FERROMAGNETIC RESONANCE IN MnZn FERRITE - PVC POLYMER COMPOSITE MATERIALS: THEORY AND EXPERIMENTS

Rastislav Dosoudil – Jaroslav Franek – Marianna Ušáková

   The present study is devoted to the microwave measurements performed on the manganese-zinc (MnZn) sintered ferrite with the chemical composition ≈ Mn_0.37Zn_0.57Fe_2.06O₄ and composite materials based on this ferrite in powder form and non-magnetic polyvinyl chloride (PVC) polymer matrix. The prepared composite samples had the same particle size distribution 0-250 μm but different ferrite particle concentrations: 10, 20, 30, 40, 56, 60 and 80 vol%. Ferromagnetic resonance (FMR) experiments were performed on the composite samples using an experimental set-up utilizing the principle based on the detection of microwave signal reflected from a sample under test and proportional to the absolute value of scattering parameter S₁₁ (reflection coefficient).

Keywords: ferromagnetic resonance, wave-guide, reflection coefficient, sintered ferrite, ferrite polymer composite

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