Observation of magnetic edge state in graphene nanoribbons
Name
Joly-2010-Observation of magne.pdf
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Checksum (MD5)
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Author(s)
Joly, V. L. Joseph
Kiguchi, Manabu
Hao, Si-Jia
Takai, Kazuyuki
Enoki, Toshiaki
Sumii, Ryohei
Amemiya, Kenta
Muramatsu, Hiroyuki
Hayashi, Takuya
Kim, Yoong Ahm
Date Issued
May 2010
Journal
Physical Review B
Publisher
American Physical Society
Citation
Joly, V.L. Joseph, et al. "Observation of magnetic edge state in graphene nanoribbons." Physical Review B 81.24 (2010): 245428. © 2010 The American Physical Society
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.81.245428
