Jaroslav Franek

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High-frequency electromagnetic wave (EM-wave) absorbing characteristics of metal alloy/spinel ferrite/polymer composite materials with various metal alloy particle contents were evaluated from measurements of complex permeability μ = μ'-jμ" by the coaxial reflection method in the frequency interval from 1 MHz to 3 GHz. We varied the(More)
The effect of partial substitutions of Zn<sup>2+</sup> ions with Cu<sup>2+</sup> and Co<sup>2+</sup> ions in Ni<sub>0.33</sub>Zn<sub>0.67</sub>Fe<sub>2</sub>O<sub>4</sub> ferrite were investigated on magnetic properties. Fine particles of Ni<sub>0.33</sub>Zn<sub>0.67-x</sub>Me<sub>x</sub>, ferrites with Me = Cu<sup>2+</sup>/Co<sup>2+</sup> were prepared by(More)
Ar metastable atoms are important energy carriers and surface interacting species in low-temperature plasmas that are difficult to quantify. Ar metastable atom densities (NAr,m) in inductively coupled Ar and Ar/H2 plasmas were obtained using a model combining electrical probe measurements of electron density (Ne) and temperature (Te), with analysis of(More)
Hybrid MnZn/NiZn/PVC polymer composite materials have been prepared using a dry low-temperature hot-pressing process and the influence of particle size, concentration, and the fraction ratio of the dual MnZn/NiZn ferrite filler on their complex permeability ¿ = ¿'-j ¿" and electromagnetic wave (EM-wave) absorbing properties were investigated within the(More)
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