Observation of magnetic edge state in graphene nanoribbons
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...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/60656 https://orcid.org/0000-0001-8492-2261 |
| _version_ | 1826188585479438336 |
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| author | 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 Lopez-Urias, Florentino Botello-Mendez, Andres Terrones, Humberto Terrones, Mauricio Dresselhaus, Mildred |
| author2 | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science |
| author_facet | Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 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 Lopez-Urias, Florentino Botello-Mendez, Andres Terrones, Humberto Terrones, Mauricio Dresselhaus, Mildred |
| author_sort | Joly, V. L. Joseph |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:01:58Z |
| format | Article |
| id | mit-1721.1/60656 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:01:58Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/606562022-09-23T10:24:30Z 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 Lopez-Urias, Florentino Botello-Mendez, Andres Terrones, Humberto Terrones, Mauricio Dresselhaus, Mildred Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology. Department of Physics Dresselhaus, Mildred Dresselhaus, Mildred 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. Japan. Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Grant No. 20001006) 2011-01-18T15:42:43Z 2011-01-18T15:42:43Z 2010-05 2010-06 Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/60656 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 https://orcid.org/0000-0001-8492-2261 en_US http://dx.doi.org/10.1103/PhysRevB.81.245428 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | 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 Lopez-Urias, Florentino Botello-Mendez, Andres Terrones, Humberto Terrones, Mauricio Dresselhaus, Mildred Observation of magnetic edge state in graphene nanoribbons |
| title | Observation of magnetic edge state in graphene nanoribbons |
| title_full | Observation of magnetic edge state in graphene nanoribbons |
| title_fullStr | Observation of magnetic edge state in graphene nanoribbons |
| title_full_unstemmed | Observation of magnetic edge state in graphene nanoribbons |
| title_short | Observation of magnetic edge state in graphene nanoribbons |
| title_sort | observation of magnetic edge state in graphene nanoribbons |
| url | http://hdl.handle.net/1721.1/60656 https://orcid.org/0000-0001-8492-2261 |
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