title: Magnetic response of zigzag nanoribbons under electric fields.
abstract: Spin excitations in zigzag graphene nanoribbons are studied when the system is subjected to an electric field in the transversal direction. The magnetic properties and the lifetime of the spin excitations are systematically investigated and compared using a tight-binding electron-electron model treated by a mean-field Hubbard model. The effects of electron-hole asymmetry introduced by next-nearest neighbor hopping are also investigated. We show that by increasing the electric field, the antiferromagnetic correlations between the edges of the nanoribbons are decreased due to a reduction of the magnetic moments. The results show that the spin wave lifetime may be controlled by the intensity of the transversal electric field, indicating that zigzag nanoribbons may be considered great candidates for future spintronic applications.
authors.affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil.
authors.forename: F J
authors.initials: FJ
authors.lastname: Culchac
authors.forename: Rodrigo B
authors.initials: RB
authors.lastname: Capaz
authors.forename: A T
authors.initials: AT
authors.lastname: Costa
authors.forename: A
authors.initials: A
authors.lastname: Latgé
mesh_terms: D003198:Computer Simulation; D004560:Electricity; D006108:Graphite / Q000737:chemistry*; D060328:Magnetic Phenomena; D008956:Models, Chemical; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon; D006108:Graphite