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1
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Complex Permeability of LiZn/MnZn/PVC Composite Materials

100%
Dosoudil R., Ušáková M., Grusková A., Sláma J.
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issue 5
1049-1050
EN
The effect of particle content, size, and the fraction ratio of the double LiZn/MnZn ferrite filler in hybrid LiZn/MnZn/PVC composites on the frequency dispersion of complex permeability has been studied in the 1 MHz-3 GHz frequency range. The obtained relaxation type of permeability dispersion is due to the domain wall resonance, the natural ferromagnetic resonance, and the relaxation of magnetization rotation. The permeability and resonance/relaxation frequency of composites seem to be strongly affected by the change of particle content and fraction ratio of the double ferrite filler rather than by particle size.
2
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Optimization of Magnetic and Structural Properties of Sr Ferrite Prepared by Low-Temperature Combustion

100%
Grusková A., Jančárik V., Sláma J., Ušáková M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
557-560
EN
Fine strontium hexaferrite particles were prepared by the low temperature auto-combustion method. Aqueous solution of the corresponding metal salts and a combustible co-reactant compound - glycine were used as initial precursor. The resulting powders were calcined at various temperatures from 750°C up to 1100°C. The microstructure and magnetic properties were investigated by the Mössbauer spectroscopy, thermomagnetic analysis, scanning electron microscopy, and vibrating magnetometer. The particles of sizes less than 1 μm have monophasic hexagonal structure. Coercivity H_c≈400 kA/m, specific saturation polarization J_{s-m} ≈ 72×10^{-6} Tm^3 kg^{-1} and remanence polarization J_{s-r} ≈ 43×10^{-6} T m^3 kg^{-1} were achieved for the Sr ferrite annealed at 850°C for 6 h.
3
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Effect of Filler Mixture Ratio on Permeability of Multicomponent Soft Magnetic Composites

100%
Dosoudil R., Ušáková M., Grusková A., Sláma J.
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vol. 126
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issue 1
404-405
EN
Composites with hybrid LiZnTi ferrite/FeSiAl alloy filler and PVC polymer matrix were synthesized by thermal pressing process. The influence of the mixture ratio of hybrid filler on the frequency dispersion of complex permeability of the composites has been studied. The dispersion of permeability varied from resonance type to relaxation one with the configuration change from LiZnTi/PVC composite to FeSiAl/PVC one and was mainly due to the magnetic resonance phenomena such as domain wall and spin precession resonance and due to the eddy current effect.
4
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Frequency Variation of Complex Permeability in Dual Ferrite Filler - Single Polymeric Matrix Composites

100%
Dosoudil R., Ušáková M., Sláma J., Grusková A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
621-624
EN
The frequency dependences of complex initial permeability for triple-component composite materials based on two different types of ferrite filler (MnZn and NiZn ferrite) and a nonmagnetic polymeric matrix (PVC) were studied in the frequency range of 10 kHz-1 GHz. The frequency dispersion of permeability is discussed by means of a dynamic model based on the superposition of the two types of magnetic resonance, the resonance of vibrating domain walls and the resonance of precessing magnetic moments in domains.
5
Content available remote

Hopkinson Effect in Soft and Hard Magnetic Ferrites

88%
Sláma J., Ušáková M., Šoka M., Dosoudil R., Jančárik V.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
762-764
EN
The dependences of the susceptibility of selected spinel and hexagonal ferrites on temperature are analyzed. The susceptibility shows a peak just below the Curie temperature T_{C} due to the Hopkinson effect during the heating. The appearance of this effect is associated with a transition from the region of stable magnetization state to superparamagnetic relaxations of the magnetic particles. It is in contrast to other explanations of the Hopkinson effect. These results are compared with measured particles size and with scanning electron microscope micrographs of both types of ferrites.
6
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Magnetic Properties of Divalent (Ni,Sn,Zn)- Tetravalent (Ru,Sn) Ionic Mixtures of Substituted Ba Ferrite

88%
Sláma J., Grusková A., González Angeles A., Šoka M., Dosoudil R.
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vol. 126
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issue 1
172-173
EN
The drop of coercivity, while preserving the saturation magnetic polarisation J_{S} of substituted M-type Ba hexaferrites with composition BaFe_{12-2x}(Me_{1}Me_{2})_{x}O_{19}, was studied. Divalent Me_{1}=Ni, Zn, Sn and tetravalent Me_{2}=Ru, Sn ionic combinations were used in various compounds. Mössbauer spectroscopy was used to reveal sites of replacement of the Fe^{3+} ions by Ru^{4+} and Sn^{4+}. The Ni^{2+}, Zn^{2+} and Sn^{2+} occupation sites were identified as well. Strong drop of coercivity difference Δ H_{c}(x) near x=0.1 and slight decrease of Δ H_{c}(x) close to x=0.3 was obtained for suitable coupling of Me_{1}^{2+ }and Me_{2}^{4+} ions.
7
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Electromagnetic Properties of Substituted Barium Hexaferrites

88%
Sláma J., Grusková A., Jančárik V., Štofka M., González-Angeles A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
609-612
EN
Substituted M-type ferrite BaFe_{12-2x}(Me_1Me_2)_xO_{19}, 0≤x≤0.6 was prepared by both mechanical alloying and precursor method, where Me_1 = Co, Ni, Zn, Sn and Me_2 =Ru, Ti, Zr, Sn. Magnetic phase purity, change of saturation polarization, Curie temperature, coercivity and magnetic susceptibility was studied as function of x. Attention was focused to results obtained for (NiRu)_x, (ZnRu)_x, and (SnRu)_x mixtures with low doping ratio x.
8
Content available remote

Study of Magnetic and Structural Properties of Non-Stoichiometric NiZn Ferrites Prepared by Wet Method

76%
Grusková A., Sláma J., Ušáková M., Šoka M., Dosoudil R., Degmová J.
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issue 5
780-781
EN
An iron-deficient (Ni_{0.33}Zn_{0.67})_{1 + x}Fe_{2 - x}O_4 and stoichiometric Ni_{0.45}Zn_{0.55}Fe_2O_4 prepared by a wet method were studied using the Mössbauer spectroscopy and thermomagnetic measurements. For the iron-deficient sample the T_{C} is twice as large and the temperature coefficient of initial permeability is two orders of magnitude lower in comparison with the stoichiometric samples. The results are supplemented by the frequency dependence of the complex permeability.
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