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Magnetic Correlations at Graphene Edges: Basis for Novel Spintronics Devices
Open accessAbstract
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 $D=2100\text{ }\text{ }\mathrm{meV}\text{ }{\AA{}}^{2}$ and a spin-collinear domain wall creation energy ${E}_{\mathrm{dw}}=114\text{ }\text{ }\mathrm{meV}$ accompanied by low magnetic anisotropy. Above the crossover temperature ${T}_{x}\ensuremath{\approx}10\text{ }\text{ }\mathrm{K}$, the spin correlation length $\ensuremath{\xi}\ensuremath{\propto}{T}^{\ensuremath{-}1}$ limits the long-range magnetic order to $\ensuremath{\sim}1\text{ }\text{ }\mathrm{nm}$ 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.
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Generalized Gradient Approximation Made Simple
Perdew, J. P., Burke, K., & Ernzerhof, M. (1996) · Physical Review Letters · doi:10.1103/physrevlett.77.3865 · Cited by 215,824
Geim, A. K., & Novoselov, K. S. (2007) · Nature Materials · doi:10.1038/nmat1849 · Cited by 39,979
Cited by
Zak phase and the existence of edge states in graphene
Delplace, P., Ullmo, D., & Montambaux, G. (2011) · Physical Review B · doi:10.1103/physrevb.84.195452 · Cited by 541
Electronic Structure of Atomically Precise Graphene Nanoribbons
Ruffieux, P., Cai, J., Plumb, N. C., Patthey, L., Prezzi, D., Ferretti, A., Molinari, E., Feng, X., Müllen, K., Pignedoli, C. A., et al. (2012) · ACS Nano · doi:10.1021/nn3021376 · Cited by 494
Topological Frustration in Graphene Nanoflakes: Magnetic Order and Spin Logic Devices
Wang, W. L., Yazyev, O. V., Meng, S., & Kaxiras, E. (2009) · Physical Review Letters · doi:10.1103/physrevlett.102.157201 · Cited by 288
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Metadata
- Authors
- Yazyev, O. V., & Katsnelson, M. I.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2008-01-31
- Volume
- 100
- Issue
- 4
- Pages
- 047209-047209
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W1968962150
- Cited by
- 741
- References
- 2
- FWCI
- 26.10
- Type
- journal article
- Language
- en
- Open access
- green
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