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    Wyświetlanie 1-48 z 48
    Tytuł:
    Resonant Phonons in Adsorbed Slabs
    Autorzy:
    Dobrzynski, L.
    Akjouj, A.
    Syla, B.
    Djafari-Rouhani, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892256.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    Opis:
    Resonant phonons, sometimes also called leaky waves, are phonons associated with a crystal defect, a surface, an adsorbed layer and whose frequencies fall inside the bulk crystal band. Such resonant phonons were studied experimentally and theoretically before for clean surfaces and for adsorbed monolayers. We present here a study of resonant phonons associated with the adsorption of a slab of L monolayers on a substrate. With the help of a simple atomic model, we obtained a closed form expression giving the variation of the transverse phonon density of states associated with the adsorption of the slab. An application which qualitatively simulates the adsorption of L monolayers of Ge on Si shows the existence of well-defined resonant phonons within the bulk acoustic band of the substrate.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 85-90
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time and Frequency Resolved THz Spectroscopy of Micro- and Nano-Systems
    Autorzy:
    Kröll, J.
    Darmo, J.
    Unterrainer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041637.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    Opis:
    Terahertz time-domain spectroscopy is applied to characterize ultra-thin metallic layers and nanoscale composite material - single-wall carbon nanotube mat.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 92-98
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced Exciton-Phonon Interaction in Strained ZnCdSe/ZnSe Quantum Well Structures
    Autorzy:
    Godlewski, M.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968093.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    76.70.Hb
    Opis:
    Radiative recombination processes in pseudomorphic ZnCdSe/ZnSe structures are compared to those observed in strain-relaxed structures grown on GaAs substrates with thick ZnSe buffer layers. From the temperature dependence of the photoluminescence line width we evaluate the strength of exciton-phonon interaction with acoustic (dominant at lower temperatures) and optical phonons. Stronger exciton-phonon interaction is observed for pseudomorphic structures. Such enhanced exciton-phonon interaction is likely responsible for a faster photoluminescence deactivation at increased temperatures. We also report different exciton properties (photoluminescence intensity, width, strength of exciton-phonon interaction) in quantum well of a given width but in structures grown with different order of quantum wells. More stable photoluminescence (with increasing temperature) is observed for a given quantum well if it is closer to the buffer layer and not to the cap layer.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 769-773
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonradiative Recombination Processes in (CdTe,CdCrTe)/CdMgTe Quantum Well Structures
    Autorzy:
    Godlewski, M.
    Ivanov, V.
    Zakrzewski, A. J.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968108.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    76.70.Hb
    Opis:
    Photoluminescence transitions in (CdTe,CdCrTe)/CdMgTe structure grown by molecular beam epitaxy are studied. Photoluminescence investigations show a very strong reduction of the photoluminescence intensity from chromium doped quantum wells. We explain this fact by a very efficient nonradiative recombination in the chromium-doped quantum wells. The present results indicate that the Auger-type energy transfer from excitons to chromium ions is responsible for the photoluminescence deactivation. The efficiency of this process is evaluated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 781-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of d.c.-Plated Nanocrystalline Nickel Deposits
    Autorzy:
    Szeptycka, B.
    Derewnicka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035480.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    68.37.Lp
    68.60.-p
    Opis:
    The microstructure, microhardness, corrosion, and wear resistance of d.c.-plated Ni electrodeposits prepared from different types of electrolyzing Watts-type baths, without or with organic compounds, ceramic powder - SiC and polymer - polytetrafluoroethylene (PTFE), on Cu substrate, which was subsequently removed from the deposits, were investigated. With the change of the type of bath, the deposit grain size was found to decrease markedly, e.g. deposits with an average grain size of about 50 nm could be produced from a bath containing 45 g/dm$\text{}^{3}$ Ni$\text{}^{2}$+ ions, 5 g/dm$\text{}^{3}$ SiC, and 20 g/dm$\text{}^{3}$ PTFE. The surface morphology on the bath side of the electrodeposited Ni or Ni-SiC-PTFE foils was characteristic of the type of bath, and its roughness correlated well with the observed grain size. Microhardness and wear resistance increased with decreasing grain size, as expected. On discussing the factors controlling deposit grain size, it is concluded that the Ni$\text{}^{2+}$ ion content in the bath and the presence of organic compounds may have a decisive role.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 199-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Electrical Characterization of (002)-Preferentially Oriented n-ZnO/p-Si Heterostructure
    Autorzy:
    Abdallah, B.
