NMR studies of intrinsic fields in ferromagnetic carbon (CROSBI ID 648690)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Požek, Miroslav ; Pelc, Damjan ; Marković, Igor ; Cvitanić, Tonči ; Freitas, J.C.C. ; Scopel, W.L. ; Paz, W.S. ; Bernardes, L.V. ; Cunha-Filho, F.E. ; Speglich, C. ; Araújo-Moreira, F.M.
engleski
NMR studies of intrinsic fields in ferromagnetic carbon
The prospect of carbon-based ferromagnetic materials is extremely interesting from fundamental point of view, and promising for various applications. Recently, bulk ferromagnetic graphite was produced by intro- ducing high concentrations of defects into pristine graphite, providing the opportunity to investigate the microscopic origin of carbon ferromagnetism. Here we present an investigation of the intrinsic magnetic field in ferromagnetic carbon, studied by nuclear magnetic resonance (NMR) of the carbon nuclei. The nuclear resonant frequencies without external applied fields are a measure of the local intrinsic fields, giving direct insight into the magnetism of carbon-based materials. We find a clear 13C NMR signal in magnetic graphite, persisting up to temperatures above 200 K and with all the characteristics of ferromagnetic NMR, showing that the material is indeed intrinsically magnetic. We compare our results to quantitative DFT calculations of the microscopic field, showing that the magnetism originates in polarized point defects in the graphite structure. Finally, we discuss unconventional domain dynamics in ferromagnetic graphite uncovered by dynamical NMR measurements.
NMR, graphite, ferromagnetism
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Podaci o prilogu
20-20.
2017.
objavljeno
Podaci o matičnoj publikaciji
Third regional roundtable: Refractory, process industry, nanotechnologies and nanomedicine ROSOV PINN 2017 Programme and The Book of Abstracts
Jokanović, Vukoman
Beograd: Vinča Institute of Nuclear Sciences, Belgrade, Serbia // Serbian Society for Nanotechnologies and Nanomedicine // Serbian Society for Refractory and Process Industry
978-86-921143-0-4
Podaci o skupu
Third regional roundtable: Refractory, process industry, nanotechnologies and nanomedicine Rosov pinn 2017
ostalo
01.06.2017-02.06.2017
Beograd, Srbija