Perpendicular magnetic recording medium with laminated...

Details Perpendicular magnetic recording medium with laminated... Perpendicular magnetic recording medium with laminated...

2006-04-12

2009-02-10

Rickman, Holly (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

07488545

ABSTRACT:
A laminated perpendicular magnetic recording medium has two recording layers (RL1and RL2) that are separated and magnetically decoupled by a nonmagnetic spacer layer (SL). The SL has a thickness and composition to assure there is no antiferromagnetic or ferromagnetic coupling between RL1and RL2. Thus in the presence of the write field, RL1and RL2respond independently and become oriented with the direction of the write field. Each RL is an “exchange-spring” type magnetic recording layer formed of two ferromagnetic layers (MAG1and MAG2) that have substantially perpendicular magnetic anisotropy and are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagnetic coupling layer (CL). The medium takes advantage of lamination to attain higher signal-to-noise ratio (SNR) yet has improved writability as a result of each RL being an exchange-spring type RL.

REFERENCES:
patent: 5051288 (1991-09-01), Ahlert et al.
patent: 5534355 (1996-07-01), Okuno et al.
patent: 5756202 (1998-05-01), Van Kesteren et al.
patent: 6007924 (1999-12-01), Lal et al.
patent: 6372330 (2002-04-01), Do et al.
patent: 6391430 (2002-05-01), Fullerton et al.
patent: 6753072 (2004-06-01), Chen et al.
patent: 6759149 (2004-07-01), Chen et al.
patent: 6773834 (2004-08-01), Do et al.
patent: 6821652 (2004-11-01), Okamoto et al.
patent: 6942936 (2005-09-01), Oikawa et al.
patent: 7008702 (2006-03-01), Fukuzawa et al.
patent: 7070870 (2006-07-01), Bertero et al.
patent: 7149045 (2006-12-01), Mallary et al.
patent: 7279240 (2007-10-01), Nolan
patent: 2002/0098381 (2002-07-01), Coffey et al.
patent: 2002/0136930 (2002-09-01), Oikawa et al.
patent: 2003/0017364 (2003-01-01), Kikitsu et al.
patent: 2003/0096127 (2003-05-01), Hikosaka et al.
patent: 2004/0033390 (2004-02-01), Oikawa et al.
patent: 2004/0219329 (2004-11-01), Oikawa et al.
patent: 2004/0253485 (2004-12-01), Nolan
patent: 2005/0030676 (2005-02-01), Fukuzawa et al.
patent: 2005/0237677 (2005-10-01), Shimazawa et al.
patent: 2006/0171084 (2006-08-01), Doerner et al.
patent: 2006/0177703 (2006-08-01), Takenoiri et al.
patent: 2006/0177704 (2006-08-01), Berger et al.
patent: 2006/0269794 (2006-11-01), Oikawa
patent: 2006/0286412 (2006-12-01), Jung
patent: 2007/0243418 (2007-10-01), Fullerton et al.
patent: WO96/25734 (1996-08-01), None
Benakli et al., “Micromagnetic Study of Switching Speed in Perpendicular Recording Media”, IEEE Trans. MAG 37, 1564-1566 (2001).
Gao et al., “Transition Jitter Estimates in Tilted and Conventional Perpendicular Recording Media at 1 Tb/in2”, IEEE Trans. MAG 39, 704-709 (2003).
Victoria et al., “Composite Media for Perpendicular Magnetic Recording”, IEEE Trans MAG 41 (2), 537-542, Feb. 2005.
Wang et al., “Composite media (dynamic tilted media) for magnetic recording”, Appl. Phys. Lett. 86 (14) Art. No. 142504, Apr. 1, 2005.
Girt et al., “Antiferromagnetically Coupled Perpendicular Recording Media”, IEEE Trans. on Magnetics, vol. 39, No. 5, Sep. 2003, pp. 2306-2310.
Supper et al. “Writability Enhancement Using Exchange Spring Media”, IEEE Trans MAG, vol. 41, No. 10, Oct. 2005, pp. 3238-3240.

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