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    Wyświetlanie 1-15 z 15
    Tytuł:
    Optical Properties of ZnCoO Films and Nanopowders
    Autorzy:
    Wolska, E.
    Łukasiewicz, M.
    Fidelus, J.
    Łojkowski, W.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791349.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    78.55.Et
    81.07.Wx
    61.72.uf
    78.66.Hf
    Opis:
    ZnCoO is one of the most studied and promising semiconductor materials for spintronics applications. In this work we discuss optical and electrical properties of ZnCoO films and nanoparticles grown at low temperature by either atomic layer deposition or by a microwave driven hydrothermal method. We report that doping with cobalt quenches a visible photoluminescence of ZnO. We could observe a visible photoluminescence of ZnO only for samples with very low Co fractions (up to 1%). Mechanisms of photoluminescence quenching in ZnCoO are discussed. We also found that ZnO films remained n-type conductive after doping with Co, indicating that a high electron concentration and cobalt 2+ charge state can coexist.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 918-920
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synchrotron Photoemission Study of Ferromagnetic (Zn,Co)O Films
    Autorzy:
    Guziewicz, E.
    Lukasiewicz, M.
    Wachnicki, L.
    Kopalko, K.
    Dłużewski, P.
    Jakiela, R.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492604.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.At
    75.50.Pp
    81.05.Dz
    81.15.Gh
    Opis:
    The electronic structure of ferromagnetic (Zn,Co)O films was investigated by resonant photoemission across the Co 3p → Co 3d photoionization threshold, e.g. using photon energy between 50 eV and 66 eV. The films were grown by atomic layer deposition at temperature between 160C and 300C and they differed in distribution and content of cobalt. The maximum of the Fano resonance was observed at photon energy 63 eV, whereas the minimum at 58 eV. The difference between energy distribution curves taken at 63 eV and the one taken at 58 eV was calculated for a series of samples. It shows that the Co 3d contribution to the valence band electronic structure of ferromagnetic (Zn,Co)O films differs significantly from that of the films which show the paramagnetic response.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-040-A-042
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave Techniques Investigations of ZnCoO Films Grown by Atomic Layer Deposition
    Autorzy:
    Łukasiewicz, M.
    Cabaj, A.
    Godlewski, M.
    Guziewicz, E.
    Wittlin, A.
    Jaworski, M.
    Wołoś, A.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492931.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Electrical and magnetic properties of ZnCoO thin films grown on silicon substrates by atomic layer deposition method are investigated. The films were grown using reactive organic precursors of zinc and cobalt. The use of these precursors allowed us the significant reduction of a growth temperature to 200°C and below, which proved to be very important for the growth of uniform films of ZnCoO. We have measured the microwave AC conductivity and EPR for two types of ZnCoO samples, with different Co fractions.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 911-913
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    (Zn,Cu)O Films by Atomic Layer Deposition - Structural, Optical and Electric Properties
    Autorzy:
    Łukasiewicz, M.
    Witkowski, B.
    Wachnicki, Ł.
    Kopalko, K.
    Gierałtowska, S.
    Wittlin, A.
    Jaworski, M.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492571.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    ZnCuO thin films have been deposited on silicon, glass and quartz substrates by atomic layer deposition method, using reactive organic precursors of zinc and copper. As zinc and copper precursors we applied diethylzinc and copper(II) acetyloacetonate. Structural, electrical and optical properties of the obtained ZnCuO layers are discussed based on the results of scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, the Hall effect and photoluminescence investigations.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-034-A-036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cathodoluminescence Profiling for Checking Uniformity of ZnO and ZnCoO Thin Films
    Autorzy:
    Witkowski, B. S.
    Łukasiewicz, M. I.
    Wolska, E. A.
    Kopalko, K.
    Kowalski, B. J.
    Guziewicz, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048105.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    78.30.Fs
    78.60.Hk
    Opis:
    We employ scanning electron microscopy and cathodoluminescence for evaluation of uniformity of ZnCoO films obtained by the atomic layer deposition. Cathodoluminescence quenching by Co ions allows us to detect (regions of weaker light emission) Co accumulations, with the resolution limited by diffusion length of secondary carriers.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 675-677
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZnCoO Films by Atomic Layer Deposition - Influence of a Growth Temperature οn Uniformity of Cobalt Distribution
    Autorzy:
    Łukasiewicz, M.
