Spin currents and magnetoresistance of graphene-based magnetic junctions
arXiv:0903.0407 · doi:10.1140/epjb/e2009-00034-6
Abstract
Using the tight-binding approximation and the nonequilibrium Green's function approach, we investigate the coherent spin-dependent transport in planar magnetic junctions consisting of two ferromagnetic (FM) electrodes separated by a graphene flake (GF) with zigzag or armchair interfaces. It is found that the electron conduction strongly depends on the geometry of contact between the GF and the FM electrodes. In the case of zigzag interfaces, the junction demonstrates a spin-valve effect with high magnetoresistance (MR) ratios and shows negative differential resistance features for a single spin channel at positive gate voltage. In the case of armchair interfaces, the current-voltage characteristics behave linearly at low bias voltages and hence, both spin channels are in on state with low MR ratios.
6 pages, 5 figures
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Cited by in corpus (6)
- Spin Transport and Relaxation in Graphene
- Controllable spin-dependent transport in armchair graphene nanoribbon structures
- Electronic transport through a graphene-based ferromagnetic/normal/ferromagnetic junction
- Magnetoresistive effect in graphene nanoribbon due to magnetic field induced band gap modulation
- Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads
- Anisotropic quantum transport in monolayer graphene in the presence of Rashba spin-orbit coupling