Functionalized Graphene for High-Performance Two-Dimensional Spintronics Devices

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• 作者：Linze Li ; Rui Qin ; Hong Li ; Lili Yu ; Qihang Liu ; Guangfu Luo ; Zhengxiang Gao ; Jing Lu
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：April 26, 2011
• 年：2011
• 卷：5
• 期：4
• 页码：2601-2610
• 全文大小：1077K
• 年卷期：0
• ISSN：1936-086X

文摘

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.