TY  - JOUR
AU  - Ciric, Luka
AU  - Đokić, Dejan M.
AU  - Jacimovic, Jacim
AU  - Sienkiewicz, Andrzej
AU  - Magrez, Arnaud
AU  - Forro, Laszlo
AU  - Šljivančanin, Željko
AU  - Lotya, Mustafa
AU  - Coleman, Jonathan N.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4858
AB  - Magnetic properties of a large assembly of ultrathin graphitic particles obtained by heavy sonication of graphite powder dispersed in N-methylpyrrolidone were measured by electron-spin resonance (ESR). The ESR signal was decomposed into one narrow and one broad component. The narrow component was associated with localized Curie-type defects. The temperature dependence of the predominant broad component points to a transition to a superparamagnetic-like state at 25 K. By performing the density-functional-theory calculations for graphene with selected extended defects (the sheet edges, zigzag chains of chemisorbed H atoms, and pentagon-octagon rows), we found considerable magnetic moments at C atoms in their vicinities. We attribute the magnetism in the graphitic particles to the localized electronic states near the defects in the network of the p electrons of graphene. The ferromagnetic (FM) correlations among magnetic moments at carbon atoms near the edges are not able to give rise to a long-range FM order.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Magnetism in nanoscale graphite flakes as seen via electron spin resonance
VL  - 85
IS  - 20
DO  - 10.1103/PhysRevB.85.205437
ER  - 

@article{
author = "Ciric, Luka and Đokić, Dejan M. and Jacimovic, Jacim and Sienkiewicz, Andrzej and Magrez, Arnaud and Forro, Laszlo and Šljivančanin, Željko and Lotya, Mustafa and Coleman, Jonathan N.",
year = "2012",
abstract = "Magnetic properties of a large assembly of ultrathin graphitic particles obtained by heavy sonication of graphite powder dispersed in N-methylpyrrolidone were measured by electron-spin resonance (ESR). The ESR signal was decomposed into one narrow and one broad component. The narrow component was associated with localized Curie-type defects. The temperature dependence of the predominant broad component points to a transition to a superparamagnetic-like state at 25 K. By performing the density-functional-theory calculations for graphene with selected extended defects (the sheet edges, zigzag chains of chemisorbed H atoms, and pentagon-octagon rows), we found considerable magnetic moments at C atoms in their vicinities. We attribute the magnetism in the graphitic particles to the localized electronic states near the defects in the network of the p electrons of graphene. The ferromagnetic (FM) correlations among magnetic moments at carbon atoms near the edges are not able to give rise to a long-range FM order.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Magnetism in nanoscale graphite flakes as seen via electron spin resonance",
volume = "85",
number = "20",
doi = "10.1103/PhysRevB.85.205437"
}

Ciric, L., Đokić, D. M., Jacimovic, J., Sienkiewicz, A., Magrez, A., Forro, L., Šljivančanin, Ž., Lotya, M.,& Coleman, J. N.. (2012). Magnetism in nanoscale graphite flakes as seen via electron spin resonance. in Physical Review B: Condensed Matter and Materials Physics, 85(20).
https://doi.org/10.1103/PhysRevB.85.205437

Ciric L, Đokić DM, Jacimovic J, Sienkiewicz A, Magrez A, Forro L, Šljivančanin Ž, Lotya M, Coleman JN. Magnetism in nanoscale graphite flakes as seen via electron spin resonance. in Physical Review B: Condensed Matter and Materials Physics. 2012;85(20).
doi:10.1103/PhysRevB.85.205437 .

Ciric, Luka, Đokić, Dejan M., Jacimovic, Jacim, Sienkiewicz, Andrzej, Magrez, Arnaud, Forro, Laszlo, Šljivančanin, Željko, Lotya, Mustafa, Coleman, Jonathan N., "Magnetism in nanoscale graphite flakes as seen via electron spin resonance" in Physical Review B: Condensed Matter and Materials Physics, 85, no. 20 (2012),
https://doi.org/10.1103/PhysRevB.85.205437 . .