Agglomerated cobalt magnetic nanoparticles coated with carbon dispersed in paraffin matrix have been prepared and investigated by FMR (ferromagnetic resonance) at room temperature. Four samples with different C/Co content, ranging from 0.175 to 1.011, dispersed at low concentration in paraffin have been applied. Very intense and broad FMR spectra have been recorded for four samples with different intensities, linewidths and positions of resonance field. A strong dependence of the FMR signal intensity and position on concentration of magnetic nanoparticles has been observed. Various magnetic interactions affecting the observed FMR spectrum have been analyzed. It has been found that the magnetic dipole interaction between agglomerates is playing an important role with increasing concentrations magnetic nanoparticles.

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