Autor: Blagoev, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials
Autorzy:: Cherkezova-Zheleva, Z.
Zaharieva, K.
Buchkov, K.
Blagoev, B.
Mitov, I.
Powiązania:: https://bibliotekanauki.pl/articles/1382568.pdf
Data publikacji:: 2014-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.60.-d
75.75.-c
82.80.Ej
Opis:: The presented study compares magnetic properties of Ni-doped magnetites $Ni_{0.5}^{2+}Fe_{0.5}^{2+}Fe_{2}^{3+}O_{4}$ 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.
Źródło:: Acta Physica Polonica A; 2014, 126, 4; 912-915
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Present state of Bulgarian glacierets
Autorzy:: Gachev, E.
Gikov, A.
Zlatinova, C.
Blagoev, B.
Powiązania:: https://bibliotekanauki.pl/articles/294843.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Geomorfologów Polskich
Tematy:: Pirin Mountains
glacierets
inter-annual dynamics
climate fluctuations
Opis:: he present article makes a revision of the recent studies related to Bulgarian glacierets, all located in the northern part of the Pirin Mountains, as well as presents some latest results from field measurements of firn size and morphology descriptions. This has been the first scientific study of Banski suhodol glacieret, which at present is the largest in Bulgaria. Data gained until now indicates differences between the Pirin and the High Tatras concerning the driving factors of glacieret inter-annual dynamics, as for Bulgarian glacierets air temperature appears to be one of the most sufficient controls.
Źródło:: Landform Analysis; 2009, 11; 16-24
1429-799X
Pojawia się w:: Landform Analysis
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Thin-Film Grain-Boundary Junctions on a Bi-Crystal Substrate
Autorzy:: Gierłowski, P.
Szewczyk, A.
Abal'oshev, A. V.
Vlakhov, E. S.
Donchev, T. I.
Blagoev, B.
Powiązania:: https://bibliotekanauki.pl/articles/2041462.pdf
Data publikacji:: 2004-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.47.Lx
75.47.Gk
72.25.Mk
Opis:: Transport properties of 10μm to 30μm wide grain-boundary junctions ion-etched in thin colossal magnetoresistance La$\text{}_{0. 7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ films deposited on a SrTiO$\text{}_{3}$ 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 $\text{}_{max}$)/R$\text{}_{max}$, measured at 1 kOe was -17.6% at 4.1 K.
Źródło:: Acta Physica Polonica A; 2004, 106, 5; 715-719
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Complex Impedance Investigation of Epitaxial LCMO Thin Films
Autorzy:: Mateev, E.
Nurgaliev, T.
Blagoev, B.
Powiązania:: https://bibliotekanauki.pl/articles/1205437.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.-i
72.80.Ga
72.90.+y
73.61.Le
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2014, 126, 3; 787-789
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: LSMO/YBCO heterostructures and investigation of "negative" resistance effect in the interface
Autorzy:: Sojková, M.
Nurgaliev, T.
Štrbík, V.
Chromik, Š.
Blagoev, B.
Španková, M.
Powiązania:: https://bibliotekanauki.pl/articles/1053094.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.40.-c
73.40.Cg
74.78.Fk
74.72.-h
75.50.Cc
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 842-844
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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