Electronic transport through a graphene-based ferromagnetic/normal/ferromagnetic junction

Abstract

Electronic transport in a graphene-based ferromagnetic/normal/ferromagnetic junction is investigated by means of Landauer-Büttiker formulism and the nonequilibrium Green's function technique. For the zigzag edge case, the results show that the conductance is always larger than $e^2/h$ for the parallel configuration of lead magnetizations, but for the antiparallel configuration the conductance becomes zero because of the band-selective rule. So a magnetoresistance (MR) plateau emerges with the value 100% when the Fermi energy is located around the Dirac point. Besides, choosing narrower graphene ribbons can obtain the wider 100% MR plateaus and the length change of the central graphene region does not affect the 100% MR plateaus. Although the disorder will reduce the MR plateau, the plateau value can be still kept about 50% even in a large disorder strength case. In addition, when the magnetizations of the left and right leads have a relative angle, the conductance changes as a cosine function of the angle. What is more, for the armchair edge case, the MR is usually small. So, it is more favorable to fabricate the graphene-based spin valve device by using the zigzag edge graphene ribbon.

15 pages, 9 figures

References in corpus (13)

• Electric Field Effect in Atomically Thin Carbon Films
• Ultrahigh electron mobility in suspended graphene
• Half-Metallic Graphene Nanoribbons
• Spin transport in proximity induced ferromagnetic graphene
• Charge Transport in Disordered Graphene-Based Low Dimensional Materials
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• Hyperfine Interactions in Graphene and Related Carbon Nanostructures
• MagnetoResistance of graphene-based spin valves
• Ferromagnetism in armchair graphene nanoribbon
• Spin currents and magnetoresistance of graphene-based magnetic junctions
• Magnetotransport through graphene spin valves
• First order ferromagnetic phase transition in the low electronic density regime of a biased graphene bilayer

Cited by in corpus (7)

• Spin Transport and Relaxation in Graphene
• Band bending and zero-conductance resonances controlled by edge electric fields in zigzag silicene nanoribbons
• Electronic transport through a silicene-based zigzag and armchair junction
• Non-collinear Andreev reflections in semiconductor nanowires
• Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads
• Magneto-transport in impurity-doped few-layer graphene spin valve
• Time-dependent magneto-transport in a driven graphene spin valve