Static information storage and retrieval – Magnetic shift registers
Reexamination Certificate
2008-08-22
2009-12-01
Dinh, Son (Department: 2824)
Static information storage and retrieval
Magnetic shift registers
C365S158000, C365S171000, C977S933000
Reexamination Certificate
active
07626844
ABSTRACT:
A racetrack memory device facilitates the manipulation of a series of domain walls along the racetrack. The racetrack is designed so that the domain wall energy increases and decreases in a continuous fashion between adjacent pinning sites, so that a domain wall does not become stuck between them. The variation in the domain wall energy along the racetrack can be provided by continuous variations of the racetrack's width (while maintaining constant thickness) and/or cross-sectional area (in which the racetrack dimensions are varied in both directions perpendicular to the length of the racetrack). Alternatively, this variation in domain wall energy may be provided by varying the magnetic properties of the racetrack along the racetrack while otherwise keeping the shape and size of the racetrack unchanged. In addition, variations of the racetrack's composition and/or shape can be used.
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Supporting Online Material for: Parkin et al., “Magnetic Domain-Wall Racetrack Memory,” Science, Apr. 2008, vol. 320, pp. 1-11, American Association for the Advancement of Science, Washington DC, USA.
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Patent Cooperation Treaty International Search Report dated Sep. 16, 2009 for International Application No. PCT/EP2009/056898.
Moriya Rai
Parkin Stuart
Thomas Luc
Byrne Harry W
Dinh Son
International Business Machines - Corporation
Johnson Daniel E.
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