    Al-Khawaja, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401869.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.15.gm
    66.70.Df
    68.60.-p
    Opis:
    In this paper, preferentially oriented (002) ZnO thin films have been grown on Si (100) and glass substrates using radio frequency magnetron sputtering. The dependence of the quality of the ZnO thin films at different substrate temperatures on the growth is studied. A ZnO thin film with c-axis-oriented würtzite structure is obtained at a growth temperature from 200 to 400°C. X-ray diffraction shows that the full width at half maximum θ -2θ of (002) ZnO/Si is located at approximately 34.42°, which is used to infer the grain size that is found to be 17 nm to 19.7 nm. The FWHM is 9.5° to 8° in rocking curve mode, from which the crystalline quality has been determined. The texture degree demonstrates the improvement in quality with the increase of substrate temperature, which is best at 400°C. The band gap extracted by UV transmittance spectrum has been identified as 3.2 eV at 400°C. The electrical characteristics via C-V and I-V measurements on the basis of the heterojunction thermal emission model confirm the domination of high-density grain boundary layer existing at the interface. The transport currents indicate to the presence of space-charge-limited current and trap-charge-limited current mechanisms.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 283-288
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Characterization of CdZnSe/ZnSe Multiquantum Well System
    Autorzy:
    Godlewski, M.
    Karpińska, K.
    Bergman, J. P.
    Monemar, B.
    Kurtz, E.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932081.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    71.35.+z
    76.70.Hb
    Opis:
    Optical properties of Cd$\text{}_{x}$Zn$\text{}_{1-x}$Se/ZnSe (x = 0.12) multiquantum well system are discussed. The transient photoluminescence and optically detected cyclotron resonance experiments demonstrate a strong contribution of bound exciton emission to the low temperature photoluminescence spectra.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 209-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Growth Conditions on Optical Properties of ZnCdSe/ZnSe Quantum Wells Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Bergman, J. P.
    Monemar, B.
    Kurtz, E.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950749.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    71.35.+z
    76.70.Hb
    Opis:
    The results of investigations of photoluminescence, time-resolved photoluminescence, photoluminescence kinetics and their temperature dependencies are discussed for two types of ZnCdSe/ZnSe multi quantum well structures - for pseudomorphic and for strain relaxed structure. Densities of 2D localized states and averaged localization energies, as seen by excitons, are determined from the photoluminescence kinetics measurements. We show distinct differences between exciton properties in two multi quantum well structures studied.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 785-788
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure, Surface Morphology and Optical Properties of Thin Films of ZnS and CdS Grown by Atomic Layer Epitaxy
    Autorzy:
    Szczerbakow, A.
    Godlewski, M.
    Dynowska, E.
    Ivanov, V. Yu.
    Świątek, K.
    Goldys, E. M.
    Phillips, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992336.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.60.-p
    81.15.Gh
    Opis:
    In this communication we report successful growth of monocrystalline cubic ZnS and monocrystalline and polycrystalline cubic and wurtzite films of CdS by atomic layer epitaxy. Structural and optical properties of these films are analysed. ZnS (and CdS/ZnS) films grown on GaAs substrate are cubic. Atomic layer epitaxy grown films provide several advantages over ZnS and CdS materials grown by other techniques, especially compared to bulk material, which is grown at higher temperatures. First results for ZnS/CdS/ZnS quantum well structures are also discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Expansion of Free-Volume in Hexadecane Confined in the Silica Gel Nanopores
    Autorzy:
    Šauša, O.
    Majerník, V.
    Illeková, E.
    Macová, E.
    Berek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196177.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    78.67.Rb
    78.70.Bj
    Opis:
    Temperature dependence of the free-volume of voids in hexadecane (HXD) confined in the 3 nm silica gel pores (Develosil-30) was measured by positron annihilation lifetime spectroscopy. Different amount of HXD was filled into the pores of matrix. The anomalous thermal expansion was observed in the partially filled pores with extremely low filling. The thermal expansion coefficient of free-volume voids in this solidified HXD layer has a negative sign at temperatures below 180 K compared to high- or full-filled pores of silica gel. At these temperatures, the positron annihilation lifetime spectroscopy measurements demonstrate the appearance of a new type of the free volume within HXD which has been interpreted as the cracks in the HXD layer on the inner walls of matrix cavities. The differential scanning calorimetry method confirmed that the processes were enacted within pores and not on the outer surfaces of silica gel grains. In the sample with the extremely low filling, only the one HXD solidification/melting effect connected with confined states is manifested.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 798-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon Doped Austenitic Stainless Steel Coatings Obtained by Reactive Magnetron Sputtering
    Autorzy:
    Fryska, S.
