Anti-ferromagnetically coupled granular-continuous magnetic...

Details Anti-ferromagnetically coupled granular-continuous magnetic... Anti-ferromagnetically coupled granular-continuous magnetic...

2007-04-10

2007-04-10

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S830000

Reexamination Certificate

active

10806114

ABSTRACT:
An anti-ferromagnetically coupled, granular-continuous (“AFC-GC”) magnetic recording medium having increased thermal stability, writability, and signal-to-medium noise ratio (“SMNR”), comprising a layer stack including, in sequence from a surface of a non-magnetic substrate:(a) a continuous ferromagnetic stabilizing layer;(b) a non-magnetic spacer layer; and(c) a granular ferromagnetic recording layer;wherein:(i) the continuous ferromagnetic stabilizing and granular ferromagnetic recording layers are anti-ferromagnetically coupled across the non-magnetic spacer layer, the amount of anti-ferromagnetic coupling preselected to ensure magnetic relaxation after writing;(ii) lateral interactions in the granular, ferromagnetic recording layer are substantially completely eliminated or suppressed; and(iii) the exchange coupling strength in the continuous, ferromagnetic stabilizing layer is preselected to be slightly larger than the strength of the anti-ferromagnetic coupling provided by the non-magnetic spacer layer to thereby enhance thermal stability of the recording bits.

REFERENCES:
patent: 5723978 (1998-03-01), Inomata et al.
patent: 6280813 (2001-08-01), Carey et al.
patent: 6383668 (2002-05-01), Fullerton et al.
patent: 6420058 (2002-07-01), Haratami et al.
patent: 6468670 (2002-10-01), Ikeda et al.
patent: 6635367 (2003-10-01), Igarashi et al.
patent: 6773834 (2004-08-01), Do et al.
patent: 6777112 (2004-08-01), Girt et al.
patent: 2002/0098390 (2002-07-01), Do et al.
patent: 2002/0136929 (2002-09-01), Oikawa et al.
patent: 2004/0086753 (2004-05-01), Inomata

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