Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2005-03-08
2005-03-08
Tran, Sinh (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S055000, C360S131000
Reexamination Certificate
active
06865044
ABSTRACT:
A method for magnetic recording uses a fixed write current with thermal assistance to record on a patterned perpendicular magnetic recording medium. The patterned medium has magnetic blocks or islands, each of which contains a stack of individual magnetic cells to provide multilevel recording. Each cell in an island is formed of a material or set of materials to provide the cell with perpendicular magnetic anisotropy and is a single magnetic domain. Each cell is magnetically decoupled from the other cells in its island by nonmagnetic spacer layers. Thus each cell can have a magnetization (magnetic moment) in one of two directions (into or out of the plane of the layer making up the cell), and this magnetization is independent of the magnetization of the other cells in its island. This permits multiple magnetic levels or states to be recorded in each magnetic island.
REFERENCES:
patent: 5436448 (1995-07-01), Hosaka et al.
patent: 5583727 (1996-12-01), Parkin
patent: 5804710 (1998-09-01), Mamin et al.
patent: 5820769 (1998-10-01), Chou
patent: 5844755 (1998-12-01), Yamane et al.
patent: 5900728 (1999-05-01), Moser et al.
patent: 5900729 (1999-05-01), Moser et al.
patent: 6011664 (2000-01-01), Kryder et al.
patent: 6331364 (2001-12-01), Baglin et al.
patent: 6383597 (2002-05-01), Fullerton et al.
patent: 6391430 (2002-05-01), Fullerton et al.
patent: 6493183 (2002-12-01), Kasiraj et al.
patent: 6660357 (2003-12-01), Litvinov et al.
patent: 20030021191 (2003-01-01), Hsu et al.
patent: 20030107833 (2003-06-01), Rettner et al.
R. L. White et al., “Patterned Media: A Viable Route to 50 Gbit/in2 and Up for Magnetic Recording?”, IEEE Transactions on Magnetics, vol. 33, No. 1, Jan. 1997, 990-995.
C. Chappert, et al., “Planar Patterned Magnetic Media Obtained by Ion Irradiation,” Science, vol. 280, Jun. 19, 1998, pp. 1919-922.
E. Eleftheriou et al., “Millipede-A MEMS-Based Scanning-Probe Data-Storage System”, IEEE Transactions on Magnetics, vol. 39, No. 2, Mar. 2003, pp. 938-945.
M. Kleiber et al., “Magnetization switching of submicrometer Co dots induced by a magnetic force microscope tip”, Phys Rev B, vol. 58, No. 9, Sep. 1, 1998, pp. 5563-5567.
J. Lohau et al. “Writing and reading perpendicular magnetic recording media patterned by a focused ion beam”, Appl Phys Lett, vol. 78, No. 7, Feb. 12, 2001, pp. 990-992.
B. Cui et al. “Perpendicular quantized magnetic disks with 45 Gbits on a 4x4 cm2 area”, J Appl Phys, vol. 85, No. 8, Apr. 15, 1999, pp. 5534-5536.
Haginoya C. et al., “Thermomagnetic writing on 29 Gbit/in.(2) patterned magnetic media”, Appl Phys Lett 75 (20): 3159-3161 Nov. 15, 1999.
Castano F. wt al., “Magnetic force microscopy and x-ray scattering study of 70x550 nm(2) pseudo-spin-valve nanomagnets”, J Appl Phys 93 (10): 7927-7929 Part 3 May 15, 2003.
Todorovic M., “Writing and reading of single magnetic domain per bit perpendicular patterned media”, Appl Phys Lett 74 (17): 2516-2518 Apr. 26, 1999.
Ross C., “Patterned magnetic recording media”, Annu Rev Mater Res 31: 203-235 2001.
A. Dietzel et al., “Ion Projection Direct Structuring for Patterning of Magnetic Media”, IEEE Transactions on Magnetics, vol. 38, No. 5, Sep. 2002, pp. 1952-195.
Albrecht Manfred
Hellwig Olav
Hu Guohan
Terris Bruce David
Berthold Thomas R.
Davidson Dan I
Hitachi Global Storage Technologies - Netherlands B.V.
Tran Sinh
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