Wednesday, November 28, 2012

1211.6377 (H. -X. Yang et al.)

Magnetic Insulator-Induced Proximity Effects in Graphene: Spin Filtering
and Exchange Splitting Gaps

H. -X. Yang, A. Hallal, D. Terrade, X. Waintal, S. Roche, M. Chshiev
We report on first-principles calculations of spin-dependent properties in graphene induced by its interaction with a nearby magnetic insulator (Europium oxide, EuO). The magnetic proximity effect results in spin polarization of graphene $\pi$ orbitals by up to 24 %, together with large exchange splitting bandgap of about 36 meV. The position of the Dirac cone is further shown to depend strongly on the graphene-EuO interlayer. These findings point towards the possible engineering of spin gating by proximity effect at relatively high temperature, which stands as a hallmark for future all-spin information processing technologies.
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