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Magneto-Dielectric Behaviour of M-Type Hexaferrite/Polymer Nanocomposites

1
Smart Materials & Nanodielectrics Laboratory, Department of Materials Science, School of Natural Sciences, University of Patras, 26504 Patras, Greece
2
Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi, 15310 Athens, Greece
*
Author to whom correspondence should be addressed.
Materials 2018, 11(12), 2551; https://doi.org/10.3390/ma11122551
Received: 19 October 2018 / Revised: 16 November 2018 / Accepted: 11 December 2018 / Published: 14 December 2018
(This article belongs to the Special Issue New Developments in Ferromagnetic Materials)
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Abstract

In the present study two sets of nanocomposites consisting of an epoxy resin and BaFe12O19 or SrFe12O19 nanoparticles were successfully developed and characterized morphologically and structurally via scanning electron microscopy and X-ray diffraction spectra. The dielectric response of the nanocomposites was investigated by means of broadband dielectric spectroscopy and their magnetic properties were derived from magnetization tests. Experimental data imply that the incorporation of the ceramic nanoparticles enhances significantly the dielectric properties of the examined systems and their ability to store electrical energy. Dielectric spectra of all systems revealed the presence of three distinct relaxation mechanisms, which are attributed both to the polymer matrix and the nanoinclusions: Interfacial polarization, glass to rubber transition of the polymer matrix and the re-orientation of small polar side groups of the polymer chain. The magnetic measurements confirmed the ferromagnetic nature of the nanocomposites. The induced magnetic properties increase with the inclusion of hexaferrite nanoparticles. The nanocomposites with SrFe12O19 nanoparticles exhibit higher values of coercive field, magnetization, magnetic saturation and remanence magnetization. A magnetic transition was detected in the ZFC/FC curves in the case of the BaFe12O19/epoxy nanocomposites. View Full-Text
Keywords: barium ferrite; strontium ferrite; ferromagnetic nanocomposites; dielectric relaxations; magnetization; zero field cooled; field cooled; magnetic transition barium ferrite; strontium ferrite; ferromagnetic nanocomposites; dielectric relaxations; magnetization; zero field cooled; field cooled; magnetic transition
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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 (CC BY 4.0).
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MDPI and ACS Style

Sanida, A.; Stavropoulos, S.; Speliotis, T.; Psarras, G.C. Magneto-Dielectric Behaviour of M-Type Hexaferrite/Polymer Nanocomposites. Materials 2018, 11, 2551.

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