Two different concentrations of nanocrystalline material: α-Fe/C have been prepared by carburization of nanocrystalline iron and characterized by using XRD and SEM methods. The nanoparticles were next applied as fillers in polymer nanocomposites using the polycondensation reaction (in situ) in poly(ether-ester) matrix with two different concentrations: 0.1 wt. % and 0.3 wt. %. The temperature dependence of the ferromagnetic resonance (FMR) spectra has been investigated to study magnetic interactions in the compounds. The introduced FMR parameters (intensity and position of the right peak) describe well the temperature dependence of FMR spectra of strongly interacting magnetic nanoparticles. The FMR spectra depend strongly on the concentration of magnetic nanoparticles, which influence the magnetic interactions between them. Two main critical points of the matrix (glass state and freezing of benzene rings) influence the behaviour of the FMR spectra.

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