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

119 Citations (Scopus)

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

Fingerprint

Nanoribbons
Carbon Nanotubes
Graphite
Graphene
graphene
Annealing
Paramagnetic resonance
Fermi level
X rays
x ray absorption
electron paramagnetic resonance
annealing
fine structure
Magnetism
Electronic states
Temperature
Electronic structure
Chemical vapor deposition
vapor deposition
electronic structure

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Joly, V. L. J., Kiguchi, M., Hao, S. J., Takai, K., Enoki, T., Sumii, R., ... 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
Joly, V. L.Joseph ; Kiguchi, Manabu ; Hao, Si Jia ; Takai, Kazuyuki ; Enoki, Toshiaki ; Sumii, Ryohei ; Amemiya, Kenta ; Muramatsu, Hiroyuki ; Hayashi, Takuya ; Kim, Yoong Ahm ; Endo, Morinobu ; Campos-Delgado, Jessica ; López-Urías, Florentino ; Botello-Méndez, Andrés ; Terrones, Humberto ; Terrones, Mauricio ; Dresselhaus, Mildred S. / Observation of magnetic edge state in graphene nanoribbons. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 24.
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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.",
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Joly, VLJ, Kiguchi, M, Hao, SJ, Takai, K, Enoki, T, Sumii, R, Amemiya, K, Muramatsu, H, Hayashi, T, Kim, YA, Endo, M, Campos-Delgado, J, López-Urías, F, Botello-Méndez, A, Terrones, H, Terrones, M & Dresselhaus, MS 2010, 'Observation of magnetic edge state in graphene nanoribbons', Physical Review B - Condensed Matter and Materials Physics, vol. 81, no. 24, 245428. https://doi.org/10.1103/PhysRevB.81.245428

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

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 24, 245428, 22.06.2010.

Research output: Contribution to journalArticle

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T1 - Observation of magnetic edge state in graphene nanoribbons

AU - Joly, V. L.Joseph

AU - Kiguchi, Manabu

AU - Hao, Si Jia

AU - Takai, Kazuyuki

AU - Enoki, Toshiaki

AU - Sumii, Ryohei

AU - Amemiya, Kenta

AU - Muramatsu, Hiroyuki

AU - Hayashi, Takuya

AU - Kim, Yoong Ahm

AU - Endo, Morinobu

AU - Campos-Delgado, Jessica

AU - López-Urías, Florentino

AU - Botello-Méndez, Andrés

AU - Terrones, Humberto

AU - Terrones, Mauricio

AU - Dresselhaus, Mildred S.

PY - 2010/6/22

Y1 - 2010/6/22

N2 - 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.

AB - 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.

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