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1
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Modeling of the Surface Impedance of Conductive Ferromagnetic Films on Different Substrates

100%
Nurgaliev T.
Acta Physica Polonica A
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2008
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vol. 113
|
issue 1
187-190
EN
The microwave surface impedance of conductive ferromagnetic films hypothetically deposited on dielectric, metal and superconducting substrates was numerically investigated for the case when the film is tangentially magnetized. It was shown that the surface impedance is governed by the ferromagnetic film conductivity if the film is thin enough. Peculiarities of the impedance caused by the ferromagnetic resonance arise more clearly in thicker ferromagnetic films or in films deposited on substrates of higher permittivity or on metal and superconducting substrates. A ferromagnetic film strongly affects the surface impedance of superconducting material, especially, in the ferromagnetic resonance frequency region.
2
Content available remote

Complex Impedance Investigation of Epitaxial LCMO Thin Films

51%
Mateev E., Nurgaliev T., Blagoev B.
Acta Physica Polonica A
|
2014
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vol. 126
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issue 3
787-790
EN
Epitaxial La_{0.67}Ca_{.33}MnO_3 (LCMO) thin films by off-axis magnetron sputtering were deposited on SrTiO_3 (STO) substrates. Complex impedance measurements (module and phase of the thin film impedance) in frequency range 1-30 kHz are done. Substantial dependence of both: module and phase of the complex surface impedance is observed. The temperature interval scanned is from 77 K to room temperature. The impedance has inductive behavior for temperatures less than the Curie temperature and capacitive for higher temperatures. Reduction of the film thickness from 60 to 30 nm shifts the impedance curves to the lower temperatures.
3
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Temperature Dependence of Magnetization Reversal of Thin Manganite Film

51%
Uspenskaya L., Nurgaliev T., Miteva S.
Acta Physica Polonica A
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2010
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vol. 117
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issue 1
207-210
EN
The magnetic domain structure, its transformation with temperature, and the magnetization reversal in 20 nm La_{0.7}Sr_{0.3}MnO_{3} film grown on LaAlO_{3} substrate by off-axis magnetron sputtering at 700°C and post-annealed at 600°C were studied in a wide temperature range. The magnetic domains with either in-plane- or out-of-plane-orientation of the vector of spontaneous magnetization were observed in the same film depending on the prehistory. The domains with the in-plane magnetization were found to be more stable. Magnetization reversal of the film was shown to occur via the nucleation and motion of 180-degree head-to-head domain walls, the number and the type of which were found to be dependent on temperature. Moreover, the transition between two magnetization reversal regimes was found at 30 K.
4
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LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

39%
Sojková M., Nurgaliev T., Štrbík V., Chromik Š., Blagoev B., Španková M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
842-844
EN
Samples containing the ferromagnetic manganite La_{0.67}Sr_{0.33}MnO₃ (LSMO) and high temperature superconducting YBa₂Cu₃O₇ (YBCO) single thin film areas and YBCO/LSMO bilayer area were prepared on LaAlO₃ (LAO) substrates and were used for investigation of the electrical properties of the interface. The measurements in the YBCO/LSMO interface demonstrated "negative" values of the resistance. A good interpretation of the obtained results was performed in the framework of a 1D model, which took into account the resistance of the interface R_{if} and the temperature dependence of the resistance of YBCO and LSMO films. It was shown that the effect of "negative" resistance arises because of the redistribution of the measuring electrical current in the interphase area if the resistance of the interface R_{if} is small in comparison with the resistances of the neighboring electrodes.
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