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Title: Tunable magnetic flux sensor using a metallic Rashba ring with half-metal electrodes
Authors: Chen, J. 
Jalil, M.B.A. 
Tan, S.G. 
Issue Date: 1-Apr-2011
Source: Chen, J., Jalil, M.B.A., Tan, S.G. (2011-04-01). Tunable magnetic flux sensor using a metallic Rashba ring with half-metal electrodes. Journal of Applied Physics 109 (7) : -. ScholarBank@NUS Repository.
Abstract: We propose a magnetic field sensor consisting of a square ring made of metal with a strong Rashba spin-orbital coupling (RSOC) and contacted to half-metal electrodes. Due to the Aharonov-Casher effect, the presence of the RSOC imparts a spin-dependent geometric phase to conduction electrons in the ring. The combination of the magnetic flux emanating from the magnetic sample placed below the ring, and the Aharonov-Casher effect due to RSOC results in spin interference, which modulates the spin transport in the ring nanostructure. By using the tight-binding nonequilibrium Green's function formalism to model the transport across the nanoring detector, we theoretically show that with proper optimization, the Rashba ring can function as a sensitive and tunable magnetic probe to detect magnetic flux. © 2011 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.3560045
Appears in Collections:Staff Publications

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