    Giza, P.
    Jedrzejewski, R.
    Baranowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402218.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    68.60.Bs
    68.55.J-
    81.15.-z
    Opis:
    The paper presents the results of investigations of carbon doped austenitic stainless steel coatings (carbon S-phase) obtained by the reactive magnetron sputtering in the reactive atmosphere composed of argon and methane as a carbon source. Stainless steel targets were sputtered under different conditions. During the experiments the argon to methane proportion varied within a range 11/2-7/6. The other parameters such as temperature, pressure, sputtering power, etc. were kept constant. The phase composition was determined using the X-ray diffraction. Electron probe microanalysis (energy dispersive spectroscopy and wavelength dispersive spectroscopy) and glow discharge optical emission spectrometry techniques were used to study element composition of the coatings. Microstructure was investigated by scanning electron microscopy. It was found that varying the methane volume in the reactive atmosphere, it is possible to control the lattice parameter of the carbon S-phase.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 879-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Pressure Influence on the Properties of S-Phase Coatings Deposited by Reactive Magnetron Sputtering
    Autorzy:
    Fryska, S.
    Baranowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400448.pdf
    Data publikacji:
    2013-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.-z
    68.60.-p
    68.60.Bs
    68.55.J-
    Opis:
    Reactive magnetron sputtering of austenitic stainless steel in nitrogen containing atmosphere was used to deposit coatings composed of S-phase. The process was conducted at constant temperature (200°C). The influence of total and partial nitrogen pressure on coating characteristics was investigated. It was observed that both total and nitrogen partial pressures have influence on coating composition and microstructure. Increasing nitrogen content in the S-phase coating can have a beneficial effect on its corrosion characteristics. It was also found that coatings deposited in the ambient of high nitrogen contents are composed of S-phase and the additional high-nitrogen phase, which is of crucial influence on mechanical properties of the coatings. It was also found that partial argon pressure can contribute to the changes in mechanical properties of the coatings.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 5; 854-857
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Garnet Single Crystal as Substrate Material for HTSC Films
    Autorzy:
    Mukhopadhyay, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964306.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    68.60.-p
    74.76.Bz
    81.15.-z
    Opis:
    The use of high temperature superconductor for device application has made the compatibility of the film and substrate an important issue. Garnets having reasonably low dielectric constant and low dielectric losses can be viable low cost substrate materials for the microwave devices. Garnet single crystals like Gd$\text{}_{3}$Ga$\text{}_{5}$O$\text{}_{12}$ (GGG), Y$\text{}_{3}$Ga$\text{}_{5}$O$\text{}_{12}$ (YGG), Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG) etc. can be potential HTSC substrate materials for microwave devices. Properties of HTSC films on some of these garnet crystals are compared here.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 147-151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barrier Properties of Coated and Laminated Polyolefin Films for Food Packaging
    Autorzy:
    Lazić, V.
    Budinski-Simendić, J.
    Gvozdenović, J.
    Simendić, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538171.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.35.Lr
    66.30.Pa
    82.80.Bg
    68.60.-p
    Opis:
    The food packaging industry demands polymer films possessing a defined barrier against permeation of gases, moisture and flavor. The objective of this study was to assess the differences between the barrier properties of coated and un-coated polyolefine films. Eight types of packaging films are prepared by standard industrial procedure by cast film extrusion processing with chill rollers: biaxially oriented polypropylene (BOPP), BOPP coated by acrylic copolymer, metallized BOPP by aluminum, and low-density polyethylene (LDPE). The influence of lamination and metallization on the gas molecules ($CO_{2}$, $O_{2}$ and $N_{2}$) was determined by Lyssy's method. The moisture transparency was assessed according to the gravimetric method. The substantial differences between the barrier properties of the coated and un-coated films were estimated. It was estimated that the lamination process improves the oxygen barrier but not necessarily the moisture barrier, due to the different mechanisms for oxygen and moisture permeability. The obtained barrier properties data were considered from a practical point of view. It was concluded that films based on metallized BOPP has excellent barrier properties and can be used to over wrap food products.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 855-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Dynamics in CdTe/CdMnTe Multiquantum Well Structures Grown by Molecular Beam. Epitaxy on GaAs Substrate
    Autorzy:
    Godlewski, M.
