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    Wyświetlanie 1-9 z 9
    Tytuł:
    Coexistence of Ferromagnetism and Superconductivity in Rapidly Quenched Ni_2NbSn Heusler Alloy
    Autorzy:
    Kanuch, P.
    Ryba, T.
    Gamcová, J.
    Kanuchova, M.
    Durisin, M.
    Saksl, K.
    Vargova, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032848.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    74.25.fc
    74.25.Ha
    74.62.Bf
    74.70.Ad
    75.50.Cc
    Opis:
    We present the study on production and structural, electric and magnetic properties of superconductive Ni₂NbSn Heusler alloy. The sample has been produced by melt-spinning method using tangential speed of copper wheel 20 m/s. Polycrystalline structure has been obtained showing single phase with B2 disorder with lattice constant a=6.1654 Å. Resistance measurement shows superconductive behavior with critical temperature close to 5 K. Magnetic measurements also exhibit diamagnetic contribution from superconductive phase. Additionally, the ferromagnetic state has been observed below 20 K, which points to the coexistence of magnetic and superconducting state.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1057-1059
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Heavy-Ions on Soft-Magnetic Metallic Glasses Studied by Diffraction of Synchrotron Radiation
    Autorzy:
    Michalik, S.
    Pavlovic, M.
    Gamcova, J.
    Sovak, P.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032682.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Lk
    61.43.Dq
    Opis:
    In this work, influence of ²³⁸U swift (5.9 MeV/u) heavy ions on the as-prepared Fe-Cu-Nb-Si-B metallic glass was investigated by in situ temperature X-ray diffraction of synchrotron radiation. It was observed that ion irradiation strongly affected the temperature evolution of the parameters of the first diffuse peak. It is hypothesized that ion irradiation induced structural rearrangement that increased the degree of disorder of the amorphous structure. During heat treatment, structural relaxation and annealing out of this ion-induced degradation took place. Consequently, the original structure was recovered as demonstrated by the behaviour of the first diffuse peak broadening and devitrification process.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 657-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy
    Autorzy:
    Mino, J.
    Ipatov, M.
    Gamcova, J.
    Saksl, K.
    Durisin, M.
    Zhukova, V.
    Vargova, Z.
    Zhukov, A.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030261.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.fg
    Opis:
    Ribbons of composition Co₄₉Ni₂Ga₃₀ have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1075-1077
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Properties of Iron/Iron-Oxide Nanoparticles Prepared by Precipitation from Solid State Solution
    Autorzy:
    Milkovič, O.
    Gamcová, J.
    Sopko, M.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030258.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    Opis:
    The influence of precipitation temperature on structural and magnetic properties of iron/iron-oxide nanoparticles is investigated. Nanoparticles were prepared by precipitation of γ-Fe precipitates in Cu-Fe solid solution and subsequently isolated by matrix dissolution. Precipitation annealing temperatures were 773, 873, and 973 K. Nanoparticles core-shell structure and morphology were characterized by X-ray diffraction, high-resolution transmission electron microscopy, and selected area electron diffraction. These measurements showed that average diameter of nanoparticles increases with precipitation temperature from 8.5 nm to 20.5 nm. The measurements of magnetization as a function of temperature and applied field have been performed by SQUID magnetometer in temperature range from 5 K to 200 K.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 747-749
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Susceptibility Spectroscopy in FeNiSiB Microwires
    Autorzy:
    Olivera, J.
    Gamcova, J.
    Varga, R.
    Santos, J.
    Prida, V.
    Sanchez, M.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813592.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Jk
    Opis:
    Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated $Fe_{77.5-x}Ni_xSi_{7.5}B_{15}$ (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 155-158
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Correlation between Magnetic and Structural Properties in Ni-Ti-Zr Metallic Glass
    Autorzy:
    Lisnichuk, M.
    Katuna, Yu.
    Saksl, K.
    Girman, V.
    Gamcová, J.
    Balga, D.
    Ďurišin, M.
