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Microwave measurements of ferrite polymer composite materials

Author(s): Rastislav Dosoudil | Jaroslav Franek | Marianna Usakova

Journal: Advances in Electrical and Electronic Engineering
ISSN 1336-1376

Volume: 3;
Issue: 2;
Start page: 227;
Date: 2004;
Original page

Keywords: Microwave | polymer | ferromagnetic resonance | material | ceramic.

The article focuses on the microwave measurements performed on the nickel-zinc sintered ferrite with the chemical formula Ni0.3Zn0.7Fe2O4 produced by the ceramic technique and composite materials based on this ferrite and a non-magnetic polymer (polyvinyl chloride) matrix. The prepared composite samples had the same particle size distribution 0-250um but different ferrite particle concentrations between 23 vol% and 80 vol%. The apparatus for measurement of the signal proportional to the absolute value of scattering parameter S11 (reflexion coefficient) is described and the dependence of measured reflected signal on a bias magnetic field has been studied. By means of experiments, the resonances to be connected with the geometry of microwave experimental set-up were distinguished from ferromagnetic resonance arising in ferrite particles of composite structure. The role of local interaction fields of ferrite particles in composite material has been discussed.
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