Electrodeposition of Compositionally Modulated Nanowires for Racetrack Memory Applications

Racetrack memory, a memory device based on the current driven domain wall motion in a magnetic nanowire, has been recently proposed by Stuart Parkin and his group. In this proposed device, the information was stored as magnetic domain walls or domains in a wire. Nanosecond-long current pulses are applied to one end of the wire to push the domain walls to move along the wire by magnetic angular momentum transfer. While a magnetic field drives the domain walls with opposite polarities to move in opposite directions, the spin polarized current is expected to drive them to move in the same direction. This motion has been recently demonstrated for two domain walls with different polarities.

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