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Wyświetlanie 1-10 z 22
Tytuł:
Effect of Laser Pulse Energy on the Optical Properties of Cu₂O Films by Pulsed Laser Deposition
Autorzy:
Aadim, K.
Hussain, A.
Abdulameer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401906.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Fg
Opis:
In this work copper oxide films (Cu₂O) were grown by pulsed laser deposition. The films were analyzed by X-ray diffraction and their thickness by using profilometer while the UV-VIS absorption spectra were recorded by using UV-VIS spectrometer. Pulsed Nd:YAG laser was used with varying its pulse energy, with distance between target and substrate 1 cm, and substrate temperature at room temperature, vacuum pressure was fixed at 6×10¯² mbar, number of pulses = 1000. The optical properties of as-grown film like energy gap has been measured experimentally and the effects of laser pulse energy on it were studied. There is linear relation between energy gap and pulse energy. The specific energy gap of Cu₂O film can be controlled by changing laser pulse energy and fixing other pulsed laser deposition parameter such as substrate temperature, distance between target and substrate, background pressure and number of pulses.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 419-422
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Behavior of DIN 1.2210 Steel Modified by a Pulse Plasma Technique
Autorzy:
Özbek, Y.
Gökkaya, T.
Yavaşcan, C.
Powiązania:
https://bibliotekanauki.pl/articles/1398727.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Fg
Opis:
The microstructure and wear properties of pulse plasma treated AISI 4140 steel was investigated. The surface properties of the materials have been improved by modifying the surfaces of the DIN 1.2210 steel with pulse plasma technique. The sample surfaces have been modified by pulse plasma with C₃H₈, nitrogen and O₂ gases. Two different distances between the sample and nozzle and three different numbers of pulse were determined for modification process and the surface process was implemented by using tungsten electrode with 800 µF battery capacity. The optical images were taken of the materials which the surfaces were improved by using pulse plasma technique. The surface modified samples were subjected to X-ray diffraction analysis. Wear tests were performed in a linear wear test machine with 0.15 m/s constant sliding speed under 5 N loads for 200 m sliding distance. The wear rate was changed in accordance with process parameters. The wear resistance increased in the surface modified specimens was compared to that of non-modified ones. Worn surfaces of specimens were studied by scanning electron microscope and energy dispersive spectroscopy analyses techniques. It is determined that the thickness of modification layer changes regarding to the amount of new phases and sample-nozzle distance. It is approved the increase on wear resistance related to wolfram diffusion.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 588-591
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism and structure evolution in Ni-Zn ferrites thin films - CEMS study
Autorzy:
Szumiata, T.
Gzik-Szumiata, M.
Brzózka, K.
Górka, B.
Gawroński, M.
Javed, A.
Farman, K.
Fatima, T.
Powiązania:
https://bibliotekanauki.pl/articles/1054837.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
81.15.Fg
81.05.Je
Opis:
In this work, a ⁵⁷Fe conversion electron Mössbauer spectrometry and X-ray diffraction have been utilized in order to investigate the structural and magnetic order in 500 nm thick Ni-Zn ferrite films deposited on Si(100) substrate by laser ablation. Considering the contributions of the conversion electron Mössbauer subspectra corresponding to the tetrahedral (A) and octahedral (B) sites, the spinel inversion parameter in [Zn_{x}Fe_{1-x}]^{A}[Ni_{1-x}Fe_{1+x}]^{B}O₄ films has been estimated. The hyperfine field (B_{hf}) values in the investigated Ni-Zn ferrites thin films are about 5-8% smaller than those of bulk ferrites, which could be a sign of thermal magnetic relaxations due to the size effects. The distribution of hyperfine magnetic field directions was found to be affected by perpendicular anisotropy.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 836-838
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the Superconducting Properties of Laser Ablated $YBa_2Cu_3O_{7-δ}$ Films on $CeO_2$-Buffered Sapphire
Autorzy:
Abal'osheva, I.
Zaytseva, I.
Aleszkiewicz, M.
Syryanyy, Y.
Gierłowski, P.
