期刊
NANO LETTERS
卷 11, 期 1, 页码 151-155出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl1031919
关键词
Molecular electronic devices; electron transport; graphene; NEGF-DFT
类别
资金
- FQRNT of Quebec
- NSERC of Canada
- CIFAR
We report a first principles study of spin transport under finite bias through a graphene-ferromagnet (FM) interface, where FM = Co(111), Ni(111). The use of Co and Ni electrodes achieves spin efficiencies reaching 80% and 60%, respectively. This large spin filtering results from the materials specific interaction between graphene and the FM which destroys the linear dispersion relation of the graphene bands and leads to an opening of spin-dependent energy gaps of approximate to 0.4-0.5 eV at the K points. The minority spin band gap resides higher in energy than the majority spin band gap located near E-F, a feature that results in large minority spin dominated currents.
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