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Wyszukujesz frazę "Varga, M." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Stress Dependence of the Switching Field in Glass Coated Microwires
    Autorzy:
    Komová, E.
    Varga, M.
    Varga, R.
    Vojtaník, P.
    Torrejon, J.
    Provencio, M.
    Vázquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813586.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    Opis:
    Here we present the study of the stress dependence of the switching field in amorphous glass-coated magnetic microwire of composition FeNiMoB. Samples were heat treated in the temperature range from 250°C up to 500°C in order to obtain relaxed and nanocrystalline state. As-cast microwire shows strong stress dependence of the switching field, which decreases with the temperature of annealing. The sample is almost not stress dependent after heat treatment at 425°C, because the magnetostriction vanishes. However, the strongest stress dependence was found for the microwire annealed at 400°C, just below the optimal annealing temperature to obtain the nanocrystalline state.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 135-138
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Domain Wall Propagation at Low Fields
    Autorzy:
    Kostyk, J.
    Varga, R.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366478.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Ch
    75.60.Ej
    75.78.Fg
    Opis:
    We have studied the domain wall propagation at low fields regime in thin glass-coated microwire of composition $Fe_{77.5}Si_{7.5}B_{15}$. It is shown, that power law describes domain wall dynamics at low fields. Such behaviour results from the interaction of the propagating domain wall with the defects present in the material. At high fields, the domain wall mobility becomes negative. This can be explained as a result of domain structure relaxation. The exponent q from power law, which determines the domain wall shape, has a value of 0.19 for both cases, without applied stress and with applied stress of 20 MPa. This means, that domain wall shape is flexible in both measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 30-31
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Thermal Treatment on Frequency Dependence of the Switching Field in Amorphous and Nanocrystalline FeNiMoB Microwires
    Autorzy:
    Komova, E.
    Varga, R.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507122.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.50.Tt
    Opis:
    Amorphous and nanocrystalline ferromagnetic glass-coated microwires show excellent magnetic properties that make them very suitable to be employed as sensing elements in devices for technical applications. New $Fe_{40}Ni_{38}Mo_4B_{18}$ alloy composition can be appropriate to prepare soft magnetic nanocrystalline microwires which exhibit magnetic bistability even in the nanocrystalline state. Stability of magnetic properties after different thermal treatments ($T_{a}$ = 250-425°C) and after nanocrystallization was confirmed by the switching field $H_{sw}$ measurements. The frequency dependence of the switching field was investigated. Two contributions to the domain wall switching mechanism were recognized: magnetoelastic one coming from the magnetoelastic interaction of the magnetic moments with the stresses and relaxation one coming from the structural relaxation of local defects at atomic scale. But, the relative role of both contributions has been shown to vary strongly in different stage of devitrification.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 768-769
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Magnetization Process in Bistable Amorphous and Nanocrystalline FeCoMoB Microwires
    Autorzy:
    Klein, P.
    Varga, R.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534024.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 effect of thermal treatment on the magnetic properties of amorphous and nanocrystalline $Fe_{40}Co_{38}Mo_4B_{18}$ microwires. The magnetization process was measured within the temperature interval from 80 to 425 K. Microwires shows complex temperature dependence of the switching field in amorphous state due to the presence of complex stress distribution induced during production. After nanocrystallization, the switching field depends linearly on the measuring temperature that makes such microwires ideal for sensing applications.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 809-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of the Switching Field in Nanocrystalline FeNiMoB Microwires
    Autorzy:
    Klein, P.
    Varga, R.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366629.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.60.Jk
    Opis:
    We have studied temperature dependencies of the switching field in as-cast and nanocrystalline glass-coated $Fe_{40}Ni_{38}Mo_{4}B_{18}$ microwires. The switching field shows complex temperature dependence in the as-cast state reflecting the complex stress distribution induced during annealing. The temperature dependence of the switching field depends strongly on the stage of nanocrystallization being negative for low temperatures of annealing and positive for annealing at 700 K.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 64-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Glass-Coated FeWB Microwires
    Autorzy:
    Klein, P.
    Varga, R.
    El Kammouni, R.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367044.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    Opis:
    We have studied magnetization process in amorphous bistable $Fe_{80}W_{3}B_{17 }$ microwires with reduced Curie temperature. High mechanical stresses from glass-coating, induced during production process, result in high switching field. Reducing the length of microwire, the switching field decreases as a result of reduction of magnetoelastic anisotropy. Moreover, the decrease of magnetoelastic anisotropy results in a complex temperature dependence of the switching field. On the other hand, strong variations of the switching field with temperature can be employed in miniaturised temperature sensor.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 70-71
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Current Annealing on Domain Structure in Amorphous and Nanocrystalline FeCoMoB Microwires
    Autorzy:
    Klein, P.
    Varga, R.
    Onufer, J.
    Ziman, J.
    Badini-Confalonieri, G.
    Vazquez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032776.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.60.Jk
    75.70.Kw
    75.60.Ch
    Opis:
    The influence of current annealing on the complex domain structure in amorphous and nanocrystalline FeCoMoB microwire has been studied. The thickness of radial domain structure together with the switching field of single domain wall change as a consequence of variation of complex internal stress distribution inside metallic core. Firstly, radial domain structure thickness monotonously increases with increasing annealing DC current density for amorphous state. Switching field exhibits local minimum in nanocrystalline sample annealed at 500 MA/m^2 for 10 min when the lowest thickness of outer shell (182 nm) was observed. Such annealed sample (which magnetic properties exhibit excellent temperature stability) is suitable candidate for miniaturized sensor construction for sensing the magnetic field or mechanical stress.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 681-683
    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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