    Witkowski, B.
    Godlewski, M.
    Guziewicz, E.
    Sawicki, M.
    Paszkowicz, W.
    Łusakowska, E.
    Jakieła, R.
    Krajewski, T.
    Kowalik, I.
    Kowalski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791350.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    We report on the structural, electrical and magnetic properties of ZnCoO thin films grown by atomic layer deposition method using reactive organic precursors of zinc and cobalt. As a zinc precursor we applied either dimethylzinc or diethylzinc and cobalt(II) acetyloacetonate as a cobalt precursor. The use of these precursors allowed us the significant reduction of a growth temperature to 300°C and below, which proved to be very important for the growth of uniform films of ZnCoO. Structural, electrical and magnetic properties of the obtained ZnCoO layers will be discussed based on the results of secondary ion mass spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, Hall effect and SQUID investigations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 921-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ZnCoO Films Obtained at Low Temperature by Atomic Layer Deposition Using Organic Zinc and Cobalt Precursors
    Autorzy:
    Łukasiewicz, M.
    Wójcik-Głodowska, A.
    Guziewicz, E.
    Jakieła, R.
    Krajewski, T.
    Łusakowska, E.
    Paszkowicz, W.
    Minikayev, R.
    Kiecana, M.
    Sawicki, M.
    Godlewski, M.
    Wachnicki, Ł.
    Szczepanik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811957.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    In this paper we report on ZnCoO thin films grown by atomic layer deposition method in reactor F-120 Satellite. ZnCoO films were grown at low temperature ($T_s$=160°C) with a new zinc precursor (dimethylzinc - DMZn) and with cobalt (II) acetyloacetonate (Co(acac)₂) as a cobalt precursor and deionized water as an oxygen precursor. In this paper we concentrate on the methods of homogenizing Co distribution in ZnCoO films.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1235-1240
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in Luminescence of Ce:yag Crystals Under Ionizing Radiation Treatment
    Autorzy:
    Kaczmarek, S. M.
    Moroz, Z.
    Kwasny, M.
    Kisielewski, J.
    Lukasiewicz, T.
    Wojtkowska, J.
    Rzewuski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008301.pdf
    Data publikacji:
    1999-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ji
    61.80.Ed
    Opis:
    Radiation induced changes in the luminescence spectrum under influence of UV light, γ-rays, electrons and protons for several concentrations of Ce$\text{}^{3+}$ ions as well as Mg$\text{}^{2+}$ ions in yttrium-aluminum garnet crystals were investigated. To irradiate with γ and electron as grown crystals were used while for proton irradiations the crystals were thermally annealed. For small concentrations of cerium ions (≈0.01 at.%) an increase in the luminescence (about 100%) was observed after gamma irradiation with a dose of 10$\text{}^{5}$ Gy. This increase was due to the growth in Ce$\text{}^{3+}$ ions concentration after γ-irradiation (≈50%), due to the Ce$\text{}^{4+}$ → Ce$\text{}^{3+}$ recharging reaction. For highly doped Ce:YAG crystals (0.1 at%, 0.2 at.%) also an increase, but much smaller (4%), for the Mg codoped crystals (0.1 at.%) was observed. After 1 MeV electron irradiation in the over-threshold type interaction a decrease in luminescence is observed due to the domination of the Ce$\text{}^{3+}$ → Ce$\text{}^{4+}$ ionization process. In the case of the proton irradiation, for small fluencies (≈10$\text{}^{13}$ particles/cm$\text{}^{2}$) an increase in luminescence is observed due to the domination of the recharging processes of Ce$\text{}^{4+}$ ions. For larger fluencies (>10$\text{}^{14}$ particles/cm$\text{}^{2}$) a decrease takes place due to a high level of radiation defects.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 6; 953-964
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Structure Formed at Different Stages οf Growth Process in Erbium, Calcium and Holmium Doped $YVO_{4}$ Crystals
    Autorzy:
    Malinowska, A.