    Kováč, J.
    Kollár, P.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032297.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Jy
    75.50.Kj
    61.43.Dq
    Opis:
    The Ni-Ti-Zr metallic glasses are due to their known shape memory properties promising alloys e.g. for micromechanical applications. In this paper structure and structure stability of one particular alloy Ni₆₀Ti₂₅Zr₁₅ at.% were examined by means of X-ray diffraction and transmission electron microscopy while magnetic properties were ascertained by vibrating-sample magnetometer with maximal applied field of 100 kA/m in the temperature range of 300-1073 K.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 741-743
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Structural Characterization of Ni-Ti-Zr Metallic Glass
    Autorzy:
    Katuna, Yu.
    Lisnichuk, M.
    Saksl, K.
    Girman, V.
    Gamcová, J.
    Balga, D.
    Ďurišin, M.
    Kováč, J.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032136.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    68.37.Ma
    68.37.Lp
    Opis:
    Metallic glasses, in contrast to its crystalline counterparts, exhibit unique mechanical and structural properties, which make them attractive for practical applications. Especially Ni-Ti-Zr metallic glass is a promising alloy for micromechanical systems because of its known shape memory properties. Shape memory effect is connected with structural phase transformation. In this paper, the ambient-temperature-structure of Ni-Ti-Zr metallic glass is investigated using transmission electron microscopy and synchrotron X-ray diffraction, the surface and chemical analysis is documented using scanning electron microscopy. Thermal stability of the alloy has been determined using differential scanning calorimetry.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 750-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Study of Magnetization Process in Amorphous FeNiSiB Microwires
    Autorzy:
    Gamcova, J.
    Varga, R.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534004.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.60.Jk
    Opis:
    We have studied the magnetization process in amorphous $Fe_{49.6}Ni_{27.9}Si_{7.5}B_{15}$ microwire. It was found that the hysteresis mechanism consists of two contributions: magnetoelastic and structural relaxation. It was shown that at low frequencies, the magnetization process is controlled mainly by the structural relaxation. At higher frequencies (above 50 Hz), the relaxation effect disappears and switching field is determined mainly by the magnetoelastic contribution. Moreover, the effect of thermal treatment at temperature 300°C has been studied. As-cast microwire is almost unsensible to the applied tensile stress since the applied stresses are lower than that induced during production. After annealing, the stresses relax and stress sensibility of microwires increases.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 807-808
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation of magnetic fluid deformation related to nanoparticle concentration in steady electric field
    Autorzy:
    Kosterec, M.
    Kurimský, J.
    Cimbala, R.
    Špes, M.
    Farkaš, R.
    Dolník, B.
    Gamcová, M.
    Rajňák, M.
    Timko, M.
    Kopčanský, P.
    Paulovičová, K.
    Vargová, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048186.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    41.20.-q
    47.55.D-
    Opis:
    Today, it is important to know the behaviour of magnetic fluids applied in the power electrical machines, e.g. in power transformers, when exposed to an electric field. Besides their promising applications in high voltage engineering, they are of increasing interest from designed assembly and pattern formation point of view. The structure of such magnetic fluids is easily controllable by external magnetic fields. However, less attention has been paid to structural phenomena in magnetic fluids induced by electric fields. The core of this paper is dedicated to the experimental observation of a magnetic fluid droplet deformation in a steady electric field. The mutual relation between the deformation parameter and magnetic nanoparticles concentration is analysed. Spatio-temporal analysis of the droplet shape is presented in the paper. The phenomena of the droplet deformation were recorded by a camera. The detailed experimental procedure is presented. The method of deformation parameter calculation based on the linear pixel as the smallest-size unit in digital image is written. Finally, the relation between the deformation parameter and the nanoparticle volume concentration, as well as the time and magnitude of the DC field application are thoroughly evaluated. The results show that the deformation parameter decreases with increasing concentration at constant applied steady electric field but increases with increasing applied steady electric field.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 570-573
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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