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Applied Physics Letters / Volume 99 / Issue 8 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 99, 083101 (2011); http://dx.doi.org/10.1063/1.3630229 (3 pages)

A spin-valve device based on dumbbell-shaped graphene nanoislands

Zhaoli Ma and Weidong Sheng

Department of Physics, Fudan University, Shanghai 200433, China

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(Received 25 May 2011; accepted 9 August 2011; published online 22 August 2011)

Electron transport in a graphene nanoisland with mixed edge profiles is studied by using the spin-unrestricted Hubbard model. The dumbbell-shaped device consists of two hexagonal nanoislands with zigzag edges connected by a armchair nanoribbon. Including the nearest-neighbor hopping and on-site Coulomb repulsion, the self-consistent calculation shows that two distinct ferromagnetic configurations allowed for the proposed device act like ON and OFF states for spin-polarized electrons. Furthermore, the spin-valve effect is demonstrated, as a proof of concept, in the device occupied by one ferromagnetic configuration without resorting to external magnetic or electric fields.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

ferromagnetic materials, graphene, Hubbard model, island structure, nanostructured materials, spin polarised transport, spin valves

PACS

  • 85.75.-d

    Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3630229

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

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