Observation of magnetic edge state in graphene nanoribbons

V. L.Joseph Joly, Manabu Kiguchi, Si Jia Hao, Kazuyuki Takai, Toshiaki Enoki, Ryohei Sumii, Kenta Amemiya, Hiroyuki Muramatsu, Takuya Hayashi, Yoong Ahm Kim, Morinobu Endo, Jessica Campos-Delgado, Florentino López-Urías, Andrés Botello-Méndez, Humberto Terrones, Mauricio Terrones, Mildred S. Dresselhaus

Research output: Contribution to journalArticle

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Abstract

The electronic structure and spin magnetism for few-layer-graphene nanoribbons synthesized by chemical vapor deposition have been investigated using near-edge x-ray absorption fine structure (NEXAFS) and electron-spin resonance (ESR). For the pristine sample, a prepeak was observed below the π* peak close to the Fermi level in NEXAFS, indicating the presence of additional electronic states close to the Fermi level. The intensity of this prepeak decreased with increasing annealing temperature and disappeared after annealing above 1500°C. The ESR spectra, which proved the presence of localized spins, tracked the annealing-temperature-dependent behavior of the prepeak with fidelity. The NEXAFS and ESR results jointly confirm the existence of a magnetic edge state that originates from open nanographene edges. The disappearance of the edge state after annealing at higher temperatures is explained by the decrease in the population of open edges owing to loop formation of adjacent graphene edges.

Original languageEnglish (US)
Article number245428
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number24
DOIs
StatePublished - Jun 22 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Joly, V. L. J., Kiguchi, M., Hao, S. J., Takai, K., Enoki, T., Sumii, R., Amemiya, K., Muramatsu, H., Hayashi, T., Kim, Y. A., Endo, M., Campos-Delgado, J., López-Urías, F., Botello-Méndez, A., Terrones, H., Terrones, M., & Dresselhaus, M. S. (2010). Observation of magnetic edge state in graphene nanoribbons. Physical Review B - Condensed Matter and Materials Physics, 81(24), [245428]. https://doi.org/10.1103/PhysRevB.81.245428