Abstract
the article discusses the electromagnetic absorbing and shielding properties of ferrite-polymer composites of the composition Mn–Zn ferrite/fluoroplast-42, obtained by pressing a mixture of powders with heating. The measurement of the complex magnetic and dielectric permittivity spectra, as well as the reflection coefficient spectra was carried out in the frequency range 0.1–7 GHz. Using the obtained spectra, a comprehensive analysis of the absorbing characteristics of the composites was carried out, and the factors responsible for the absorption were determined. Fitting of the composites magnetic permeability spectra show that the process of natural ferromagnetic resonance prevails over the resonance of domain walls, and a decrease in the concentration of ferrite inclusions leads to a significant shift in the frequency of natural ferromagnetic resonance to high frequencies. It was found that for composites with a thickness of 5–10 mm, compositions with a mass fraction of ferrite ≤ 0.4 show radio-absorbing properties, while compositions with a fraction of ≥0.6 show shielding properties.
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This study was supported by a grant from the Russian Science Foundation (agreement 19-19-00694 dated 06.05.2019).
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Isaev, I.M., Kostishin, V.G., Shakirzyanov, R.I. et al. Radar Absorbing and Shielding Characteristics in Ferrite-Polymer Composites Mn-Zn Ferrite/P (TFE-VDF). Tech. Phys. 68 (Suppl 3), S552–S561 (2023). https://doi.org/10.1134/S106378422390084X
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DOI: https://doi.org/10.1134/S106378422390084X