| Samples containing γ-Fe2O3 (maghemite) magnetic nanoparticles dispersed at concentrations of 0.1 wt.% and 0.3 wt.% in two different polymer matrixes, poly(ether-ester) multiblock copolymers (PEN-block-PTMO) and (PTT-block-PTMO), have been prepared. The filler was in form of solid grains with typical size of 10 nm, assembled in 10 µm agglomerates. The samples have been characterized by XRD and TEM technique. The ferromagnetic resonance (FMR) measurements have been carried out at room temperature for all four samples. It was found that the magnetic nanoparticles were homogenously dispersed in the matrixes. Intense resonance absorption line with a slightly asymmetric lineshape, arising from γ-Fe2O3 has been recorded. FMR spectra of the studied samples have different intensities, resonance fields and linewidths. The resonance lines were centered in Hr=3050 to 3270 Gs magnetic field range, while the registered linewidths were in ΔH=1020 to 1090 Gs range. It has been observed that type of the matrix could play an important role in the behavior of the FMR spectra. |
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