Carbon-based nanostructures and graphene, in particular, evoke a lot ofinterest as new promising materials for nanoelectronics and spintronics. One ofthe most important issue in this context is the impact of external electrodeson electronic properties of graphene nanoribbons (GNR). The present theoreticalmethod is based on the tight-binding model and a modified recursive procedurefor Green's functions. The results show that within the ballistic transportregime, the so called end-contacted geometry (of minimal GNR/electrodeinterface area), is usually more advantageous for practical applications thanits side-contacted counterpart (with a larger coverage area), as far as theelectrical conductivity is concerned. As regards the giant magnetoresistancecoefficient, however, the situation is exactly opposite, since spin- splittingeffects are more pronounced in the lower conductive side-contacted setups.
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