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Complex Impedance Investigation of Epitaxial LCMO Thin Films

100%
Mateev E., Nurgaliev T., Blagoev B.
Acta Physica Polonica A
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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.
2
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Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials

88%
Cherkezova-Zheleva Z., Zaharieva K., Buchkov K., Blagoev B., Mitov I.
Acta Physica Polonica A
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2014
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vol. 126
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issue 4
912-915
EN
The presented study compares magnetic properties of Ni-doped magnetites Ni^{2+}_{0.5}Fe^{2+}_{0.5}Fe^{3+}_{2}O_{4} to magnetite (Fe_3O_4) sample. Physicochemical properties of materials were registered by means of X-ray powder diffraction, Mössbauer spectroscopy, saturation magnetization and physical properties measurement systems. It was obtained that used preparation procedures lead to synthesis of single phase spinel materials with close nanodimensional size about 8-12 nm. Mechanochemically synthesized sample shows better magnetic properties as lower blocking temperature of superparamagnetic state and minimal coercivity in comparison to other studied materials.
3
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LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

76%
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.
4
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La_{0.7}Sr_{0.3}MnO_3 Thin-Film Grain-Boundary Junctions on a Bi-Crystal Substrate

76%
Gierłowski P., Szewczyk A., Abal'oshev A., Vlakhov E., Donchev T., Blagoev B.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
715-719
EN
Transport properties of 10μm to 30μm wide grain-boundary junctions ion-etched in thin colossal magnetoresistance La_{0. 7}Sr_{0.3}MnO_3 films deposited on a SrTiO_3 bi-crystal were investigated. We have measured the current-voltage characteristics in the temperature range from 4.2 K to 300 K without applied magnetic field, as well as the magnetoresistance at magnetic fields up to±10 kOe directed parallel to the film surface, both perpendicular and parallel to the direction of current flow through the junctions. The investigated junctions have nonlinear current-voltage characteristics in this temperature range and consist of several magnetic domains. The maximum magnetoresistance (R(H)-R _{max})/R_{max}, measured at 1 kOe was -17.6% at 4.1 K.
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