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(2e2/h) at low temperatures and is measurable up to ~ 300 K. Our observations indicate not only proximity-induced ferromagnetism in graphene/YIG with large exchange interaction, but also enhanced spin-orbit coupling which 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.
@article{arxiv.1412.1521,
title = {Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect},
author = {Zhiyong Wang and Chi Tang and Raymond Sachs and Yafis Barlas and Jing Shi},
journal= {arXiv preprint arXiv:1412.1521},
year = {2015}
}