Electric field control of the indirect magnetic coupling through a short graphene nanoribbon
arXiv:1407.6397 · doi:10.1103/PhysRevB.90.085410
Abstract
In the paper we consider the system composed of two magnetic planes attached to zigzag terminations of the graphene nanostructure being an ultrashort fragment of the armchair nanoribbon. We investigate theoretically an indirect coupling between these magnetic planes mediated by charge carriers as a function of external in-plane electric field. The calculations are based on a tight-binding model supplemented with Hubbard term to account for coulombic interactions. For selected sizes of the graphene nanostructure, particularly high sensitivity of the coupling to the electric field is found. This leads to the possibility of control over coupling magnitude and continuous switching of its sign between antiferromagnetic and ferromagnetic one. Such a phenomenon is demonstrated in the numerical results and its origin is analysed. The robustness of this effect against armchair edge deformation and variation of exchange energy between magnetic planes and spins of charge carriers is discussed in detailed way.
References in corpus (22)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Energy Gaps in Graphene Nanoribbons
- Valley filter and valley valve in graphene
- Emergence of magnetism in graphene materials and nanostructures
- Magnetism in graphene nano-islands
- Metallic Graphene Nanodisks
- Magnetic Moment Formation in Graphene Detected by Scattering of Pure Spin Currents
- Energy gap tuning in graphene on hexagonal boron nitride bilayer system
- Experimentally Engineering the Edge Termination of Graphene Nanoribbons
- Spintronics with graphene
- Indirect Exchange and Ruderman-Kittel-Kasuya-Yosida (RKKY) Interactions in Magnetically-Doped Graphene
- RKKY interaction in carbon nanotubes and graphene nanoribbons
- Orbital magnetism of graphene flakes
- Manipulation of edge magnetism in hexagonal graphene nanoflake
- RKKY Interactions in Graphene: Dependence on Disorder and Gate Voltage
- Gate-Tunable Exchange Coupling Between Cobalt Clusters on Graphene
- Magnetic Response of Interacting Electrons in a Fractal Network: A Mean Field Approach
- Indirect RKKY interaction in armchair graphene nanoribbons
- Low voltage control of ferromagnetism in a semiconductor p-n junction
- Quasi-Ferromagnet Spintronics in Graphene Nanodisk-Lead System
- Indirect coupling between localized magnetic moments in triangular graphene nanoflakes
Cited by in corpus (4)
- Graphene nanoflakes in external electric and magnetic in-plane fields
- Effective magnetic correlations in hole-doped graphene nanoflakes
- Surface superconductor-insulator transition induced by an electric field
- Surface superconductor-insulator transition: Reduction of the critical electric field by Hartree-Fock potential