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1
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Spin Dynamics in Magnetic Heterostructures Driven by Current-Induced Spin-Orbit Torques

100%
Kulagin N., Korneev V., Popkov A., Demin G.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
463-465
EN
In this work it is shown that in magnetic heterostructure with the structural inversion symmetry due to the presence of the Rashba effective field responsible for the effects of spin-orbit scattering, the spin dynamics in the magnetic layer is described by a modified system of coupled equations for the exchange-coupled localized spins and spin accumulation. As a result, this system is reduced to an effective Landau-Lifshitz equation for the total magnetization with the additional torques which act similarly to the spin transfer torque in magnetic tunnel junction. Based on these equations, we calculated numerically the field dependences of the switching current density for the different magnetization geometries, in particular for that was used in work of Miron et al., which are in a good agreement with the experimental results for the reasonable fitting parameters.
2
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Temperature Dependence of Spin Hall Effect in k-Cubed Rashba Model

80%
Krzyżewska A., Dyrdał A., Berakdar J.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
558-560
EN
Within the Matsubara Green function formalism and linear response theory we considered theoretically the temperature dependences of the spin Hall effect for a two-dimensional gas with an isotropic k-cubed form of the Rashba interaction. We utilize a standard model for treating spin-orbit phenomena in p-doped semiconductor heterostructures and also for an electron gas formed at perovskite oxides interfaces.
3
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Electrical Control of Spin Relaxation Time in Complex Quantum Nanostructures

80%
Kurpas M., Kędzierska B., Janus-Zygmunt I., Maśka M., Zipper E.
Acta Physica Polonica A
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2014
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vol. 126
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issue 4a
A-20-A-25
EN
Spin related phenomena in quantum nanostructures have attracted recently much interest due to fast growing field of spintronics. In particular complex nanostructures are important as they provide a versatile system to manipulate spin and the electronic states. Such systems can be used as spin memory devices or scalable quantum bits. We investigate the spin relaxation for an electron in a complex structure composed of a quantum dot surrounded by a quantum ring. We shown that modifications of the confinement potential result in the substantial increase of the spin relaxation time.
4
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Relation between Structure and Magnetic Properties of Microstructured PrAlO_3

80%
Andrzejewski B., Pawlak D., Klimczuk T., Turczyński S.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1315-1317
EN
The magnetic properties of both the praseodymium-aluminium perovskite PrAlO_3 crystal and its microstructured version in the form of a PrAlO_3-PrAl_{11}O_{18} eutectic have been investigated. It is shown that R\overline{3}c → Imma 205 K first-order and Imma → C 2/m near 150 K second-order phase transitions in a PrAlO_3 single crystal are suppressed after structuring the material and embedding it in a PrAl_{11}O_{18} matrix. This behavior is related to the PrAl_{11}O_{18} matrix, which mechanically hinders expansion of the microrods and in this way suppresses the phase transitions.
5
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Spin-Orbit Interaction in a Spherical Quantum Dot

80%
Mikhail I., Ismail I., El Shafee M.
Acta Physica Polonica A
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2014
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vol. 125
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issue 5
1197-1205
EN
The conventional spin-orbit interaction due to the presence of an off-center impurity located in a spherical quantum dot of finite confining potential has been investigated. The different effective masses of dot and barrier are taken into consideration. The spin-orbit interaction has been calculated in the excited state (2p). The variational method has been applied by using a new form of the trial wave function in addition to the conventional form that has been used in previous work. The new form has the advantage of satisfying the boundary conditions at the interface between dot and barrier in the case of different masses. It has been shown that the spin-orbit interaction takes its highest value when the impurity is located in the vicinity of the position at which the radial electron probability takes its maximum value. The corresponding results of a central impurity has been investigated as the limiting case when the impurity radial coordinate tends to zero. The case of central impurity has been further explored by using the exact solution in the state (2p) of the radial Schrödinger equation in the presence of the impurity.
6
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Inverse Edelstein Effect: an Heuristic Derivation