Abal'oshev, O.
Bezusyy, V.
Cieplak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1431267.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.-w
77.55.Px
81.15.Fg
Opis:
We use pulsed laser deposition to grow $YBa_2Cu_3O_{7-δ}$ (YBCO) superconducting films for microwave applications. The films are grown on R-cut sapphire substrates, with $CeO_2$ buffer layers, which are re-crystallized at high temperature prior to YBCO growth. Using the atomic force microscopy (AFM) and X-ray diffractometry we determine the optimal temperature for recrystallization (1000°C) and the optimal buffer layer thickness (30 nm). The properties of YBCO films of various thickness, grown on the optimized $CeO_2$ buffer layers, are studied using several methods, including AFM, magnetooptical imaging, and transport experiments. The YBCO film roughness is found to increase with the increasing film thickness, but the magnetic flux penetration in the superconducting state remains homogeneous. The superconducting parameters (the critical temperature and the critical current density) are somewhat lower than the similar parameters for YBCO films deposited on mono-crystalline substrates.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 805-807
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Characterization of $YBa_2Cu_3O_{7-δ}$ Films Deposited by Laser Ablation on $CeO_2$-Buffered Sapphire
Autorzy:
Abal'osheva, I.
Zaytseva, I.
Aleszkiewicz, M.
Malinowski, A.
Bezusyy, V.
Syryanyy, Y.
Gierłowski, P.
Abal'oshev, O.
Kończykowski, M.
Cieplak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1374756.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.-w
77.55.Px
81.15.Fg
Opis:
In this work we study the growth, by pulsed laser deposition, of $YBa_2Cu_3O_{7-δ}$ (YBCO) films on the $CeO_2$-buffered R-cut sapphire substrates, with the buffer layer recrystallized prior to the deposition of superconductor. We find that the superconducting critical temperature and the critical current density of the films are very close to similar parameters for the YBCO films grown on lattice-matched single crystalline substrates. It appears that the structural defects in the buffer layer affect the microstructure of YBCO films, resulting in high values of the critical current density, suitable for applications.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-69-A-72
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LSMO Films with Increased Temperature of MI Transition
Autorzy:
Španková, M.
Chromik, Š.
Dobročka, E.
Štrbík, V.
Sojková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1368201.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
75.47.Lx
81.15.Cd
81.15.Fg
Opis:
Epitaxial $La_{0.67}Sr_{0.33}MnO_{3}$ thin films with a significant increased temperature of metal-insulator transition (~450 K) are prepared on single crystal MgO (001) substrates using different deposition techniques - a dc magnetron sputtering or a pulsed laser deposition. The crystalline perfection of the films is characterized by X-ray diffraction technique (rocking curve measurements and reciprocal space maps). As a consequence of different methods of the film preparation we show various types of the LSMO crystal structure. Our results indicate that all the LSMO layers grown on the MgO substrate with a lattice misfit of about 8% are relaxed.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 212-213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of ZnO and ZnMnO Thin Films Obtained by Pulsed Laser Ablation
Autorzy:
Virt, I.
Hadzaman, I.
Bilyk, I.
Rudyi, I.
Kurilo, I.
Frugynskyi, M.
Potera, P.
Powiązania:
https://bibliotekanauki.pl/articles/1549722.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Dz
81.15.Fg
72.80.Ey
78.20.Ci
Opis:
The results of experimental investigation of structural and physical properties of ZnO and ZnMnO films are presented in this work. The films of ZnO and $Zn_{1-x}Mn_{x}O$ of different thickness were obtained on $Al_{2}O_{3}$, glass, and KCl substrates in vacuum of 1 × $10^{-5}$ Torr by the pulsed laser deposition method. The samples were obtained under the substrate temperature 300-473 K. A thickness of films was in the range of 0.5-1 μm depending on the number of laser pulses. The structure of target bulk materials was investigated by X-ray diffraction method. A structure of laser deposited films was investigated by the transmission high-energy electron diffraction method. Electric resistivity was measured in the temperature range 77-450 K. The presence of two activation energies in the temperature range 300-330 K and 330-450 K is followed from the analysis of the films electrical resistivity. These activation energies correspond to two deep donor's energy levels. The shallow donor's level is connected with manganese presence. Optical transmission of ZnO and ZnMnO films deposited at various temperatures were investigated.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 34-37
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Excimer Laser Irradiation Effects on Properties of Crystalline YBaCuO Thin Films
Autorzy:
Abal'oshev, A.
