Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Reexamination Certificate
2010-11-09
2011-12-20
Neyzari, Ali (Department: 2627)
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
C369S013330, C369S013240, C360S055000, C360S059000, C360S131000
Reexamination Certificate
active
08081542
ABSTRACT:
A thermally-assisted recording (TAR) patterned-media magnetic recording disk drive has a perpendicular patterned-media disk with multilevel data islands and a laser capable of supplying multiple levels of output power to a near-field transducer (NFT). If there are only two cells in each island, each island is formed of an upper cell of magnetic material with a coercivity HC1and a Curie temperature TC1, a lower cell of magnetic material with a coercivity HC2and a Curie temperature TC2greater than TC1, and a nonmagnetic spacer layer between the two cells. Each cell is formed of high-anisotropy material so as to have an anisotropy field greater than the magnetic write field. The TAR laser is capable of supplying at least two levels of output power to the NFT to allow the islands to be heated to two distinct temperatures so that the two cells in an island can be written so as to have either the same or opposite magnetizations.
REFERENCES:
patent: 6865044 (2005-03-01), Albrecht et al.
patent: 6882488 (2005-04-01), Albrecht et al.
patent: 6906879 (2005-06-01), Albrecht et al.
patent: 6950260 (2005-09-01), Coffey et al.
patent: 7706179 (2010-04-01), Khizroev
patent: 2008/0085424 (2008-04-01), Dobin et al.
patent: 2009/0040644 (2009-02-01), Lu et al.
patent: 2009/0080109 (2009-03-01), Fukuzawa et al.
patent: 9035344 (1997-02-01), None
patent: 2006059474 (2006-03-01), None
Ikemoto et al., “Control of Curie Temperature of FePt(Cu) Films Prepared From Pt(Cu)/Fe Bilayers”, IEEE Transactions on Magnetics, vol. 44, Issue 11, Nov. 2008, pp. 3543-3546.
Willoughby, “Electronic and magnetic properties of Fe1-xCuxPt”, J. Appl. Phys. 95, 6586 (2004).
Thiele et al., “Temperature dependent magnetic properties of highly chemically ordered Fe55-xNixPt45L10 films”, J. Appl, Phys. 91, 6595 (2002).
Khizroev et al., “Physics considerations in the design of three-dimensional and multilevel magnetic recording”, Journal of Applied Physics 100, 063907 2006.
Grobis Michael Konrad
Stipe Barry Cushing
Weller Dieter K.
Zeltzer Gabriel
Berthold Thomas R.
Hitachi Global Technologies Netherlands B.V.
Neyzari Ali
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