Structure and Magnetic Proporties of Polymer Matrix Nanocomposites

M. Ławeckaa, M. Leonowicza, M. Kopcewiczb, A. Ślawska-Waniewskac, J. Kozubowskia, G.I. Dzhardimalievad, A.S. Rosenbergd and A. Pomogailod aFaculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland bInstitute of Electronic Materials Technology, Warsaw, Poland cInstitute of Physics, Polish Academy of Sciences, Warsaw, Poland dInstitute of Problems of Chemical Physics, Russian Academy of Sciences Chernogolovka, Russia

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Structure and magnetic properties of the thermal decomposition products of Fe(III)Co(II) acrylate complex were analysed. The crystalline phases, which were found in the fully processed material, at 643 K, were Fe3O4, CoFe2O4, and CoO and had a mean particle size of about 30 nm. In the intermediate stages of the thermolysis iron was present in a form of FeIII (trivalent low-spin iron), Fe2+ (divalent high-spin iron), and Fe3O4. The coercivity and remanence were measured versus temperature in the range of 5--300 K, in 1.1 T applied field. Both, MHc and Mr, decreased showing room temperature values of 0.038 T and 7.49 mT, for coercivity and remanence, respectively. At temperatures below 200 K the hysteresis loops were asymmetrical, opened and shifted towards negative field values.

DOI: 10.12693/APhysPolA.102.317 PACS numbers: 81.07.Bc, 82.35.Np