Magneto-transport in impurity-doped few-layer graphene spin valve

Abstract

Using Keldysh nonequilibrium Green's function method we study the spin-dependent transport through impurity-doped few layer graphene sandwiched between two magnetic leads with an arbitrary mutual orientations of the magnetizations. We find for parallel electrodes magnetizations that the differential conductance possesses two resonant peaks as the applied bias increases. These peaks are traced back to a buildup of a magnetic moment on the impurity due to the electrodes spin polarization. For a large mutual angle of the electrodes magnetization directions, the two resonant peaks approach each others and merge into a single peak for antiparallel orientation of the electrodes magnetizations. We point out that the tunneling magnetoresistance (TMR) may change sign for relatively small changes in the values of the polarization parameters. Furthermore, we inspect the behaviour of the differential conductance and TMR upon varying the temperature.

8 pages, 7 figures, accepted by Phys. Rev. B

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Cited by in corpus (4)

• Nonequilibrium self-energies, Ng approach and heat current of a nanodevice for small bias voltage and temperature
• Time-dependent magneto-transport in a driven graphene spin valve
• Topological view on magnetic adatoms in graphene
• Comment on "Magnetotransport through graphene spin valves" and its following works