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Phys Rev Lett. 2015 Jan 9;114(1):016603. Epub 2015 Jan 7.

Proximity-induced ferromagnetism in graphene revealed by the anomalous Hall effect.

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1
Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.

Abstract

We demonstrate the anomalous Hall effect (AHE) in single-layer graphene exchange coupled to an atomically flat yttrium iron garnet (YIG) ferromagnetic thin film. The anomalous Hall conductance has magnitude of ∼0.09(2e(2)/h) at low temperatures and is measurable up to ∼300  K. Our observations indicate not only proximity-induced ferromagnetism in graphene/YIG with a large exchange interaction, but also enhanced spin-orbit coupling that is believed to be inherently weak in ideal graphene. The proximity-induced ferromagnetic order in graphene can lead to novel transport phenomena such as the quantized AHE which are potentially useful for spintronics.

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