Controllable spin transport in ferromagnetic graphene junctions

Details Controllable spin transport in ferromagnetic graphene junctions Controllable spin transport in ferromagnetic graphene junctions

2008-01-10

arxiv.org/abs/0801.1552v2

Phys. Rev. B 77, 073413 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.073413

We study spin transport in normal/ferromagnetic/normal graphene junctions where a gate electrode is attached to the ferromagnetic graphene. We find that due to the exchange field of the ferromagnetic graphene, spin current through the junctions has an oscillatory behavior with respect to the chemical potential in the ferromagnetic graphene, which can be tuned by the gate voltage. Especially, we obtain a controllable spin current reversal by the gate voltage. Our prediction of high controllability of spin transport in ferromagnetic graphene junction may contribute to the development of the spintronics.

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