    Wierzbicka, E.
    Lefeld-Sosnowska, M.
    Wieteska, K.
    Wierzchowski, W.
    Łukasiewicz, T.
    Świrkowicz, M.
    Graeff, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538950.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    Opis:
    The defect structure of $YVO_{4}$ single crystals doped with $Er^{3+},$ $Ho^{3+}$ and $Ca^{2+}$ were studied by X-ray diffraction topographic methods, using laboratory and synchrotron radiation sources. Variously developed block structure was the dominating imperfection of the investigated crystals observed both in conventional Lang and synchrotron topographs. The evaluation of block misorientation was realised by means of superimposed projection and section white beam synchrotron radiation topographs. More possibilities of following the mutual rotation of blocks were provided by means of white beam synchrotron radiation WBSR projection topographs exposed through the fine mesh.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 328-331
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterisation of the Defect Structure in Gadolinum Orthovanadate Single Crystals Grown by the Czochralski Method
    Autorzy:
    Wierzbicka, E.
    Malinowska, A.
    Wieteska, K.
    Wierzchowski, W.
    Lefeld-Sosnowska, M.
    Świrkowicz, M.
    Łukasiewicz, T.
    Paulmann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431600.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    Opis:
    The $GdVO_4$ single crystals, both undoped and doped with erbium or thulium, were studied by means of X-ray diffraction topographic methods exploring laboratory and synchrotron radiation sources. Variously developed block structure, caused probably by thermal stresses, was revealed. The highest crystallographic perfection was observed in the crystal doped with 4 at.% of thulium, which was free of the grain boundaries in the end part. Contrary to that, the differences in structural perfection between samples cut out from various regions of the crystal and for different kinds of doping, were less distinct in other crystals. The diffraction topographic methods enabled the statement that the misorientation between various blocks is in the range of several arc minutes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 906-909
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Topographic Studies of Defect Structure in $YVO_4$ Crystals
    Autorzy:
    Wieteska, K.
    Wierzchowski, W.
    Łukasiewicz, T.
    Wierzbicka, E.
    Malinowska, A.
    Lefeld-Sosnowska, M.
    Graeff, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812259.pdf
    Data publikacji:
    2008-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    Opis:
    The perfection of $YVO_4$ crystals, which are predicted to replace formerly used YAG garnets due to higher quantum efficiency and lower excitation level, was studied. The investigations of Czochralski grown undoped $YVO_4$ single crystals were performed mainly by means of X-ray topographic methods. Both synchrotron and conventional X-ray sources were used. The study revealed relatively high density of weak point-like contrasts which can be most probably interpreted as dislocation outcrops. In regions of the crystal close to its boundary we observed glide bands. It was also found that in some regions the dislocations form local subgrain boundaries. The white beam back reflection and monochromatic beam topography allowed to evaluate a local misorientation which not exceeded several angular minutes. No segregation fringes were observed proving a good homogeneity of chemical composition.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 2; 455-461
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synchrotron Diffraction topography in Studying of the Defect Structure in Crystals Grown by the Czochralski Method
    Autorzy:
    Wierzchowski, W.
    Wieteska, K.
    Malinowska, A.
    Wierzbicka, E.
    Lefeld-Sosnowska, M.
    Świrkowicz, M.
    Łukasiewicz, T.
    Pajączkowska, A.
