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

Jair C.C. Freitas; Wanderlã L. Scopel; Wendel S. Paz; Leandro V. Bernardes; Francisco E. Cunha-Filho; Carlos Speglich; Fernando M. Araújo-Moreira; Damjan Pelc; Tonči Cvitanić; Miroslav Požek

doi:10.1038/srep14761

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

Jair C.C. Freitas, Wanderlã L. Scopel, Wendel S. Paz, Leandro V. Bernardes, Francisco E. Cunha-Filho, Carlos Speglich, Fernando M. Araújo-Moreira, Damjan Pelc, Tonči Cvitanić, Miroslav Požek

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18 Scopus citations

Abstract

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 (18-21T) 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.

Original language	English (US)
Article number	14761
Journal	Scientific reports
Volume	5
DOIs	https://doi.org/10.1038/srep14761
State	Published - Oct 5 2015
Externally published	Yes

Bibliographical note

Funding Information:
We thank Damir Pajić (from the Laboratory for magnetic measurements at the University of Zagreb) for the SQUID magnetization measurements. JCCF and WLS are grateful to Prof. Tito Bonagamba (from the Physics Institute of São Carlos, University of São Paulo, Brazil) for his help with the development of the computational infrastructure used in this work. The work has been partially supported by Croatian Science Foundation (HRZZ) under the project 2729. The financial support from the agencies FAPES, FAPESP, FINEP, CAPES and CNPq (Brazil) is also gratefully acknowledged.

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

abstract = "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 (18-21T) 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.",

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note = "Funding Information: We thank Damir Paji{\'c} (from the Laboratory for magnetic measurements at the University of Zagreb) for the SQUID magnetization measurements. JCCF and WLS are grateful to Prof. Tito Bonagamba (from the Physics Institute of S{\~a}o Carlos, University of S{\~a}o Paulo, Brazil) for his help with the development of the computational infrastructure used in this work. The work has been partially supported by Croatian Science Foundation (HRZZ) under the project 2729. The financial support from the agencies FAPES, FAPESP, FINEP, CAPES and CNPq (Brazil) is also gratefully acknowledged.",

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AU - Freitas, Jair C.C.

AU - Scopel, Wanderlã L.

AU - Paz, Wendel S.

AU - Bernardes, Leandro V.

AU - Cunha-Filho, Francisco E.

AU - Speglich, Carlos

AU - Araújo-Moreira, Fernando M.

AU - Pelc, Damjan

AU - Cvitanić, Tonči

AU - Požek, Miroslav

N1 - Funding Information: We thank Damir Pajić (from the Laboratory for magnetic measurements at the University of Zagreb) for the SQUID magnetization measurements. JCCF and WLS are grateful to Prof. Tito Bonagamba (from the Physics Institute of São Carlos, University of São Paulo, Brazil) for his help with the development of the computational infrastructure used in this work. The work has been partially supported by Croatian Science Foundation (HRZZ) under the project 2729. The financial support from the agencies FAPES, FAPESP, FINEP, CAPES and CNPq (Brazil) is also gratefully acknowledged.

PY - 2015/10/5

Y1 - 2015/10/5

N2 - 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 (18-21T) 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.

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

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