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    Wyświetlanie 1-8 z 8
    Tytuł:
    Spin-Polarized Carrier Injection in MOCVD-Grown YBCO/STO/LSMO Heterostructures with Underlying YBCO Layer
    Autorzy:
    Vengalis, B.
    Plaušinaitiene, V.
    Abrutis, A.
    Šaltytė, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041755.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    81.15.Gh
    85.25.-j
    Opis:
    The oxide heterostructures composed of superconducting YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ bottom layer, the overlying ferromagnetic La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ film and SrTiO$\text{}_{3}$ as ultrathin (d≈5 nm) barrier were grown heteroepitaxially onto LaAlO $\text{}_{3}$ substrates by applying pulsed liquid injection metalorganic chemical vapour deposition technique. We report anomalous interface resistance increase with cooling just below superconductive transition temperature (T$\text{}_{c}$≅85 K) and enhanced suppression of supercurrent of strip-like YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ film due to spin-polarized carriers injected from the ferromagnetic manganite layer.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 286-289
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Sr Content on CMR Effect in Polycrystalline $La_{1-x}Sr_{x}MnO_{3}$ Thin Films
    Autorzy:
    Žurauskienė, N.
    Balevičius, S.
    Stankevič, V.
    Paršeliūnas, J.
    Keršulis, S.
    Abrutis, A.
    Plaušinaitienė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807950.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    75.30.Hx
    85.70.Kh
    Opis:
    The magnetoresistance of thin polycrystalline $La_{1-x}Sr_{x}MnO_{3}$ films deposited on lucalox substrate using metal organic chemical vapor deposition technique was investigated in pulsed magnetic fields up to 18 T in the temperature range 100-320 K. The influence of film preparation conditions, ambient temperature variation and Sr content is analyzed in order to determine the optimal conditions for the design of CMR-B-scalar magnetic field sensor based on thin manganite film, operating at room temperature.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1136-1138
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current Distribution in Y-Ba-Cu-O Superconducting Microbridges Containing Π-Shaped Channel for Easy Vortex Motion
    Autorzy:
    Sulcas, J.
    Steponaviciene, L.
    Jukna, A.
    Jung, G.
    Plausinaitiene, V.
    Abrutis, A.
    Gong, M.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505543.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    74.25.Sv
    74.25.F-
    74.25.Wx
    Opis:
    A mixed state in dc-biased thin films of II-type superconductors realizes the Abrikosov magnetic vortices/antivortices, which are the result of the current-self magnetic field penetration into the film at temperatures lower than its critical temperature $T_{c}$. A nucleation of vortices/antivortices at the superconducting film's edges, their motion perpendicular to the direction of biasing current, and the annihilation in the film's center originates from a current dissipation in the superconductor and expresses itself in experiments as a dc voltage. This work reports on the results of simulation of current density in a 50 μm wide, 100 μm long, and 0.3 μm thick $YBa_2Cu_3O_{7 - x}$ microbridges containing Π-shaped 5 μm wide single channel of easy vortex motion fabricated by means of laser-writing technique. Analyzing a two-dimensional-net of resistors and assuming that, due to the Meissner-Ochsenfeld effect, the magnetic flux penetration into superconducting film is nonlinear, we demonstrate that presence of a Π-shaped channel causes a non-homogeneous distribution of current in the microbridge.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 183-185
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Electrical Switching of Thin Manganite Films
    Autorzy:
    Balevičius, S.
    Kiprijanovič, O.
    Stankevič, V.
    Žurauskienė, N.
    Česnys, A.
    Tolvaišienė, S.
    Abrutis, A.
    Plaušinaitienė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813192.pdf
    Data publikacji:
    2008-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.47.Gk
    73.50.Fq
    Opis:
    The effects of strong pulsed electric field on the electrical properties of thin epitaxial $La_{0.7}Sr_{0.3}MnO_3$ films were investigated. The fast electrical switching from high resistance off-state to low resistance on-state was obtained at current densities higher than $10^6 A//cm^2$. This current was able to induce an irreversible damage of the sample in the regions at the edges of the electrodes of the film. It was demonstrated that thermal effects are responsible for appearance of delay time and asymmetrical shape of current channel in on-state, however, the fast switching from off- to on-state is a result of electronic effects appearing when critical power is reached in the film.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 3; 821-824
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto- and Electroresistance of Ultrathin Anisotropically Strained La-Sr-MnO Films
    Autorzy:
    Balevičius, S.
