Unidirectional racetrack memory device

Details Unidirectional racetrack memory device Unidirectional racetrack memory device

2009-01-05

2009-06-23

Dinh, Son (Department: 2824)

Static information storage and retrieval

Magnetic shift registers

C365S158000, C365S171000, C977S933000

Reexamination Certificate

active

07551469

ABSTRACT:
A racetrack memory storage device moves domain walls along the racetrack in one direction only. The reading element can be positioned at one end of the racetrack (rather than in the middle of the racetrack). The domain walls are annihilated upon moving them across the reading element but their corresponding information is read into one or more memory devices (e.g., built-in CMOS circuits). The information can then be processed in circuits for computational needs and written back into the racetrack either in its original form (as it was read out of the racetrack) or in a different form after some computation, using a writing element positioned at the end of the racetrack opposite to the reading element. Such a racetrack can be built more simply and has greater reliability of operation than previous racetrack memory devices.

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Supporting Online Material for: Parkin et al., “Magnetic Domain-Wall Racetrack Memory,” Science, Apr. 2008, vol. 320, American Association for the Advancement of Science, Washington DC, USA.
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Supporting Online Material for: Hayashi et al., “Current-Controlled Magnetic Domain-Wall Nanowire Shift Register,” Science, Apr. 2008, pp. 209-211, vol. 320, American Association for the Advancement of Science, Washington DC, USA.

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