State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, People's Republic of China.
ACS Nano. 2011 Apr 26;5(4):2601-10. doi: 10.1021/nn102492g. Epub 2011 Mar 21.
Using first-principles calculations, we explore the possibility of functionalized graphene as a high-performance two-dimensional spintronics device. Graphene functionalized with O on one side and H on the other side in the chair conformation is found to be a ferromagnetic metal with a spin-filter efficiency up to 54% at finite bias. The ground state of graphene semifunctionalized with F in the chair conformation is an antiferromagnetic semiconductor, and we construct a spin-valve device from it by introducing a magnetic field to stabilize its metallic ferromagnetic state. The resulting room-temperature magnetoresistance is up to 2200%, which is 1 order of magnitude larger than the available experimental values.
我们通过第一性原理计算研究了功能化石墨烯作为高性能二维自旋电子器件的可能性。我们发现，在扶手椅构象中，一侧为 O 而另一侧为 H 的功能化石墨烯是一种铁磁金属，在有限偏压下的自旋过滤效率高达 54%。在扶手椅构象中，半功能化的石墨烯被 F 取代，其基态是一种反铁磁半导体，我们通过引入磁场来构建一个自旋阀器件，以稳定其金属铁磁状态。由此产生的室温磁电阻高达 2200%，比现有实验值大 1 个数量级。
