Wang Zhiyong, Tang Chi, Sachs Raymond, Barlas Yafis, Shi Jing
Department of Physics and Astronomy, University of California, Riverside, California 92521, USA.
Phys Rev Lett. 2015 Jan 9;114(1):016603. doi: 10.1103/PhysRevLett.114.016603. Epub 2015 Jan 7.
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.
我们展示了与原子级平整的钇铁石榴石（YIG）铁磁薄膜交换耦合的单层石墨烯中的反常霍尔效应（AHE）。在低温下，反常霍尔电导的大小约为0.09(2e(2)/h)，并且在高达约300 K时均可测量。我们的观察结果不仅表明石墨烯/YIG中存在具有大交换相互作用的近邻诱导铁磁性，还表明存在增强的自旋轨道耦合，而在理想石墨烯中，这种耦合被认为本质上是较弱的。石墨烯中的近邻诱导铁磁序可导致诸如量子化反常霍尔效应等新型输运现象，这些现象可能对自旋电子学有用。
