The magnetic properties of graphene-graphane superlattices with zigzag interfaces and separately varying widths are investigated by first-principles density functional calculations. It is demonstrated that magnetic states are energetically more stable than nonmagnetic ones due to the Stoner-type instability, and that antiferromagnetic spin configuration across the graphene strip is found to be the ground state, whereas the ferromagnetic ordering becomes metastable. The magnetic moments in the ferromagnetic states show a monotonic increase and saturation with the width of the graphene strip, independent of the graphane width due to the -character of the spin densities. These findings point toward an alternative route for graphene-based applications without requiring physical cutting as in graphene nanoribbons.
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27 September 2010
Research Article|
September 28 2010
Magnetic properties in graphene-graphane superlattices
Joo-Hyoung Lee;
Joo-Hyoung Lee
Department of Materials Science and Engineering,
Massachusetts Institute of Technology
, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Jeffrey C. Grossman
Jeffrey C. Grossman
a)
Department of Materials Science and Engineering,
Massachusetts Institute of Technology
, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Search for other works by this author on:
a)
Electronic mail: [email protected].
Appl. Phys. Lett. 97, 133102 (2010)
Article history
Received:
August 01 2010
Accepted:
September 09 2010
Citation
Joo-Hyoung Lee, Jeffrey C. Grossman; Magnetic properties in graphene-graphane superlattices. Appl. Phys. Lett. 27 September 2010; 97 (13): 133102. https://doi.org/10.1063/1.3495771
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