FMR Evidence of Stable Ferromagnetic Correlations at Zigzag Edge States in Graphene

We studied magnetic properties of a composite of paran and graphene akes.Magnetic properties of this composite were investigated by ferromagnetic resonance/electron spin resonance technique.The ferromagnetic resonance signal from graphene suspension in paran is broad and shifted from magnetic eld corresponding to g ≈ 2 to the low magnetic eld.The temperature dependence of the spectra shows that magnetic ordering in the studied system is sensitive to thermal uctuations.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.