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Fast Vortex Core Switching at Moderate Temperatures

100%
Lebecki K., Nowak U.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
342-344
EN
Ferromagnetic vortex core switching is investigated using micromagnetic simulations. For that the OOMMF program is used together with a temperature extension we have developed recently. This is a continuum micromagnetic approach, where the well-known Landau-Lifshitz-Gilbert equation (valid for zero temperature) is replaced by the Landau-Lifshitz-Bloch equation. In our research we simulate switching of a ferromagnetic vortex core in a flat disk (diameter 200 nm, thickness 20 nm) with material parameters that resemble permalloy. Temperatures in the range 400 K to 700 K are considered. Switching itself is caused by application of a very short oscillating magnetic pulse. Parameters used resemble conditions met in the experiment: oscillation period 141 ps (equal to the peak width) and amplitude 60 mT. Surprisingly, no large temperature- or discretization dependence is found. Reasons for that are discussed.
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Optical Properties of a Semimagnetic Quantum Well in a Proximity of a Superconducting Film

81%
Lebecki K., Kłopotowski Ł., Kossut J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 5
741-748
EN
We consider, via numerical calculations, a hybrid structure made of a semimagnetic Cd_{1-x}Mn_xTe quantum well deposited in a close proximity to superconducting niobium film. We simulate photoluminescence and the Faraday rotation spectra, modified by the presence of vortices in this type II superconductor. The magnitude of the evaluated effects is small - the vortex induced spectral line shape variation is of the order of 1% at 1 K and 0.1% at 3 K and is expected to occur mainly in the field range between 0.03 T and 0.05 T.
3
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Temperature Dependence of the Energy Gap in Cd_{1-x}Fe_{x}Se

81%
Gaj J., Nguyen K., Arciszewska M., Lebecki K.
Acta Physica Polonica A
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1991
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vol. 80
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issue 3
405-407
EN
The energy gap and magnetic susceptibility of Cd_{0.85}Fe_{0.15}Se were measured in function of temperature. Experiments showed that the magnetic contribution to the variation of the energy gap in Cd_{1-x}Fe_{x}Se is not proportional to the product of magnetic susceptibility and temperature as it has been observed in Mn^{++}-containing semiconductors.
4
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Scattering Dynamics of Free Excitons on Fe^{++} Ions in Cd_{1-x}Fe_{x}Se

71%
Gaj J., Nguyen K., Nawrocki M., Golnik A., Lebecki K.
Acta Physica Polonica A
|
1991
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vol. 80
|
issue 3
409-412
EN
Inelastic scattering of excitons on Fe^{++} ions in Cd_{1-x}Fe_{x}Se was studied by resonant Raman scattering. Polarization measurements were done using a modulation technique, allowing for the first time to determine the full polarization state of the detected light. The obtained results were compared to a simple calculation in an incoherent model of scattering on Fe^{++} ions.
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