiferromagnetically coupled magnetic layer stack with two soft magnetic layers separated by a non-magnetic spacer layer selected to achieve the antiferromagnetic coupling.
REFERENCES:
patent: 4949207 (1990-08-01), Lazzari
patent: 5140578 (1992-08-01), Tohkairin
patent: 5176965 (1993-01-01), Mallary
patent: 5750270 (1998-05-01), Tang et al.
patent: 5879783 (1999-03-01), Chang et al.
patent: 6280813 (2001-08-01), Carey et al.
patent: 6320725 (2001-11-01), Payne et al.
patent: 6495252 (2002-12-01), Richter et al.
patent: 6524730 (2003-02-01), Chen
patent: 6531202 (2003-03-01), Litvinov et al.
patent: 6583958 (2003-06-01), Suzuki et al.
patent: 6636371 (2003-10-01), Komatsu et al.
patent: 6709773 (2004-03-01), Chang et al.
patent: 6753072 (2004-06-01), Chen et al.
patent: 2001/0051288 (2001-12-01), Iwasaki et al.
patent: 2002/0149876 (2002-10-01), Sakata et al.
patent: 2003/0043490 (2003-03-01), Clinton et al.
patent: 2004/0234818 (2004-11-01), Tanahashi et al.
patent: 2004/0240107 (2004-12-01), Khizroev et al.
patent: 1378893 (2004-01-01), None
patent: 1533817 (2005-05-01), None
patent: 61198485 (1986-09-01), None
patent: 63152007 (1988-06-01), None
patent: 2005026451 (2005-01-01), None
patent: 2005302238 (2005-10-01), None
Hsiao Wen-chien David
Nikitin Vladimir R.
Polcyn Adam D.
Hitachi Global Storage Technologies - Netherlands B.V.
Kayrish Matthew
Knight G. Marlin
Korzuch William
LandOfFree
Longitudinal magnetic recording using magnetic media with a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Longitudinal magnetic recording using magnetic media with a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Longitudinal magnetic recording using magnetic media with a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3664736