MAGNETIC NANOCOMPOSITE UNDER PRESSURE: A CASE STUDY OF Ni/C NANOPARTICLES IN POLYMER MATRIX

In this paper pressure studies of magnetic nanoparticles will be reviewed and, as a particular case, pressure influence on the ferromagnetic resonance (FMR) spectra of Ni/C nanoparticles embedded in the PBT-block-PTMO polymer will be considered. Significant variations of the FMR parameters of Ni/C nanoparticles were observed as a function of an applied external pressure at both studied temperatures (T = 142K, 293K). It has been demonstrated that the pressure dependence of the FMR parameters (the resonance field, linewidth and integrated intensity) correlates well with the temperature dependence of these parameters. Comparison with the previous similar pressure study of two different samples containing � -Fe 2 O 3 agglomerates of different sizes in the PBT-block-PTMO polymer matrix has been carried out.