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Wyświetlanie 1-10 z 219
Tytuł:
Nonlinear Zeeman Splitting of Holes in Doped GaAs Heterostructures
Autorzy:
Kubisa, M.
Ryczko, K.
Jadczak, J.
Bryja, L.
Misiewicz, J.
Potemski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047934.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
Opis:
Polarization-resolved photoluminescence from two-dimensional GaAs/GaAlAs heterostructures doped with acceptors was studied in high magnetic fields. Measurements were carried out in low temperatures up to 2 K and magnetic field up to 21 T. Experiments performed in the Faraday configuration enabled to resolve hole states with different spin orientation. We observed a nonlinear behavior of valence-band g factor in strong magnetic fields. To explain obtained results, a detailed theoretical calculation was carried out based on the Luttinger model for valence-band states. We examined the spin splitting of hole levels under the influence of both external magnetic field and built-in electric field existing in doped heterostructures. Changes of hole g factor with the width of the structure and the density of two-dimensional carriers are discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 609-611
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport and Thermoelectric Properties of Magnetic Organic Structures
Autorzy:
Zberecki, K.
Świrkowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030828.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.-b
75.75.-c
Opis:
Using ab initio methods, we study transport and thermoelectric phenomena of magnetic organic chains functionalized with nitroxide groups. We predict very good thermoelectric performance of the structure, as the conventional and spin Seebeck coefficients are remarkably enhanced. Our results suggest that magnetic organic chains would have a great potential for applications in spintronic devices.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 532-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelectric Properties of Doped Zigzag Silicene Nanoribbons
Autorzy:
Zberecki, K.
Swirkowicz, R.
Barnaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1386845.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.-b
75.75.-c
Opis:
Thermoelectric properties of silicene nanoribbons doped with magnetic impurity atoms are investigated theoretically for both antiparallel and parallel orientations of the edge magnetic moments. Spin density distribution and transport parameters have been determined by ab-initio numerical methods based on the density functional theory. Doping with magnetic atoms considerably modifies the spin density distribution, leading to a ground state with a non-zero magnetic moment. Apart from this, the spin thermopower can be considerably enhanced by the impurity atoms.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 505-507
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Mediated Mn-Mn Interaction in Quantum Dots
Autorzy:
Bak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1428517.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
75.85.+t
85.75.-d
Opis:
We present a theoretical study of magnetic interaction in quantum dots with magnetic $Mn^{2+}$ in dot impurities. We show that gate voltage applied to the quantum dot shifts the centers of electron clouds. Exact formulae for the perturbed spin density allow us to derive expression for the change of the strength of the sp-d coupling. Estimations show that sp-d exchange integral is very sensitive to the gate voltage variations. Exact formulae for the change of the effective exchange integrals are derived. As the spin coded qubits are elements of the RAM memory, a part of the energy stored in magnetic coupling will be dissipated when information is written or erased. We estimate this energy and find it sufficiently large to destroy quantum coherence during quantum computing. Finally, we discuss the interdot spin coupling and show the effect of gate voltage operations on the spin intra- and interdot Ruderman-Kittel-Kasuya-Yosida coupling.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1219-1221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Bulk Alloys
Autorzy:
Przybył, A.
Pawlik, K.
Pawlik, P.
Gębara, P.
Wysłocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1387335.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.75.-c
75.75.Cd
Opis:
The aim of this paper was to study the phase constitution, magnetic properties and magnetization reversal processes in the rapidly solidified bulk (Pr,Dy)-(Fe,Co)-B alloys doped with Zr, Ti, Mn and Ni. The 3 mm outer diameter tubes samples of the $Pr₈Dy₁Fe₆₀Co₇Ni_{(6x)}MnₓB₁₄Zr₁Ti₃$ (where x = 0, 3, 6) alloys were produced by suction-casting technique. The admixture of Zr was introduced in order to improve their glass forming abilities while Dy was substituted to enhance the magnetocrystalline anisotropy of hard magnetic phase. The effect of Ni and Mn addition on the phase constitution and magnetic properties was studied in the presented work.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 579-581
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normal Modes in a Linear Chain of Nanomagnets
Autorzy:
Wal, A.
