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    Wyświetlanie 1-12 z 12
    Tytuł:
    Effect of Magnetic Zigzag Edges in Graphene-like Nanoribbons on the Thermoelectric Power Factor
    Autorzy:
    Krompiewski, S.
    Cuniberti, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030504.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    72.25.-b
    73.50.Lw
    Opis:
    This study shows that magnetic edge states of graphene-like nanoribbons enhance effectively the thermoelectric performance. This is due to the antiparallel alignment of magnetic moments on opposite zigzag edges and the confinement effect, which jointly lead to the appearance of a gap in the electronic energy spectrum. Consequently, the Seebeck coefficient as well as the thermoelectric power factor get strongly enhanced (with respect to other alignment cases) at room temperature and energies not far away from the charge neutrality point. Moreover the corresponding figure of merit (ZT) is also improved as a result of the reduced electronic thermal conductance.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 535-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Linear Thermal Current through Multilevel Quantum Dot Coupled to Ferromagnetic Electrodes
    Autorzy:
    Wierzbicki, M.
    Świrkowicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427586.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.Hk
    73.50.Lw
    85.80.Fi
    Opis:
    We present studies of spin-dependent phenomena in the non-linear energy transport through a multilevel quantum dot/molecule in the Coulomb blockade regime. Calculations are performed within the framework of non-equilibrium Green function formalism based on the equation of motion. Thermal current flowing through the system due to temperature gradient significantly varies with gate voltage. It depends on relative orientation of magnetic moments in the electrodes, so in analogy to tunneling magnetoresistance the magnetothermal conductance is introduced, which describes the effect.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1204-1206
    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:
    Measuring of Electric Parameters of Graphene in Presence of Temperature Gradient
    Autorzy:
    Inglot, M.
    Trybus, M.
    Woś, B.
    Ciuk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402561.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.80.Fi
    73.50.Lw
    84.60.Rb
    Opis:
    Graphene is one of the most promising materials for application in electronics. It has been recently discovered that on certain substrates graphene is characterized by a rather strong spin-orbit interaction, which is valuable to spintronics applications. In this paper we present an application of a system for measuring of graphene's electrical parameters. The idea of a measuring system originates from the measurements of the pyroelectric coefficient of ferroelectric samples. After a simple modification the system can be used for various experiments related to the determination of electric response of samples exposed to a temperature gradient. Test measurements of monolayer graphene samples and their thermoelectric response are presented.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 166-169
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Heat Currents in Nanoscopic System with Ferromagnetic Electrodes of Non-Collinear Magnetic Moments
    Autorzy:
    Wierzbicki, M.
    Świrkowicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426962.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.Hk
    73.50.Lw
    85.80.Fi
    Opis:
    Thermoelectric properties of nanoscopic system composed of a single-level quantum dot attached to ferromagnetic electrodes are studied with the use of the non-equilibrium Green function formalism. Electrical and heat currents flowing through the system under temperature gradient and bias voltage are calculated in the non-linear regime. Both charge and heat currents strongly depend on configuration of magnetic moments in the leads. TMR ratio is mostly positive, but in a region of small bias voltages, where the electron flow is determined by the temperature gradient, electrical current in parallel and antiparallel configurations flows in opposite directions leading to considerable negative TMR.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1073-1075
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electroresistance of La-Ca-MnO Thin Films
    Autorzy:
    Cimmperman, P.
    Stankevič, V.
    Žurauskienė, N.
    Balevičius, S.
    Anisimovas, F.
    Paršeliūnas, J.
    Kiprijanovič, O.
    Altgilbers, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037104.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.Gr
    73.50.Lw
    73.63.Bd
    Opis:
    Epitaxial, textured, and polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$Mn O$\text{}_{3}$ films, having about 150 nm thickness, were prepared by pulsed laser deposition techniques onto (110) NdGaO$\text{}_{3}$, MgO and lucalox substrates and investigated using 10 ns duration, 0.5 ns rise time electrical pulses having amplitude up to 500 V. Electroresistance of the films [R(E)-R(0)]/R(0) was investigated up to 80 kV/cm electric field strengths in temperatures ranging from 300 K to 4.2 K. Strong (up to 93%) negative electroresistance was obtained in polycrystalline La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ films prepared on MgO and lucalox substrates. The epitaxial films grown on NdGaO$\text{}_{3}$ substrate demonstrated only a small resistance change due to Joule heating induced by a current pulse. It was concluded that electroresistance manifests itself in strongly inhomogeneous manganites films exhibiting a large number of structural imperfections producing ferromagnetic tunnel junction nets.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 107-114
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Seebeck Effect in Double Tunnel Junctions with Ferromagnetic Electrodes and Central Layer Separated by Nonmagnetic Barriers
    Autorzy:
    Wilczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030503.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Pa
    73.40.Gk
    73.40.Ty
    73.50.Lw
    Opis:
    The Seebeck effect is analysed in the double planar tunnel junctions consisting of ferromagnetic electrodes and the central layer separated by nonmagnetic barriers with the arbitrary angle between magnetic moments in neighbouring ferromagnetic layers. The Seebeck coefficient is calculated as a function of the thickness of the central layer. The influence of temperature of the junction and the relative orientation of magnetic moments in ferromagnetic layers on this coefficient is also analysed. Calculations are performed in the linear response theory using the free-electron model. It has been found that the Seebeck coefficient oscillates with the thickness of the central layer and can be strongly enhanced in the junction with special central layer thickness due to electron tunnelling by resonant states. The form of the observed oscillations depends on the temperature of the junction. The magnitude of the Seebeck coefficient usually increases with the increase of the angle between magnetic moments in the neighbouring ferromagnetic layers as in the case of single junctions. However, in the junctions with the specially designated central layer the decrease of the magnitude of the Seebeck coefficient with the increase of this angle can be observed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 544-547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Thermoelectric Effects in Transport through a Two-Level Quantum Dot Coupled to Ferromagnetic Leads
    Autorzy:
    Karwacki, Ł.