    Paulmann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399483.pdf
    Data publikacji:
    2013-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    Opis:
    The synchrotron diffraction topography had been widely used for investigation of the structural defects in crystals grown by the Czochralski method. Similarly as conventional diffraction topography, the synchrotron topography consists in recording with high spatial resolution of the beam formed by the Bragg reflection from the crystal. The advantages of synchrotron sources come from the possibilities of using the wavelength from a wide spectral range, improved high spatial resolution and collimation of the beam as well as from shortening the time necessary for the investigation. The synchrotron diffraction topography includes experimentally simpler white beam topography and more complicated monochromatic beam (multicrystal) topography, where the beam is formed by monochromators. In the case of Czochralski-grown crystals the synchrotron diffraction topography can be used for studying of the individual dislocations and their complexes such as glide bands or sub-grain boundaries, individual blocks, twinning, the domain structure and various segregation effects negatively affecting crystal properties. In addition, the topographical investigation can provide information concerning the reasons for the generation of defects, useful in the improving of the technology. In the present paper the possibilities of the synchrotron diffraction topography are discussed on the basis of several investigations of the Czochralski-grown oxide and semiconductor crystals, performed by the authors at HASYLAB. The majority of the results concern the oxide crystals grown at the Institute of Electronic Materials Technology, in particular garnets, orthovanadates, mixed calcium barium and strontium niobates as well as praseodymium lanthanum aluminates.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 2; 350-359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-ray Topographic Investigations of Domain Structure in Czochralski Grown $Pr_{x}La_{1-x}AlO_{3}$ Crystals
    Autorzy:
    Wieteska, K.
    Wierzchowski, W.
    Malinowska, A.
    Turczyński, S.
    Lefeld-Sosnowska, M.
    Pawlak, D.
    Łukasiewicz, T.
    Graeff, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538809.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.10.Dn
    61.72.Ff
    Opis:
    In the present paper X-ray diffraction topographic techniques were applied to a number of samples cut from Czochralski grown $Pr_{x}La_{1-x}AlO_{3}$ crystals with different ratio of praseodymium and lanthanum. Conventional and synchrotron X-ray topographic investigations revealed differently developed domain structures dependent on the composition of mixed praseodymium lanthanum aluminium perovskites. Some large mosaic blocks were observed together with the domains. In the best crystals, X-ray topographs revealed striation fringes and individual dislocations inside large domains. Synchrotron topographs allowed us to indicate that the domains correspond to three different crystallographic planes, and to evaluate the lattice misorientation between domains in the range of 20-50 arc min.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 268-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synchrotron Topographic Studies of Domain Structure in Czochralski Grown $Pr_xLa_{1-x}AlO_3$ and $Pr_xLa_{1-x-y}Mg_yAlO_3$ Crystals
    Autorzy:
    Wieteska, K.
    Wierzchowski, W.
    Malinowska, A.
    Turczyński, S.
    Lefeld-Sosnowska, M.
    Pawlak, D.
    Łukasiewicz, T.
    Paulmann, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431651.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.10.Dn
    61.72.Ff
    Opis:
    A domain structure and crystallographic defects in Czochralski grown single crystals of $Pr_xLa_{1-x}AlO_3$ and $Pr_xLa_{1-x-y}Mg_yAlO_3$ were characterised with a number of methods including conventional and synchrotron X-ray diffraction topography, and polariscopic micrography. The observed twin domain systems were located perpendicularly to 〈100〉$\text{}_\text{pcub}$ and 〈110〉$\text{}_\text{pcub} (pseudocubic) directions. It has been confirmed that the domains are of the same orientation and a twin character as those described in literature for $LaAlO_3$ and $LaGaO_3$ crystals. The use of section transmission topography enabled to indicate that the domains are perpendicular to the $(100)_\text{pcub}$ surface of the samples. The misorientation of lattice in the domains was evaluated from the white beam topographs and a tendency of its increase with increasing concentration of praseodymium was revealed.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 910-914
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic and Laser Properties of LiNbO$\text{}_{3}$:Dy$\text{}^{3+}$ Crystals
    Autorzy:
    Malinowski, M.
    Myziak, P.
    Piramidowicz, R.
    Pracka, I.
    Łukasiewicz, T.
    Surma, B.
    Kaczmarek, S.
    Kopczyński, K.
    Mierczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945542.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Ht
    78.40.Ha
    78.47.+p
    78.55.Hx
    Opis:
    The spectroscopic properties of trivalent dysprosium (Dy$\text{}^{3+}$) doped LiNbO$\text{}_{3}$ crystals have been investigated at various temperatures. Absorption, emission, excitation and lifetime measurements have been performed and discussed in the framework of Judd-Ofelt approach. The stimulated emission cross sections of the strongest transitions of Dy $\text{}^{3+}$ ion have been estimated. A stimulated emission has been demonstrated in the near infrared.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 181-189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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