Magnetotransport through graphene spin valves

Details Magnetotransport through graphene spin valves Magnetotransport through graphene spin valves

2009-01-17

arxiv.org/abs/0901.2627v1

Phys. Rev. B 79, 045405 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.79.045405

We present a theoretical study on the spin-dependent transport through a spin valve consisting of graphene sandwiched between two magnetic leads with an arbitrary orientation of the lead magnetization. No gate voltage is applied. Using Keldysh's nonequilibrium Green's function method we show that, in absence of external magnetic fields, the current-voltage curves are nonlinear. Around zero bias the differential conductance versus bias voltage possesses a strong dip. The zero-bias anomaly in the tunnel magnetoresistance (TMR) is affected strongly by the leads spin polarization. Depending on the value of the bias voltage TMR exhibits a behavior ranging from an insulating to a metallic-type. In presence of a static external magnetic field the differential conductance and TMR as a function of the bias voltage and the strength of the magnetic field show periodic oscillations due to Landau-level crossings. We also inspect the effects of the temperature and the polarization degrees on the differential conductance and TMR.

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