Soft underlayer structure for magnetic recording

Details Soft underlayer structure for magnetic recording Soft underlayer structure for magnetic recording

2004-12-09

2008-05-27

Bernatz, Kevin M. (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S829000, C428S830000

Reexamination Certificate

active

07378164

ABSTRACT:
A magnetic recording medium having a soft magnetic underlayer structure that includes two soft underlayers is presented. A thick first soft underlayer, disposed on the medium substrate, is made of material which provides a low magnitude of magnetization saturation (Bsat) and high permeability. The first soft underlayer can be formed by plating or high-rate sputtering. The second soft underlayer, which has a lesser thickness than the first soft underlayer, is made of a material which provides a relatively high magnitude of Bsat and low permeability. The second soft underlayer can be formed by low-rate sputtering. The first soft under layer can be isolated from other layers in the medium by an exchange isolation layer. The second soft underlayer can be exchange coupled to a radial exchange pin layer disposed on the exchange isolation layer.

REFERENCES:
patent: 5270291 (1993-12-01), Sun et al.
patent: 5363794 (1994-11-01), Lairson et al.
patent: 5543221 (1996-08-01), Kitakami et al.
patent: 5603766 (1997-02-01), Visokay et al.
patent: 5822153 (1998-10-01), Lairson et al.
patent: 5834085 (1998-11-01), Lairson et al.
patent: 5909340 (1999-06-01), Lairson et al.
patent: 5942342 (1999-08-01), Hikosaka et al.
patent: 6645647 (2003-11-01), Litvinov et al.
patent: 6686070 (2004-02-01), Futamoto et al.
patent: 6890667 (2005-05-01), Lairson et al.
patent: 2002/0037439 (2002-03-01), Litvinov et al.
patent: 2002/0127433 (2002-09-01), Shimizu et al.
patent: 2002/0160230 (2002-10-01), Yoshikawa et al.
patent: 2003/0035973 (2003-02-01), Trindade et al.
patent: 61026927 (1986-02-01), None
patent: 10-228620 (1998-08-01), None
patent: 2001155322 (2001-06-01), None
Tsuboi et al. English Translation of JP 10-228620 A, PTO 04-2291.
JP Abstract Translation of JP 2001155322 A.
JP Abstract Translation of JP 10228620 A.
Machine Translation of JP 10228620 A.
JP Abstract Translation of JP 61026927 A.

Affiliated with

Also associated with

Rating

Soft underlayer structure for magnetic recording does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Soft underlayer structure for magnetic recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Soft underlayer structure for magnetic recording will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3983726