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Journal of Materials Science

, Volume 42, Issue 22, pp 9480–9490 | Cite as

Enhancement of magnetic losses in hybrid polymer composites with MnZn-ferrite and conductive fillers

  • Robert Moučka
  • Alexander V. Lopatin
  • Natalia E. Kazantseva
  • Jarmila Vilčáková
  • Petr Sáha
Article

Abstract

Polymer composites (PCs) with a polyurethane (PU) matrix filled with magnetic filler (MnZn ferrite) and hybrid polymer composites (HPCs) consisting of this magnetic filler and various types of conductive fillers (carbon black, carbon fibers, aluminum powder, polypyrrole) are prepared. The matrix structure of a HPC is formed (i) by a polymer filled with conductive filler, which forms the skeleton of an infinite cluster, and (ii) by ferrite particles that are larger than conductive particles. Thus, an HPC represents an ensemble of ferrite particles each of which is surrounded by a conductive medium and can be considered as a “core–shell” structure. The development of a core–shell structure is evidenced by the lower electric percolation threshold in an HPC compared with that in PU filled with conductive filler. Magnetic and dielectric spectra of PCs and HPCs are studied in the frequency range from 1 MHz to 10 GHz. Hybrid systems exhibit a considerable enhancement of magnetic losses compared with PCs. The enhancement of magnetic losses in HPCs is due to the conduction currents that are induced in the conductive shell by a microwave magnetic field.

Keywords

Ferrite Percolation Threshold Magnetic Loss Conductive Filler Conductive Particle 

Notes

Acknowledgements

The authors acknowledge the financial support of the Ministry of Education, Youth and Sports of the Czech Republic (ME 883 KONTAKT), and the Russian Foundation for Basic Research (project no. 06-08-00145).

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Robert Moučka
    • 1
  • Alexander V. Lopatin
    • 1
    • 2
  • Natalia E. Kazantseva
    • 1
    • 2
  • Jarmila Vilčáková
    • 1
  • Petr Sáha
    • 1
  1. 1.Polymer Centre, Faculty of TechnologyTomas Bata University in ZlinZlinCzech Republic
  2. 2.Institute of Radio Engineering and ElectronicsRussian Academy of SciencesFryazino, Moscow RegionRussia

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