Abal'osheva, I.
Lewandowski, S. J.
van der Beek, C. J.
Konczykowski, M.
Rizza, G.
Barbanera, S.
Powiązania:
https://bibliotekanauki.pl/articles/2038396.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Fy
74.72.Bk
74.78.Bz
81.15.Fg
Opis:
The influence of UV laser irradiation on the physical properties of epitaxial YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ thin (<1μm) films fabricated by laser ablation was studied. The samples were irradiated by pulsed excimer laser beam at different incident energy densities E$\text{}_{ir}$≤130 mJ/cm$\text{}^{2}$, i.e. 2-3 times below the ablation threshold of YBaCuO. The analysis of the sample cross-section using transmission electron microscope shows that such irradiation forms a disordered layer on the top of the crystalline film. Sample surface amorphization was observed also by atomic force microscope. Due to strong UV irradiation absorption in YBaCuO this surface layer acts like a protective cover for the sample interior. Only a small reduction of superconducting critical temperature T$\text{}_{c}$ was observed. Both transport measurements in normal state and magneto-optical studies in superconducting state indicate that between the disordered layer and the bottom non-modified part of the film there exists a wide transitional region with reduced carrier concentration.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 681-685
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of epitaxial LSMO films grown on STO substrates
Autorzy:
Španková, M.
Štrbík, V.
Chromik, Š.
Zheng, D.
Li, J.
Machajdík, D.
Kobzev, A.
Plecenik, T.
Sojková, M.
Powiązania:
https://bibliotekanauki.pl/articles/1054697.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
75.47.Lx
75.70.Ak
81.15.Fg
Opis:
Epitaxial manganite La_{0.67}Sr_{0.33}MnO₃ (LSMO) layers, with a thickness of 20-50 nm, are prepared on single crystal (001) SrTiO₃ (STO) substrates by pulsed laser deposition technique. Structural characterization (composition analysis, surface morphology), investigated by the Rutherford backscattering spectroscopy and atomic force microscopy, reveals the growth of stoichiometric LSMO films with a smooth surface (root-mean-square value of 0.21-1.6 nm). The prepared LSMO films possess high Curie temperature ( ≈ 412 K), low room temperature resistivity (1-2 mΩ cm) and maximum of temperature coefficient of resistivity TCR = 2.7% K¯¹ at 321 K.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 848-850
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Investigation of $p-La_{2//3}Ca_{1//3}MnO_3$/n-Si Heterostructures
Autorzy:
Anisimovas, F.
Butkutė, R.
Devenson, J.
Maneikis, A.
Stankevič, V.
Pyragas, V.
Vengalis, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813391.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.30.+h
73.43.Qt
75.47.Lx
81.15.Fg
Opis:
We report the fabrication and investigation of p-n diode structures based on thin hole-doped $La_{2//3}Ca_{1//3}MnO_3$ films grown on n-type silicon substrates. $La_{2//3}Ca_{1//3}MnO_3$ films with typical thickness of about 400 nm were prepared using pulsed laser deposition. Reflection high-energy electron diffraction measurements revealed polycrystalline quality of $La_{2//3}Ca_{1//3}MnO_3$ thin films on Si substrates. The surface roughness of $La_{2//3}Ca_{1//3}MnO_3$ films investigated by atomic force microscopy was found to be in the range of 25÷30 nm. Studies of electrical properties showed that $La_{2//3}Ca_{1//3}MnO_3$/Si heterostructures exhibit nonlinear asymmetric I-V characteristics both at room temperature and at 78 K. Furthemore, it was shown that these I-V dependences are sensitive to magnetic field, especially at lower voltages.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 997-1000
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 22

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