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    Wyświetlanie 1-7 z 7
    Tytuł:
    Hopkinson effect in soft and hard magnetic ferrites
    Autorzy:
    Sláma, J.
    Ušáková, M.
    Šoka, M.
    Dosoudil, R.
    Jančárik, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053131.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.30.Kz
    75.30.Cr
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 762-764
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nickel/Zinc ratio and lanthanum substitution effect on structural and magnetic properties of nickel zinc ferrites
    Autorzy:
    Jančárik, V.
    Šoka, M.
    Ušáková, M.
    Harťanský, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053078.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.30.Cr
    61.05.C-
    Opis:
    Improvement of NiZn ferrites properties by means on Ni/Zn content ratio modification and by partial substitution of Fe³⁺ ions by La³⁺ ions is presented. Ni_{x}Zn_{1-x}Fe₂O₄ and Ni_{x}Zn_{1-x}La_{0.02}Fe_{1.98}O₄ samples of small particles were prepared by self-propagated combustion method. X-ray spectroscopy was used for structural analysis, temperature dependence of magnetic susceptibility was used for evaluation of chemical and phase composition. Analysis showed that pure spinel structure without secondary phase caused by La ions for all values of Ni/Zn content was present. Noticeable growth of the magnetic susceptibility at room temperature was observed with rising of Zn²⁺ ions content.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 693-695
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Magnetic and Structural Properties of Non-Stoichiometric NiZn Ferrites Prepared by Wet Method
    Autorzy:
    Grusková, A.
    Sláma, J.
    Ušáková, M.
    Šoka, M.
    Dosoudil, R.
    Degmová, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507192.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.30.Cr
    75.30.-m
    82.80.Ej
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 780-781
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Yttrium-Substituted NiZn Ferrites
    Autorzy:
    Jančárik, V.
    Ušák, E.
    Šoka, M.
    Ušáková, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367108.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.30.Cr
    75.60.-d
    74.62.Dh
    Opis:
    Polycrystalline NiZn ferrite doped with a small amount of $Y^{3+}$ ions and having the composition of $Ni_{0.42}Zn_{0.58}Y_{x}Fe_{2-x}O_{4}$, where x=0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10, was analyzed. Specimens were prepared by the ceramic method. Thermo-magnetic analysis and evaluation of hysteresis loops parameters were chosen as main examination methods in this study. Various parameters, such as Curie temperature $T_{C}$, coercive field $H_{c}$, remanent magnetic flux density $B_{r}$, hysteresis loop area and amplitude/initial permeability were studied at low frequencies.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 90-91
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Irradiation Studies of Soft Magnetic Metallic Glasses
    Autorzy:
    Pavlovič, M.
    Miglierini, M.
    Mustafin, E.
    Seidl, T.
    Ensinger, W.
    Strašík, I.
    Šoka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507011.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.30.Cr
    75.50.-y
    61.80.-x
    Opis:
    Finemet and Vitrovac® 6025 metallic glasses were irradiated by light (N) and heavy (Au and Ta) ions at different energies from 110 keV to 250 MeV/u (MeV per mass unit) and fluences from 1 × $10^{11}$ ions/$cm^2$ to 1 × $10^{17}$ ions/$cm^2$. They were analysed by the Mössbauer spectrometry and magnetic susceptibility measurements. Qualitative differences were observed between the radiation effects caused by light and heavy ions.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 754-755
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of High Energy Heavy Ions on Magnetic Susceptibility of Soft Magnetic Metallic Glasses
    Autorzy:
    Pavlovič, M.
    Miglierini, M.
    Mustafin, E.
    Seidl, T.
    Šoka, M.
    Ensinger, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366539.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Jh
    61.82.Bg
    75.30.Cr
    75.47.Np
    75.50.Kj
    Opis:
    This contribution presents experimental data concerning the influence of fast heavy ions on magnetic susceptibility of VITROVAC®6025 and VITROPERM®800 metallic glasses. Samples of magnetic ribbons were irradiated with Au, and Ta ions at 11.1 MeV/A (energy per nucleon), and U ions at 5.9 MeV/A. The irradiation fluences varied from 5×$10^{10}$ up to 1.2×$10^{13}$ ions/$cm^{2}$. Relative change of the samples' magnetic susceptibility after and before irradiation was measured and evaluated as a function of the irradiation fluence. Measurements were done with a commercial Kappa-bridge device. We observed that VITROPERM® showed less change of magnetic susceptibility in comparison with VITROVAC® and this change occurred at higher fluences. This indicates higher radiation hardness of VITROPERM® compared with VITROVAC® against high-energy heavy ions. In addition, heavier ions caused larger change of magnetic susceptibility than the lighter ones and the effect could be roughly scaled with the level of electronic stopping.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 54-55
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Properties of Nano-Sized NiZn Ferrites
    Autorzy:
    Ušák, E.
    Šoka, M.
    Ušáková, M.
    Dobročka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366899.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.50.Tt
    61.46.Df
    61.05.C-
    75.30.Cr
    75.75.-c
    Opis:
    Structural and magnetic properties (such as e.g. size of crystallites, lattice parameter, magnetic susceptibility, Curie temperature, etc.) of nano-sized $Ni_{0.33}Zn_{0.67}Fe_{2}O_{4}$ ferrites have been studied. The obtained results demonstrated that the sintering temperature is an efficient and simple tool for controlling the size of crystallite particles, thus affecting the resulting magnetic properties. Straightforward relationship between the sintering temperature and the size of crystallites was found, meanwhile no other crystalline phases than the spinel one were detected by two independent analytic methods.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 68-69
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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