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Wyświetlanie 1-7 z 7
Tytuł:
Growth and Investigation of $p-La_{2//3}Ca_{1//3}MnO_3$/n-Si Heterostructures
Autorzy:
Anisimovas, F.
Butkutė, R.
Devenson, J.
Maneikis, A.
Stankevič, V.
Pyragas, V.
Vengalis, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813391.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
73.43.Qt
75.47.Lx
81.15.Fg
Opis:
We report the fabrication and investigation of p-n diode structures based on thin hole-doped $La_{2//3}Ca_{1//3}MnO_3$ films grown on n-type silicon substrates. $La_{2//3}Ca_{1//3}MnO_3$ films with typical thickness of about 400 nm were prepared using pulsed laser deposition. Reflection high-energy electron diffraction measurements revealed polycrystalline quality of $La_{2//3}Ca_{1//3}MnO_3$ thin films on Si substrates. The surface roughness of $La_{2//3}Ca_{1//3}MnO_3$ films investigated by atomic force microscopy was found to be in the range of 25÷30 nm. Studies of electrical properties showed that $La_{2//3}Ca_{1//3}MnO_3$/Si heterostructures exhibit nonlinear asymmetric I-V characteristics both at room temperature and at 78 K. Furthemore, it was shown that these I-V dependences are sensitive to magnetic field, especially at lower voltages.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 997-1000
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reversible Resistive Switching in Electrically Nonhomogeneous $La_{0.67}Ca_{0.33}MnO_3$ Thin Films by Short Electrical Pulses
Autorzy:
Lučun, A.
Kiprijanovič, O.
Ašmontas, S.
Anisimovas, F.
Maneikis, A.
Sužied.lis, A.
Vengalis, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813407.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Gk
75.47.Lx
07.57.Kp
Opis:
Resistance changes in thin electrically nonhomogeneous $La_{0.67}Ca_{0.33}MnO_3$ films were investigated using electrical pulses of nanosecond duration in the 80-300 K temperature range. Two types of reversible switching to higher resistive states with different starting temperature induced by series of the positive pulses were observed. Possible mechanisms of the resistance switching by short electrical pulses in the vicinity of $T_m$ and at 80-90 K are discussed.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1059-1062
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Terahertz Emission from Surfaces of Cu(InGa)Se_2 Layers
Autorzy:
Koroliov, A.
Arlauskas, A.
Balakauskas, S.
Šoliūnas, M.
Maneikis, A.
Krotkus, A.
Šetkus, A.
Tamošiūnas, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399106.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Li
88.40.jn
77.55.hf
Opis:
In this contribution, we report on investigations of THz emission from $Cu(In,Ga)Se_2$ layers, deposited from a single copper-deficient sputtering target. Emission from $Cu(In,Ga)Se_2$ layer surface and from multilayer structure with transparent ZnO layers were studied. It was determined that additional undoped ZnO layer reduces the amplitude of THz emission, while additional n-type ZnO layers increase the emission amplitude again. This effect can be attributed to stronger electric field in the heterostructure between p-type $Cu(In,Ga)Se_2$ and n-type ZnO layers.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 846-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroresistance of Electrically Nonhomogeneous La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$/MgO Thin Films
Autorzy:
Kiprijanovič, O.
Lučun, A.
Ašmontas, S.
Anisimovas, F.
Butkutė, R.
Maneikis, A.
Sužiedėlis, A.
Vengalis, B.
Powiązania:
https://bibliotekanauki.pl/articles/2047239.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Gr
73.50.Lw
73.63.Bd
Opis:
Current and electrical field-induced electroresistive effects were investigated for La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$/MgO thin films demonstrating nanosized electrical inhomogeneities. Two different models based on enhanced conductivity of intergrain boundaries by injecting spin-polarized carriers from ferromagnetic grains and electrical field-enhanced hopping of carriers in high resistance intergrain media were carried out to explain nonlinear electrical properties of the films.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 141-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Investigation of Heterostructures Based on Multiferroic $BiFeO_3$
Autorzy:
Vengalis, B.
Devenson, J.
Oginskis, A.
Butkutė, R.
Maneikis, A.
Steikūnienė, A.
Dapkus, L.
Banys, J.
Kinka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813484.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
73.43.Qt
75.47.Lx
Opis:
We report heteroepitaxial growth of multiferroic $BiFeO_3$ thin films by RF magnetron sputtering on lattice-matched $SrTiO_3$ substrates, as well as preparation and electrical properties of the heterostructures formed by growing $BiFeO_3$ thin films on highly conductive $LaNiO_3$ films and n-Si substrates. Nonlinear and rectifying current-voltage (I-U) characteristics were revealed for the heterojunctions in a wide temperature range (T=78-300 K).
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 1095-1098
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:
Magnetoresistance of Polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ Films in a Microwave Magnetic Field
Autorzy:
Lučun, A.
Butkutė, R.
Maneikis, A.
Kiprijanovič, O.
Anisimovas, F.
Gradauskas, J.
Sužiedėlis, A.
Vengalis, B.
Kancleris, Ž.
Ašmontas, S.
Powiązania:
https://bibliotekanauki.pl/articles/2047240.pdf
Data publikacji:
2007-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Gk
75.47.Lx
07.57.Kp
Opis:
We present new experimental evidence indicating the importance of magnetic field component of microwave field (f=9.4 GHz) for magnetoresistive properties of polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ films. The microwave measurements revealed a different character of the temperature-dependent electrical resistance of polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ films placed in the centre (maximal amplitude of H$\text{}_{10}$ wave vector) and at a narrow wall of the wave-guide (reduced H$\text{}_{10}$ amplitude). Theoretical estimations of the influence of substrate onto distribution of microwave electric and magnetic fields in the waveguide were performed using the finite-difference time-domain method.
Źródło:
Acta Physica Polonica A; 2007, 111, 1; 147-152
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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