Determination of the hyperfine magnetic field in magnetic carbon-based materials: DFT calculations and NMR experiments

The prospect of carbon-based magnetic materials is of immense fundamental and practical importance and information on atomic-scale features is required for a better understanding of the mechanisms leading to carbon magnetism. Here we report the first direct detection of the microscopic magnetic fiel...

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Bibliographic Details
Published in:Scientific reports 2015-10, Vol.5 (1), p.14761-14761, Article 14761
Main Authors: Freitas, Jair C. C., Scopel, Wanderlã L., Paz, Wendel S., Bernardes, Leandro V., Cunha-Filho, Francisco E., Speglich, Carlos, Araújo-Moreira, Fernando M., Pelc, Damjan, Cvitanić, Tonči, Požek, Miroslav
Format: Article
Language:English
Subjects:
140/131
639/301/119/2793
639/766/119/997
Carbon
Humanities and Social Sciences
Magnetic fields
Magnetism
multidisciplinary
NMR
Nuclear magnetic resonance
Nuclei
Science
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Summary:The prospect of carbon-based magnetic materials is of immense fundamental and practical importance and information on atomic-scale features is required for a better understanding of the mechanisms leading to carbon magnetism. Here we report the first direct detection of the microscopic magnetic field produced at 13 C nuclei in a ferromagnetic carbon material by zero-field nuclear magnetic resonance (NMR). Electronic structure calculations carried out in nanosized model systems with different classes of structural defects show a similar range of magnetic field values (18–21 T) for all investigated systems, in agreement with the NMR experiments. Our results are strong evidence of the intrinsic nature of defect-induced magnetism in magnetic carbons and establish the magnitude of the hyperfine magnetic field created in the neighbourhood of the defects that lead to magnetic order in these materials.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep14761