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1
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Spin-Wave Resonance in the FeBr_{2} Metamagnetic Thin Film

100%
Rudziński W.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 3
503-506
EN
The spin-wave resonance in the thin FeBr_{2} field-induced metamagnet in the paramagnetic phase with the (001) surfaces and at low temperatures is examined theoretically. It is found that the absorption spectrum is strongly affected by modifications of the surface exchange parameters. Also, the conditions for the appearance of various surface and bulk spin-wave features are discussed.
2
Content available remote

Tunnel Magnetoresistance for Phonon-Assisted Tunneling through Quantum Dots

100%
Rudziński W.
Acta Physica Polonica A
|
2008
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vol. 113
|
issue 1
587-590
EN
Spin-polarized transport through a single-level quantum dot interacting with a local phonon mode is studied in the frame of the nonequilibrium Green-function technique. It is shown that strong electron-phonon interaction gives rise to a significant current suppression, to additional resonance peaks in the differential conductance as well as to oscillations of the tunnel magnetoresistance. Also, a phonon-induced mechanism leading to a minimum in tunnel magnetoresistance at zero bias voltage is explained.
3
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Spin-Flip Transitions in Tunneling through a Quantum Dot Coupled to Ferromagnetic Electrodes

100%
Rudziński W.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 1
281-283
EN
Using nonequilibrium Green function formalism the spin-polarized electronic transport through a quantum dot coupled to ferromagnetic electrodes is studied. Arbitrary Coulomb correlations and spin-flip processes are considered in the dot, for both parallel and antiparallel magnetic configurations of the junction. It is found that spin-flip processes suppress the magnetoresistance between each pair of the threshold bias voltages, thus giving rise to sharp tunnel magnetoresistance maxima at the thresholds. The origin of additional steps in the electric current, splitting of the resonance peaks in the corresponding differential conductance as well as negative differential conductance is also discussed in the context of interplay between tunneling processes and the intradot spin-flip transitions.
4
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Andreev Reflection in Transport Through a Quantum Dot Interacting With a Polaron

64%
Bocian K., Rudziński W.
|
|
vol. 126
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issue 1
374-375
EN
Spin-dependent tunneling through a quantum dot coupled to one ferromagnetic and one superconducting electrodes is studied theoretically in the Andreev reflection (AR) regime. Spectral functions for the system are calculated in terms of the nonequilibrium Green function technique. Effects due to interplay between the Coulomb correlations on the dot and the local phonon mode in the context of the AR transmission are analyzed.
5
Content available remote

Kinetics of multi-site-occupancy adsorption at the solid/solution interfaces. The absolute rate theory approach

64%
Rudziński W., Płaziński W.
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2008
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vol. 63
130-143
EN
The kinetic approach based on the absolute rate theory and the model of a two-site-occupancy adsorption has been proposed to describe the kinetics of sorption of solute at the solid/solution interfaces. The obtained general kinetic equation reduces to the popular empirical formulas (i.e. the Lagergren equation and the pseudo-second order equation) depending on the values of physical and technical parameters which characterize the adsorption system. here, for the case when the adsorption kinetics is governed by the rate of surface reactions. The features of this general equation are shown by presenting some simple model investigations, and its applicability is tested by presenting the analysis of some experimental data reported in literature.
6
Content available remote

Thermoelectric Effect in Photon-Assisted, Spin-Polarized Tunnelling through a Quantum Dot

64%
Bocian K., Rudziński W.
Acta Physica Polonica A
|
2015
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vol. 127
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issue 2
484-486
EN
Features of electric and thermal conductance, Seebeck coefficient as well as figure of merit in tunnelling through a single level quantum dot connected to external ferromagnetic leads are investigated theoretically using the equation of motion method within the nonequilibrium Green function technique. The influence of the harmonic ac field on the transport characteristics for the considered system is discussed in detail. In particular, it is shown that the photonic field strongly modulates the Seebeck coefficient, thus resulting in multi-peak structure of figure of merit. Thermoelectric phenomenon in a hybrid junction with the dot attached to two ferromagnetic and one superconducting lead is also discussed.
7
Content available remote

Phonon-Assisted Electronic Transport through Double Quantum Dot System Coupled to Ferromagnetic Leads

64%
Trocha P., Rudziński W.
Acta Physica Polonica A
|
2013
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vol. 124
|
issue 5
843-845
EN
Phonon-assisted electronic tunneling is studied through a double quantum dot coupled in parallel to ferromagnetic electrodes. The current-voltage characteristics for the system are derived within the nonequilibrium Green function technique based on equation of motion. It is found that additional phonon-induced resonance peaks appear in the spectral function on both sides of the main resonances corresponding to the quantum dot energy levels. It is shown that the "molecular-like" resonances are reproduced in the phonon side bands in the differential conductance. A significant phonon-induced enhancement of tunnel magnetoresistance as well as tunnel magnetoresistance oscillations are also predicted.
8
Content available remote

Surface Effects in Spin-Wave Spectrum of the Semi-Infinite FeBr_{2} Field-Induced Metamagnet

64%
Rudziński W., Maciejewski W.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
433-437
EN
Surface spin waves in the layered structure of the FeBr_{2} field-induced metamagnet are studied theoretically. Surface spin-wave modes are calculated for the (001) surface and for the paramagnetic phase at low temperatures. Allowing the surface exchange parameters to deviate from the bulk values, full richness of the surface spin-wave spectra is displayed. The problem of the stability of the ground state of the system is also discussed.
9
Content available remote

Andreev Reflection in Transport through a Quantum Dot Coupled to Ferromagnetic and Superconducting Electrodes

51%
Bocian K., Rudziński W., Barnaś J.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 5-6
1201-1203
EN
Spin-dependent tunneling through a quantum dot coupled to one ferromagnetic and one superconducting electrodes is studied theoretically in the Andreev reflection regime. Electrical conductance is calculated in terms of the nonequilibrium Green function technique. Effects due to the Zeeman splitting of the dot level are analyzed in both linear and nonlinear transport regimes, and are compared with the corresponding effects due to coherent intradot spin rotation.
10
Content available remote

Spin-Dependent Phenomena in Magnetoelectronic Devices

39%
BarnaŚ J., Gmitra M., Rudziński W., Wawrzyniak M., Dugaev V., Kunert H.
Acta Physica Polonica A
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2007
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vol. 112
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issue 6
1259-1265
EN
Spin effects in electronic transport properties of artificial magnetic structures, like nanopillar spin valves, tunnel junctions, mesoscopic double-barrier junctions (single-electron transistors) are briefly discussed. Two classes of spin effects are distinguished; i.e. magnetoresistance phenomena due to magnetization rotation, and current-induced magnetic switching and magnetic dynamics.
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