FMR study of gamma-Fe2O3 magnetic nanoparticles in a multiblock poly(ether-ester) copolymer matrix

• Autorzy: Guskos, N. , Typek, J. , Maryniak, M. , Roslaniec, Z. , Petridis, D. , Kwiatkowska, M.
• Konferencja: Workshop on Functional Materials FMA 2004, Athens, Greece, 23-26 September 2005
• Języki publikacji: EN

Abstrakty

EN

Four samples containing gamma-Fe2O3 magnetic nanoparticles dispersed at a concentration of 0.1 % (samples I and I') and 0.3 % (samples II and II') in a polymer matrix have been prepared. The polymer filler was in two forms: as solid-state grains (samples I and II) and as a liquid solution in trichloromethane (samples I' and II'). The typical size of the magnetic nanoparticles was 10 nm. The samples were characterized by XRD and TEM spectroscopy. Ferromagnetic resonance (FMR) measurements were carried out at room (RT) and liquid nitrogen (LNT) temperatures for all four samples. An intense resonance absorption line from gamma-Fe2O3 was recorded, with a slightly asymmetric line shape. The FMR spectra at RT and LNT are almost the same, as could be expected for the composite matrix. For samples II and II', the resonance lines are centred at Hr = 3039(10) Gs and Hr = 3197 (10) Gs, respectively, with linewidths of deltaH = 1289(5) Gs and deltaH = 1364(5) Gs, respectively. For samples I and I', the following values of resonance line parameters were obtained: Hr = 3172(10) Gs for sample I', and Hr = 2958(10) Gs for sample I, with linewidths of deltaH = 1279(5) Gs and deltaH = 1200(5) Gs, respectively. In both cases the resonance field for samples obtained from a solid state filler is shifted to lower magnetic fields as compared to samples made from a suspension filler, which suggests stronger ferromagnetic interactions in these materials.

Słowa kluczowe

EN

magnetic nanoparticle; ferromagnetic resonance

• Czasopismo: Materials Science Poland
• Rocznik: 2005
• Tom: Vol. 23, No. 4
• Strony: 971--976
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Guskos, N.

autor

Typek, J.

autor

Maryniak, M.

autor

Roslaniec, Z.

autor

Petridis, D.

autor

Kwiatkowska, M.

• Solid State Section, Department of Physics, University of Athens, Panepistimioupoli, 15 784 Zagrafou, Athens, Greece,

Bibliografia

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