On the Dielectric and Magnetic Properties of Nanocomposites

Hallouet, B.; Wetzel, B.; Pelster, R.

doi:https://doi.org/10.1155/2007/34527

Journal of Nanomaterials

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Modeling and Characterization of the Interaction of Electromagnetic Wave with Nanocomposites and Nanostructured Materials

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Volume 2007 | Article ID 034527 | https://doi.org/10.1155/2007/34527

On the Dielectric and Magnetic Properties of Nanocomposites

B. Hallouet,¹B. Wetzel,²and R. Pelster¹

Academic Editor: C. Brosseau

Received15 Feb 2007

Revised29 Jun 2007

Accepted17 Oct 2007

Published17 Dec 2007

Abstract

We investigate nanocomposites, that is, dispersions of magnetite nanoparticles in an epoxy resin, by means of broadband dielectric and magnetic spectroscopy. The molecular dynamics of the polymer matrix is altered by the nanoparticles. Due to the formation of agglomerates neither permittivity nor permeability can be described with known effective medium models. We use the spectral representation (Bergman theorem) to show that a model-free evaluation of the low-frequency permeability of the nanoparticles can be achieved by combining dielectric and magnetic data. In addition, the ferromagnetic resonance is studied experimentally. It occurs near 3 GHz and is independent of the particle concentration.

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Copyright

Copyright © 2007 B. Hallouet et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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