| Two samples of the binary magnetic system of nanoparticles containing Fe3O4‑35% of weight, Fe3C‑29% of weight and C‑36% of weight (carbon) in PTMO - block - PET polymer at low concentrations of 0.5% and 0.3% have been prepared. The temperature dependence of the FMR resonance field has been investigated. It has shown the evidence of the matrix critical points. In all temperature ranges, especially at high temperatures, the FMR spectra are dominated by the signal from the Fe3O4 oxide. For both samples the fitting procedure has been done by using the Lorentzian lines. The influence of temperature on the FMR resonance line has an extraordinary character near the matrix critical points (mechanical or magnetic interactions). It is suggested that using the FMR method might be very fruitful in studying the critical points of the matrix or in investigations of the intermolecular interactions. |
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