Magnetic correlations at graphene edges: basis for novel spintronics devices.
- Yazyev OV Ecole Polytechnique Fédérale de Lausanne, Institute of Theoretical Physics, CH-1015 Lausanne, Switzerland. oleg.yazyev@epfl.ch
- Katsnelson MI
- 2008-03-21
Published in:
- Physical review letters. - 2008
English
Magnetic zigzag edges of graphene are considered as a basis for novel spintronics devices despite the fact that no true long-range magnetic order is possible in one dimension. We study the transverse and longitudinal fluctuations of magnetic moments at zigzag edges of graphene from first principles. We find a high value for the spin wave stiffness D=2100 meV A2 and a spin-collinear domain wall creation energy E(dw)=114 meV accompanied by low magnetic anisotropy. Above the crossover temperature T(x) approximately 10 K, the spin correlation length xi proportional, variantT(-1) limits the long-range magnetic order to approximately 1 nm at 300 K while below T(x), it grows exponentially with decreasing temperature. We discuss possible ways of increasing the range of magnetic order and effects of edge roughness on it.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.100.047209
- PMID 18352331
- Persistent URL
- https://sonar.ch/global/documents/69343
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