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Control of spin-polarised currents in graphene nanorings

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Saiz-Bretín, Marta and Munarriz, J. and Malyshev, Andrey and Domínguez-Adame Acosta, Francisco (2015) Control of spin-polarised currents in graphene nanorings. Physics letters A, 379 (36). pp. 2102-2105. ISSN 0375-9601

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Official URL: http://dx.doi.org/10.1016/j.physleta.2015.06.027


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Abstract

We study electronic transport in systems comprising square graphene nanorings with a ferromagnetic insulator layer on top of them. The rings are connected symmetrically or asymmetrically to contacts. The proximity exchange interaction of electrons with agnetic ions results in spin-dependent transport properties. When a nanoring is connected asymmetrically, the occurrence of Fano-like antiresonances in the transmission coefficient can induce abrupt changes in the spin polarisation under minute variations of the Fermi energy. We also demonstrate that the spin polarization can be efficiently controlled by a side-gate voltage. This opens a possibility to use these effects for fabricating tunable sources of polarised electrons.


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©Elsevier.
F. D-A. thanks the Theoretical Physics Group of the University of Warwick for the warm hospitality and the Spanish Ministry of Education (grant PRX14/00129). This work was supported by MINECO (project MAT2013-46308). A. V. M. was partially supported by CAPES (grant PVE-A121).

Uncontrolled Keywords:Quantum rings; Graphene; Spin polarization; Spintronics
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:33336
Deposited On:29 Sep 2015 11:45
Last Modified:05 Jul 2018 14:47

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