Dubiel, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1032392.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
75.75.Jn
71.70.Gm
Opis:
The dynamics of magnetization in low-dimensional systems of micromagnets has been a very interesting subject of scientific studies last years. Excitations in such systems may have forms of normal modes. The frequency of the mode can be determined with the use of analytical methods as well as of micromagnetic numerical techniques. One of the latter is the Hamiltonian dynamical matrix method. The method is an analogue of that used to determine oscillations of atoms in crystal. The advantage of it is the possibility of calculating both of all frequencies and profiles of normal modes. Excitations in a finite system can depend on the size of it, as was noticed by experimentalists. The aim of this study is an analysis of eigenstates of the chain consisting of finite numbers of nanomagnets and dependence of states on orientation of magnetic moments and external magnetic field.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 100-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-wave Instability Theory for Ferromagnetic Nanostructures
Autorzy:
Haghshenasfard, Z.
Nguyen, H.
Cottam, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189207.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.75.-c
75.78.-n
Opis:
A microscopic, or Hamiltonian-based, theory is outlined for studying the spin-wave instability thresholds of the parametric processes occurring in ferromagnetic nanostructures under conditions of pumping with a microwave field. Most previous work has concentrated on spheres or films with dimensions of order several μm or more, with the theoretical interpretation being made in terms of macroscopic (or continuum) methods. At smaller length scales, as in ultrathin films and nanowires with thickness or lateral dimensions less than about 100 nm, the discreteness of the quantized spin waves and their spatial distributions become modified, making it more appropriate to employ a microscopic approach to the nonlinear dynamics with a lattice of effective spins interacting through the magnetic dipole-dipole and exchange interactions. Effects of microwave pumping (in either the parallel or perpendicular configuration) are incorporated in calculations for the instability thresholds of the quantized spin-wave bands in different nanostructures and materials.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 192-197
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Simulations of Ferromagnetic Nanocomposites
Autorzy:
Woińska, M.
Majhofer, A.
Gosk, J.
Szczytko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1403635.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Mg
75.50.Tt
75.75.-c
Opis:
We present results of Monte Carlo simulations of a model system of Co nanoparticles in an external magnetic field. In our simulations we take into account the interaction with the external magnetic field, the energy of crystallographic anisotropy and the dipole-dipole interactions between single domain nanoparticles. We apply the standard Metropolis algorithm to a cluster of 27 randomly distributed superparamagnetic Co nanoparticles. We investigate the dependence of blocking temperature $T_{B}$ on particle and cluster size.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1019-1021
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic $Fe_3C$ Particles
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Morjan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1507060.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
75.50.Bb
75.75.-c
Opis:
Two nanopowders containing superparamagnetic $Fe_3C$ particles, superparamagnetic $Fe_3O_4//γ-Fe_2O_3$ particles and carbon black phase were synthesised by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of $Fe_3C$ was 3 nm for the first sample and 10 nm for the second sample. Mössbauer spectra measured at 27 K and zero-field cooled/field cooled curves measured down to 4 K are reported.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 766-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect Coupling Between Localized Magnetic Moments in Zero-Dimensional Graphene Nanostructures (Quantum Dots)
Autorzy:
Szałowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1201877.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Hx
75.75.-c
73.22.Pr
Opis:
The indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between on-site magnetic impurities is studied for two kinds of graphene nanoflakes consisting of approximately 100 carbon atoms, posessing either zigzag or armchair edge. The tight-binding Hamiltonian with Hubbard term is used in non-perturbative calculations of coupling between the impurities, placed at the edge of the structure. In general, for zigzag-edged nanoflakes a pronounced coupling robust against charge doping is found, while for armchair-edged structures the interaction is weaker and much more sensitive to charge doping. Also the distance dependence of indirect exchange differs significantly for both edge forms.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 236-237
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 219

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