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Current-induced vortex-vortex switching in a nanopillar comprising two Co nano-rings

Yang, T., Hirohata, A., Hara, M., Kimura, T. and Otani, Y. (2007) Current-induced vortex-vortex switching in a nanopillar comprising two Co nano-rings. Applied Physics Letters, 90 (9). pp. 92505-92508. ISSN 0003-6951

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The authors fabricated a current-perpendicular-to-plane pseudo-spin-valve nanopillar comprising a thick and a thin Co rings with deep submicron lateral sizes. The dc current can effectively induce the flux-closure vortex states in the rings with desired chiralities. Abrupt transitions between the vortex states are also realized by the dc current and detected with the giant magnetoresistance effect. Both Oersted field and spin-transfer torque are found important to the magnetic transitions, but the former is dominant. They can be designed to cooperate with each other in the vortex-to-vortex transitions by carefully setting the chirality of the vortex state in the thick Co ring.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Electronics (York)
Depositing User: York RAE Import
Date Deposited: 14 Aug 2009 09:09
Last Modified: 14 Aug 2009 09:09
Published Version: http://dx.doi.org/10.1063/1.2710185
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.2710185
URI: http://eprints.whiterose.ac.uk/id/eprint/5630

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