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    Wyświetlanie 1-8 z 8
    Tytuł:
    Metal-Polymer-Metal System in the High Static Electric Field
    Autorzy:
    Radny, M.
    Karpowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892603.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Rw
    73.40.Gk
    Opis:
    The negative differential resistance phenomenon evident on current-voltage (I-V) characteristics for Al-plasma-polymerized polystyrene-Al system is described by means of the Schottky-like barrier model constructed directly from the simplified electronic band structure of an insulator.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 325-331
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong Reduction of 1/f Noise by Carbon Doping in Epitaxial Fe/MgO(100) 12~ML/Fe Magnetic Tunnel Junctions with Barrier Defects
    Autorzy:
    Herranz, D.
    Guerrero, R.
    Cascales, J.
    Aliev, F.
    Hehn, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426670.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.70.+m
    73.40.Rw
    75.70.-i
    Opis:
    We report on the strong influence of carbon doping on 1/f noise in fully epitaxial Fe/MgO(100) 12 ML/Fe magnetic tunnel junctions in comparison with undoped junctions with a large density of barrier defects. Carbon influences the relaxation of defects, the reconstruction of the interface and the symmetry transformation of interface resonance states, which are suggested to contribute to the strong reduction of the 1/f noise. Our study demonstrates that doping with light elements could be a versatile tool to improve the electron transport and noise in epitaxial magnetic tunnel junctions with a large density of barrier defects.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 981-984
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling Magnetoresistance in Ferromagnetic Junctions: Bias Dependence
    Autorzy:
    Barnaś, J.
    Lee, S. F.
    Holody, P.
    Schelp, L. F.
    Petroff, F.
    Fert, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968769.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    73.40.Rw
    75.70.-i
    Opis:
    Electron tunneling between two ferromagnetic electrodes across an insulating barrier is analysed theoretically and experimentally. The barrier is either uniform or it includes a layer of small magnetic metallic particles. Particular attention is paid to the origin of the tunneling magnetoresistance and its bias dependence, as well as to the effects due to Coulomb blockade.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 387-391
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Analysis and Transport Properties of $RuO_2$-Based Thick Film Resistors
    Autorzy:
    Gabáni, S.
    Flachbart, K.
    Pavlík, V.
    Pietriková, A.
    Gabániová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813961.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.40.Xx
    72.80.-r
    73.40.Rw
    Opis:
    $RuO_2$-based low temperature sensors appear as very good secondary thermometers, mainly in the temperature range below 4.2 K. This is due to their high temperature sensitivity and small magnetoresistance. Both properties are strongly influenced by the manufacturing process (mainly by firing temperature and firing time). In our contribution we show that the microstructure of sensors and the temperature dependence of their resistance R(T) down to 50 mK, in case when all sensors are prepared from the same paste, can be strongly influenced by change of the firing temperature from 800°C to 900°C. The paper also presents results on the X-ray microanalysis and the analysis of electrical conductivity of these sensors.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 625-628
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Effects in Planar Tunnel Junctions
    Autorzy:
    Wilczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427569.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Pa
    73.40.Gk
    73.40.Rw
    Opis:
    The thermopower and the charge current generated by the finite temperature gradient applied to ferromagnetic planar tunnel junctions are investigated in the spin-polarized free-electron-like one-band model. It has been shown that the current depends almost linearly on the temperature difference between the electrodes while the thermopower does not depend significantly on the temperature gradient. The studied quantities depend on the magnetic configuration of the junction. The form of this dependence is sensitive to the height of the barrier, but is not sensitive to the temperature difference between the electrodes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1188-1190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Local Trapping States in Organic Molecular Crystals by Method of Thermally Modulated Space-Charge Limited Current
    Autorzy:
    Muzikante, I.
