Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3537965
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The coherent spin-polarized electron transport through a zigzag-edge graphene flake (ZGF), sandwiched between two semi-infinite armchair graphene nanoribbons, is investigated by means of Landauer-Buttiker formalism. To study the edge magnetism of the ZGF, we use the half-filled Hubbard model within the Hartree-Fock approximation. The results show that the junction acts as a spin filter with high degree of spin polarization in the absence of magnetic electrodes and external fields. By applying a gate voltage the spin-filtering efficiency of this device can be effectively controlled and the spin polarization can reach values as high as 90%. (c) 2011 American Institute of Physics. [doi:10.1063/1.3537965]
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