80%
Raimondi R., Shen K., Vignale G.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
454-456
EN
We provide a heuristic derivation of the "Inverse Edelstein Effect" (IEE), in which a non-equilibrium spin accumulation in the plane of a two-dimensional (interfacial) electron gas drives an electric current perpendicular to its own direction. The drift-diffusion equations that govern the effect are derived and applied to the interpretation of recent experiments. A brief analysis based on the Kubo formula shows that the result is valid also outside the diffusive regime, i.e. when spin and momentum relaxation become comparable.
7
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Spin Hall and Edelstein Effects in Metallic Films

80%
Borge J., Gorini C., Vignale G., Raimondi R.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
457-459
EN
In an insulator-metal-insulator junction, inversion-symmetry breaking at the interfaces between the 3D metallic film and the top and bottom insulating layers may give rise to a sizeable (Rashba-like) spin-orbit interaction. In this paper we study the spin Hall and Edelstein effects produced by such an interface interaction through a quasiclassical approach. We find that the spin Hall conductivity has a finite value even if spin-orbit interaction with impurities in the bulk of the metallic film is neglected and disorder is properly taken into account. This is in sharp contrast with the case of a strictly 2D metallic layer, in which case impurity scattering is known to completely suppress Rashba-like contributions to the spin Hall conductivity. The non-vanishing of the latter has a profound influence on the Edelstein effect, which we show to consist of two terms, the first with the standard form valid in an exactly 2D system, and a second arising from the presence of the third dimension.
8
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Spin Hall Effect in a Two-Dimensional Electron Gas with Strong Rashba Spin-Orbit Interaction: Semiclassical Keldysh Approach

80%
Dyrdał A., Barnaś J., Ivanov V., Dugaev V.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
1059-1061
EN
Spin Hall effect in a two-dimensional electron gas with the Rashba spin-orbit interaction is analyzed theoretically. We use the Keldysh technique for nonequilibrium processes, modified in order to take into account well-defined splitting of the Fermi surface due to strong spin-orbit coupling. Using such an approach, we reconsider the two-dimensional electron gas with the Rashba spin-orbit interaction and show that impurity scattering processes suppress the spin Hall effect.
9
Content available remote

Spinning Superconductors and Ferromagnets

80%
Hirsch J.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
350-355
EN
When a magnetic field is applied to a ferromagnetic body it starts to spin (Einstein-de Haas effect). This demonstrates the intimate connection between the electron's magnetic moment μ_{B}=eħ/2m_{e}c, associated with its spin angular momentum S=ħ/2, and ferromagnetism. When a magnetic field is applied to a superconducting body it also starts to spin (gyromagnetic effect), and when a normal metal in a magnetic field becomes superconducting and expels the magnetic field (Meissner effect) the body also starts to spin. Yet according to the conventional theory of superconductivity the electron's spin only role is to label states, and the electron's magnetic moment plays no role in superconductivity. Instead, within the unconventional theory of hole superconductivity, the electron's spin and associated magnetic moment play a fundamental role in superconductivity. Just like in ferromagnets the magnetization of superconductors is predicted to result from an aggregation of magnetic moments with angular momenta ħ/2. This gives rise to a "Spin Meissner effect", the existence of a spin current in the ground state of superconductors. The theory explains how a superconducting body starts spinning when it expels magnetic fields, which we argue is not explained by the conventional theory, it provides a dynamical explanation for the Meissner effect, which we argue the conventional theory cannot do, and it explains how supercurrents stop without dissipation, which we argue the conventional theory fails to explain. Essential elements of the theory of hole superconductivity are that superconductivity is driven by lowering of kinetic energy, which we have also proposed is true for ferromagnets], that the normal state charge carriers in superconducting materials are holes, and that the spin-orbit interaction plays a key role in superconductivity. The theory is proposed to apply to all superconductors.
10
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Transmission Through Graphene Junctions with Rashba Spin-Orbit Coupling

70%
Rataj M., Barnaś J.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
481-483
EN
Electronic transport in a graphene junction is considered theoretically. Graphene is assumed to be deposited on a substrate which generates Rashba spin-orbit coupling. However, the Rashba parameters in the two parts of the junction are assumed to be generally different. Additionally, different gate voltages are applied to the two parts, which allow tuning the Fermi level and potential step. We analyze the probabilities of electron transmission through the junction and electrical conductance in the linear response regime.
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