    Silinsh, Ε. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933595.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    72.80.Le
    73.50.Gr
    73.61.Ph
    73.40.Rw
    Opis:
    The method of thermally modulated space-charge limited current has been used for studying local charge carrier trapping state energy spectra in vacuum evaporated thin films and Langmuir-Blodgett multilayers of different organic molecular crystals. In case of evaporated thin polycrystalline layers of pentacene four sets of local trapping states in energy range from E$\text{}_{t}$ = 0.35 to 0.06 eV were observed. In evaporated thin layers of dimethylaminobenzylidene indandione-1,3 five sets of trapping states from Ε$\text{}_{t}$ = 0.59 to 0.28 eV were detected. In the evaporated layers of indandione-1,3 pyridinium betaine only a single set of very shallow trapping states close to the conductivity level was observed. In the Langmuir-Blodgett multilayers of vanadyl phthalocyanine and indandione-1,3 pyridinium betaine the activation energy E$\text{}_{a}$ dependence on applied voltage U, E$\text{}_{a}$(U), for bulk conductivity is not step-like as in case of evaporated layers, but of rather complicated, oscillatory shape. Such character of the E$\text{}_{a}$(U) dependence may be explained by the specific quantum well structure of the Langmuir-Biodgett multilayers and spatially nonuniform trap distribution. However, for in-plane conductivity of indandione-1,3 pyridinium betaine films the E$\text{}_{a}$(U) dependence is step-like and two sets of trapping states at E$\text{}_{t}$ = 0.45 ± 0.03 eV and E$\text{}_{t}$ = 0.18 ± 0.03 eV were obtained. In case of bulk conductivity of the Langmuir-Blodgett layers the activation energy E$\text{}_{a}$ at sufficiently high electric fields drops down to zero and the charge carrier transport switches to a "trap-free" regime.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 389-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tailored Magnetic and Electric States in 3d-Metal-Insulator Films: Characterization and Applications
    Autorzy:
    Fedotova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197852.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    73.40.Rw
    73.63.Bd
    62.23.Pq
    68.37.Lp
    68.37.Og
    Opis:
    Progress in designing of new low-cost magnetoelectronic planar devices requires new artificial films combining tuneable magnetic and electric properties. In this context, metal-insulator films are prospective for synthesis of materials with tailored physical properties that could be controlled with films composition and synthesis regimes. Present overview covers the summary of recent experimental results on complimentary and systematic study of macroscopic and local magnetic properties of films using vibrating sample magnetometer and Mössbauer spectroscopy with respect to phase composition and structural analysis at nanoscale by X-ray absorption spectroscopy in the extended X-ray absorption fine structure range, transmission electron microscopy and high-resolution transmission electron microscopy. Specific relationship between films structure and resulting magnetic properties (SP relaxation, core-shell exchange interaction, perpendicular magnetic anisotropy) is considered. Effects of magnetic and electric percolation in films are discussed in correlation with synthesis regimes (atmosphere of deposition, temperature of the substrate) and films composition. Physical mechanisms and models describing magnetic and electric properties of composite films are analyzed. Finally, technological approaches are proposed for tuning films properties towards their desired combination with respect to application in designing of sensors and planar (non-coil) inductive elements.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 944-952
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Matrix onto Oxidation of Metallic Nanoparticles in Metal-Insulator Nanocomposite Films
    Autorzy:
    Fedotova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1381794.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    73.40.Rw
    73.63.Bd
    62.23.Pq
    68.37.Lp
    68.37.Og
    Opis:
    Paper reports the results of X-ray diffraction, X-ray absorption spectroscopy and the Mössbauer spectroscopy of metal-insulator films sintered in Ar+O atmosphere evidencing the difference in oxidation of FeCoZr nanoparticles embedded into $Al_2O_3$ and $Pb(ZrTi)O_3$ matrixes. It is proved that $Al_2O_3$ matrix with high resistance to oxidation favors the formation of nanoparticles with "metal core-oxide shell" structure, while fully oxidized nanoparticles are observed inside $Pb(ZrTi)O_3$ matrix.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1418-1420
    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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