    Trocha, P.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427587.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.23.-b
    73.63.Kv
    73.50.Lw
    Opis:
    We investigate spin thermoelectric effects in a two-level quantum dot attached to external ferromagnetic leads. The basic thermoelectric coefficients are calculated by means of the non-equilibrium Green functions approach in the mean field approximation for the Coulomb term. Specifically, we calculate spin-dependent thermopower (spin Seebeck coefficient) and the charge thermopower. These coefficients measure spin and charge voltage drops across the device, respectively. Moreover, the figure of merit and its spin analog (which measures the spin thermoelectric efficiency) are presented and discussed. We also show that the indirect (via the leads) coupling between the dot's levels can significantly enhance the thermoelectric effects.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1207-1209
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermopower and Surface Magnetic Characterization of Ni Thin Layers
    Autorzy:
    Szabo, A.
    Varga, R.
    Ujhelyi, F.
    Komanicky, V.
    Zorkovska, A.
    Lovas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201858.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Jf
    73.50.Lw
    75.70.-i
    68.55.jm
    Opis:
    Thermoelectric power and surface magnetic characterization of Ni evaporated layers will be presented, with the comparison with the bulk Ni material. The bulk electrical and magnetic properties are developed gradually, approaching the bulk properties, as the layer thickness increases. Below the thickness of 180 nm, the evaporated layers are amorphous. The epitaxial stresses can appear in both, the anomaly observed in the thermopower and the surface coercivity measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 204-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mesoscopic Structures for Microwave-THz Detection
    Autorzy:
    Sužied.elis, A.
    Ašmontas, S.
    Požela, J.
    Kundrotas, J.
    Širmulis, E.
    Gradauskas, J.
    Kozič, A.
    Kazlauskaité, V.
    Anbinderis, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813189.pdf
    Data publikacji:
    2008-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Fg
    73.40.Kp
    73.50.Lw
    73.63.Kv
    Opis:
    Properties of microwave detectors of various design on the base of MBE grown GaAs and AlGaAs structures are discussed in this paper: simple asymmetrically shaped structures with heavily doped GaAs and AlGaAs layers of nanometric thickness as well as diodes with two-dimensional electron gas layers. Novel models of the detectors with partially gated two-dimensional electron gas layer as well as with small area GaAs/AlGaAs heterojuction are discussed to demonstrate different ways to increase the voltage sensitivity of the detectors of electromagnetic radiation in GHz-THz frequency range.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 3; 803-809
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Transport through a Quantum Dot Coupled to a Normal Metal and BCS Superconductor
    Autorzy:
    Krawiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812283.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.-b
    73.50.Lw
    72.15.Qm
    74.45.+c
    Opis:
    We discuss thermoelectric properties of a quantum dot coupled to one normal and one superconducting lead in the presence of the Kondo effect and the Andreev scattering. We will focus on conductance, thermal conductance, thermopower and related quantities like thermoelectric figure of merit which is a direct measure of the usefulness of the system for applications and the Wiedemann-Franz ratio which indicates if the system is in the Fermi liquid state. We will show that the superconductivity strongly modifies the thermal properties of the system. In particular, the thermopower is strongly enhanced near the superconducting transition temperature. Moreover, the Andreev reflections are suppressed due to strong on-dot Coulomb repulsion. The suppression of the Andreev reflections leads to a violation of the Wiedemann-Franz law and to a non-Fermi liquid ground state.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 115-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Some Physical Properties of Chemically Deposited Nickel Sulfide Thin Films
    Autorzy:
    Hammad, A.
    ElMandouh, Z.
    Elmeleegi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400567.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    68.37.Hk
    68.55.jd
    68.55.J-
    78.20.Ci
    78.68.+m
    73.50.Lw
    73.90.+f
    Opis:
    $Ni_2S_{2-x}$ thin films with x=0, 0.5, and 1 were prepared by chemical bath deposition technique. Amorphous structure was discovered by XRD for x=1, while α-Ni₇S₆ and NiS phases were discovered for x=0, and x=0.5 respectively. SEM graphs of the studied films have confirmed the XRD results. Optical band gap values increase from 0.845 to 0.912 eV, with increase of the composition x from 0 to 1. Activation energy values increase in the range from x=0 to x=0.5 and does not change for x=1.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 901-903
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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