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Spin-dependent transport induced by magnetization in zigzag graphene nanoribbons coupled to one-dimensional leads |
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| Authors: | Zhao Hu Zhang Xiao-Wei Cai Tuo Sang Tian Liu Xiao-Chun and Liu Fang |
| Affiliation: | Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China;Department of Physics and Electronics, Qiannan Normal College for Nationalities, Duyun 558000, China |
| Abstract: | We study spin transport in a zigzag graphene nanoribbon sample with two ferromagnetic strips deposited on the two sides of the ribbon. A tight-binding Hamiltonian was adopted to describe the sample connected to two one-dimensional leads. Our theoretical study shows that the resonance peaks of conductance for the spin-up and spin-down electrons are separated for the parallel configuration of the ferromagnetic strips, while they are not separated for the case of antiparallel configuration. This means that giant magnetoresistance can be produced at particular energies by altering the configurations of the ferromagnetic strips, and the device can be designed as a spin filter. |
| Keywords: | graphene nanoribbon giant magnetoresistance conductance current-voltage characteristic |
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