Spin waves in zigzag graphene nanoribbons and the stability of edge ferromagnetism
arXiv:1007.3285 · doi:10.1088/1367-2630/13/3/033028
Abstract
We study the low energy spin excitations of zigzag graphene nanoribbons of varying width. We find their energy dispersion at small wave vector to be dominated by antiferromagnetic correlations between the ribbon's edges, in accrodance with previous calculations. We point out that spin wave lifetimes are very long due to the semi-conducting nature of the electrically neutral nanoribbons. However, application of very modest gate voltages cause a discontinuous transition to a regime of finite spin wave lifetime. By further increasing doping the ferromagnetic alignments along the edge become unstable against transverse spin fluctuations. This makes the experimental detection of ferromagnetism is this class of systems very delicate, and poses a difficult challenge to the possible uses of these nanoribbons as basis for spintronic devices.
arXiv commentNew version after major revision
References in corpus (11)
- Energy Gaps in Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Magnetic Correlations at Graphene Edges
- Electronic structure and magnetic properties of graphitic ribbons
- Giant magnetoresistance in ultra-small Graphene based devices
- Carrier Density and Magnetism in Graphene Zigzag Nanoribbons
- Theory of the Magnetic-Field-Induced Insulator in Neutral Graphene
- Emergence of local magnetic moments in doped graphene-related materials
- Indirect exchange coupling between magnetic adatoms in carbon nanotubes
- Tunable edge magnetism at graphene/graphane interfaces
- Spin waves in ultrathin ferromagnetic overlayers
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- Fractionalized Spin Excitations in the Edge Ferromagnetic State of Graphene: Signature of the Ferromagnetic Luttinger Liquid
- Bistability of zigzag edge magnetism in graphene nanoribbons induced by electric field
- Zigzag nanoribbon of gated bilayer hexagonal crystals with spontaneous edge magnetism