FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene
M.A. Augustyniak-Jabłokow a, M. Maćkowiaka, K. Tadyszak b and R. Strzelczyka,b
aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
bNanoBioMedical Centre, Adam Mickiewicz University, Umultowska 8, 61-614 Poznań, Poland
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We studied magnetic properties of a composite of paraffin and graphene flakes. Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique. The ferromagnetic resonance signal from graphene suspension in paraffin is broad and shifted from magnetic field corresponding to g ≈ 2 to the low magnetic field. The temperature dependence of the spectra shows that magnetic ordering in the studied system is sensitive to thermal fluctuations. These features are expected for the 1D ferromagnetism and the obtained results are analyzed in the frame of the theoretical predictions concerning magnetic correlations at graphene edges. Therefore, based on our investigation we can conclude the existence of the magnetic edges in graphene and presence of the ferromagnetic correlations between edge spins.

DOI: 10.12693/APhysPolA.127.537
PACS numbers: 76.50.+g, 68.65.Pq