Magnetic media with improved exchange coupling

Details Magnetic media with improved exchange coupling Magnetic media with improved exchange coupling

2005-05-31

2005-05-31

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

C428S637000, C428S668000, C428S669000, C428S678000, C428S065100, C428S212000, C428S409000, C428S690000, C360S131000

Reexamination Certificate

active

06899959

ABSTRACT:
A magnetic recording medium includes a substrate, an underlayer, a lower magnetic layer formed on the underlayer, an intermediate layer, and an upper magnetic layer formed on the intermediate layer. The intermediate layer is typically Ru, and promotes antiferromagnetic coupling between the upper and lower magnetic layers. The upper and lower magnetic layers are typically Co alloys. The lower magnetic layer has a high saturation magnetization Ms to promote high exchange coupling between the upper and lower magnetic layers. The dynamic coercivity of the lower magnetic layer is lower than the exchange field to ensure rapid switching of the lower magnetic layer.

REFERENCES:
patent: 5051288 (1991-09-01), Ahlert et al.
patent: 5147732 (1992-09-01), Shiroishi et al.
patent: 5412809 (1995-05-01), Tam et al.
patent: 5580667 (1996-12-01), Lal et al.
patent: 5607740 (1997-03-01), Noda
patent: 5688380 (1997-11-01), Koike et al.
patent: 5693426 (1997-12-01), Lee et al.
patent: 5756202 (1998-05-01), Van Kesteren et al.
patent: 5834111 (1998-11-01), Lal et al.
patent: 5843569 (1998-12-01), Kaitsu et al.
patent: 5846648 (1998-12-01), Chen et al.
patent: 5851643 (1998-12-01), Honda et al.
patent: 5851656 (1998-12-01), Ohkubo
patent: 5898549 (1999-04-01), Gill
patent: 6077586 (2000-06-01), Bian et al.
patent: 6261681 (2001-07-01), Suekane et al.
patent: 6280813 (2001-08-01), Carey et al.
patent: 6456466 (2002-09-01), Nakamoto et al.
patent: 6537684 (2003-03-01), Doerner et al.
patent: 2001/0051287 (2001-12-01), Kikitsu et al.
patent: 2002/0039668 (2002-04-01), Inomata et al.
patent: 2002/0045069 (2002-04-01), Shinohara et al.
patent: 2002/0132140 (2002-09-01), Igarashi et al.
patent: 2003/0022023 (2003-01-01), Carey et al.
patent: 2003/0035973 (2003-02-01), Trindade et al.
patent: 2003/0104247 (2003-06-01), Girt
patent: 2003/0108776 (2003-06-01), Chang et al.
patent: 0 704 839 (1996-04-01), None
patent: 0892393 (1999-01-01), None
patent: 1059629 (2000-12-01), None
patent: 1059629 (2002-03-01), None
patent: 2355018 (2001-04-01), None
patent: 63-146219 (1998-06-01), None
patent: WO 96/24927 (1996-08-01), None
patent: WO 97/34295 (1997-09-01), None
Paper Titled “Preparation of Papers for 20th IEEE SOFE”.*
Richter, H., Wu, W., and Malmhall, R., IEEE Trans. Mag., 34(4), 1998, 1540-1542.*
Richter, H., and Girt, E., IEEE Trans. Mag., 37(4), 2001, 1441-1444.*
Parkin et al., “Oscillations in Exchange Coupling and Magnetoresistance in Metallic Superlattice Structures: Co/Ru, Co/Cr, and Fe/Cr”, Physical Review Letters, vol. 64, No. 19, May 7, 1990, pp. 2304-2307.
E.S. Murdock, et al., “Noise-Properties of Multilayered Co-alloy Magnetic Recording Media”, IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990, pp. 2700-2705.
Li-Lien Lee et al., “NiAl Underlayers for CoCrTa Magnetic Thin Films”, IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994, pp. 3951-3953.
Fullerton et al., “Antiferromagnetically Coupled Magnetic Media Layers for Thermally Stable High-Density Recording”, Applied Physics Letters, vol. 77, No. 23, Dec. 4, 2000.
Abarra et al., “Longitudinal Magnetic Recording Media with Thermal Stabilization Layers”, Applied Physics Letters, vol. 77, No. 16, Oct. 16, 2000.
Inomata et al., “Exchange Coupling Strength in Synthetic Ferrimagnetic Media”, IEEE Transactions on Magnetics, vol. 37, No. 4, Jul. 2001, pp. 1449-1351.
Abarra et al., “Synthetic Ferrimagnetic Media”, IEEE Transactions on Magnetics, vol. 37, No. 4, Jul. 2001, pp. 1426-1431.
Ramamurthy et al., “Advanced Media for Extremely High-Density Longitudinal Magnetic Recording”, Proceedings of 6thInternational Symposium on Magnetic Materials, Processes and Devices, Phoenix, Oct. 200.
Acharya et al., “Synthetic Ferrimagnetic Media for Over 100 Gb/in2Longitudinal Magnetic Recording”, Joint European Magnetism Symposia, Grenoble, France, Sep. 1, 2001.

Affiliated with

Also associated with

Rating

Magnetic media with improved exchange coupling 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 media with improved exchange coupling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic media with improved exchange coupling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3423011