    Stankevič, V.
    Žurauskienė, N.
    Šimkevičius, Č.
    Paršeliūnas, J.
    Cimmperman, P.
    Abrutis, A.
    Plaušinaitienė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041723.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.30.Gw
    73.50.-h
    68.55.Jk
    Opis:
    The magnetoresistance anisotropy of ultrathin La$\text{}_{0.83}$Sr$\text{}_{0.17}$Mn O$\text{}_{3}$ films deposited on NdGaO$\text{}_{3}$ substrate by metalorganic chemical vapour deposition technique was investigated. The electric-field-induced resistance change was studied up to electric fields of 10 kV/cm using ns duration electrical pulses. It was found that in ultrathin (< 10 nm) and thin (< 50 nm) films the origin of electric-field-induced resistance change is thermal. However, the films with thicknesses of about 20 nm, exhibit negative electric-field-induced resistance change, having a pure electronic nature. This effect is explained in terms of two-layer systems with imperfections located at the interface between the layers.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 203-206
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Separation and Microwave Response of Epitaxial and Polycrystalline Manganite Films
    Autorzy:
    Ašmontas, S.
    Abrutis, A.
    Gradauskas, J.
    Lučun, A.
    Oginskis, A.
    Plaušinaitienė, V.
    Sužiedėlis, A.
    Vengalis, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037115.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    07.57.Kp
    Opis:
    The resistance, magnetoresistance, and resistance response under microwave irradiation (f=10 and 35 GHz) were measured for epitaxial and polycrystalline La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$ and La$\text{}_{0.67}$Sr$\text{}_{0.33}$MnO$\text{}_{3}$ thin films in the temperature range 78÷300 K. The microwave induced resistance increase observed for the epitaxial films in a narrow temperature range below the ferromagnetic to paramagnetic transition temperature T$\text{}_{c}$ certifies coexistence of low resistance (ferromagnetic) and high resistance (paramagnetic) regions in the manganites. Resistance of polycrystalline films decreased under microwave irradiation in a wide temperature range below T$\text{}_{c}$. The effect was explained in terms of microwave assisted hopping of carriers in high resistance regions formed at grain boundaries of the polycrystalline films.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 141-147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation Details of Vortex Density in Laser-Written Π-Shaped Channel of YBCO Bridge by Means of I-V Dependences
    Autorzy:
    Steponaviciene, L.
    Sulcas, J.
    Jukna, A.
    Jung, G.
    Plausinaitiene, V.
    Abrutis, A.
    Maneikis, A.
    Gong, M.
    Sobolewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505530.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.78.-w
    74.25.Sv
    74.25.F-
    74.25.Wx
    Opis:
    A current-self-induced magnetic field $H_{j}$, such that $H_{c1} < H_{j} < H_{c2}$ at $T < T_{c}$, penetrates a thin-film, type-II superconductor forming the Abrikosov magnetic vortex-antivortex pairs in the film's areas of weakest superconductivity. Our atomic force microscopy and scanning tunneling microscopy images confirm that in 50 μm wide, 100 μm long and 0.3 μm thick $YBa_2Cu_3O_{7 - x}$ superconducting devices magnetic flux penetrates first into a 5 μm wide, Π-shaped and partially deoxygenated (x ≈ 0.2) channel for easy vortex motion. When the Lorentz force overcomes pinning force in the channel, the flux starts to move and its drift dissipates energy inducing dc voltage. This work reports on the density of coherently moving vortices along the channel vs. temperature in range from $0.93T_{c}$ to $0.97T_{c}$. Our simulations show that the vortex density vs. temperature dependence extracted from I-V measurements of our devices follows the temperature dependence of magnetic field penetration depth and the coherence length of the superconductor.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 180-182
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thin Film Manganite-Metal Interconnection and "Loop Effect" Studies in CMR-Based High Magnetic Field Sensors
    Autorzy:
    Balevičius, S.
    Stankevič, V.
    Žurauskienė, N.
    Šimkevičius, Č.
    Liebfried, O.
    Löffler, M.
    Schneider, M.
    Abrutis, A.
    Plaušinaitienė, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807946.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    75.47.Lx
    85.70.Ay
    Opis:
    The design, technology and main characteristics of Ag contacts as well as "loop effect" peculiarities of colossal magnetoresistance B-scalar high magnetic field sensor based on $La_{1-x}(Ca)Sr_x$ $MnO_3$ films used for measuring high magnetic field pulses are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1133-1135
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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