Sign-changeable spin-filter efficiency and giant magnetoresistance in seamless graphene nanoribbon junctions

► Quantum transport properties of graphene nanoribbons are calculated. ► Graphene nanoribbons exhibit sign-changeable spin-filter efficiency. ► They also show high room-temperature magnetoresistance. Sign-changeable spin-filter efficiency is predicted in both the ferromagnetic and antiferromagnetic...

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Bibliographic Details
Published in:Computational materials science 2011-08, Vol.50 (10), p.2886-2890
Main Authors: Xu, Chengyong, Li, Linze, Li, Hong, Qin, Rui, Zheng, Jiaxin, Luo, Guangfu, Liu, Qihang, Yan, Xin, Yu, Lili, Lu, Jing, Gao, Zhengxiang
Format: Article
Language:English
Subjects:
Computational efficiency
Computing time
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electrodes
Electronic transport in condensed matter
Exact sciences and technology
Graphene
Graphene nanoribbon
Magnetoresistance
Magnetoresistivity
Nanocomposites
Nanomaterials
Nanostructure
Physics
Quantum transport calculation
Spin polarized transport
Spin-filter efficiency
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Summary:► Quantum transport properties of graphene nanoribbons are calculated. ► Graphene nanoribbons exhibit sign-changeable spin-filter efficiency. ► They also show high room-temperature magnetoresistance. Sign-changeable spin-filter efficiency is predicted in both the ferromagnetic and antiferromagnetic configurations of a zigzag graphene nanoribbon bridging two half-planar graphene electrodes from ab initio quantum transport calculations. By changing edge spin-polarization configuration, we obtain giant room-temperature magnetoresistance, which is one order of magnitude larger than the maximum experimental results.
ISSN:0927-0256
1879-0801
DOI:10.1016/j.commatsci.2011.05.004