Spin transport in proximity induced ferromagnetic graphene

Details Spin transport in proximity induced ferromagnetic graphene Spin transport in proximity induced ferromagnetic graphene

2007-07-26

arxiv.org/abs/0707.3976v2

Phys. Rev. B 77, 115406 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 11 figures

Scientific paper

10.1103/PhysRevB.77.115406

Magnetic gates in close proximity to graphene can induce ferromagnetic correlations. We study the effect of such induced magnetization dependent Zeeman splittings on the graphene transport properties. We estimate that induced spin splittings of the order of \Delta ~ 5 meV could be achieved with the use of magnetic insulator gates, e.g. EuO-gates, deposited on top of graphene. We demonstrate that such splittings in proximity induced ferromagnetic graphene could be determined directly from the tunneling resonances in the linear response conductance, as the top gate creates also a tunable barrier in the graphene layer. We show how such splittings could also be determined independently by magnetoresistance measurements in a spin-valve geometry. Because the spin polarization of the current near the Dirac point increases with the length of the barrier, long magnetic gates are desirable for determining \Delta experimentally.

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