    Koziarska, B.
    Suchocki, A.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Bergman, J.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934057.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    78.47.+p
    73.20.Fz
    71.35.+z
    Opis:
    The results of picosecond photoluminescence kinetics of four different CdTe/CdMnTe multiquantum well structures grown by MBE on GaAs substrates are presented. The experimental results show that excitons in CdTe quantum wells are strongly localized by potential fluctuations. Photoluminescence decay times of the localized excitons are considerably shorter (about 120 ps) than those reported for free or quasi-free excitons. An influence of Mn in the barriers on exciton properties is demonstrated. For narrow quantum wells as well as for the multiquantum well structure with the highest Mn mole fraction the excitons migrate during their decay to the states with a lower potential energy. Longer decay times are observed for quasi-localized excitons. We show also that for strongly localized excitons the energy transfer between localized and donor bound excitons is less efficient.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 985-989
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Thermal Annealing Effect on the Properties of Silver Thin Films Prepared by DC Magnetron Sputtering
    Autorzy:
    Hajakbari, F.
    Ensandoust, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186936.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.cd
    81.40.-z
    68.55.-a
    68.60.-p
    Opis:
    Silver nanoparticles have potential applications in fields of nanosicence and technology. In this work, polycrystalline silver (Ag) thin films were deposited on quartz substrates by DC magnetron sputtering method at the same deposition conditions and then, the Ag films were annealed in oxygen atmosphere for 65 min at different annealing temperatures namely 300, 400, 500 and 600°C. The crystal structure of the films was evaluated by X-ray diffraction. The atomic force microscopy and scanning electron microscopy were employed for surface morphological studies of the films. Normal-incidence transmittance over the wavelength range of 200-2500 nm was measured using a spectrophotometer. The results show that the crystallization of the films increases after annealing and that the Ag films without annealing have lowest roughness. Annealing temperature effectively influences the surface morphology of the films. Optical studies reveal that the as-deposited Ag film has metallic behavior with zero transmittance and after annealing, the transmittance increases due to the formation of silver oxide phases in the films.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 680-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Ti, V and Their Oxides-Based Thin Films in the Search for Hydrogen Storage Materials
    Autorzy:
    Tarnawski, Z.
    Zakrzewska, K.
    Kim-Ngan, N.-T.
    Krupska, M.
    Sowa, S.
    Drogowska, K.
    Havela, L.
    Balogh, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401913.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    68.49.-h
    61.05.C-
    68.60.-p
    Opis:
    Thin film series consisting of Ti, V, TiO₂ and V₂O₅ layer with different layer geometries, sequences and thicknesses have been prepared by the sputtering technique. The hydrogen depth profile of selected films upon hydrogen charging at 1 bar and/or hydrogenation at pressure up to 102 bar was determined by using secondary ion mass spectrometry and nuclear reaction analysis using a N-15 beam. The highest hydrogen storage with a concentration up to 50 at.% was found in the pure Ti and Ti-contained layer, while it amounts to around 30% in the metallic Ti-V-Ni layer. Hydrogen can diffuse through the TiO₂ layer without accumulation, but can be stored in the VO₂ layer in some cases. Hydrogen can remove the preferential Ti orientation in the films and induce a complete transition of V₂O₅ into VO₂ in the films.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 431-439
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Transparent and Nanocrystalline $TiO_{2}:Nd$ Thin Films Prepared by Magnetron Sputtering
    Autorzy:
    Domaradzki, J.
    Wojcieszak, D.
    Prociow, E.
    Kaczmarek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807648.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.82.Rx
    68.55.-a
    68.60.-p
    68.60.Dv
    78.20.-e
    Opis:
    In this work structural and optical properties of $TiO_{2}$ thin films doped with different amount of Nd have been outlined. The result have shown that by quantity of Nd amount in the film dense nanocrystalline or amorphous thin films were obtained.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-75-S-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Contribution in Thermodynamics οf Nano-Crystalline Films and Wires
    Autorzy:
    Šetrajčić, J.
    Mirjanić, D.
    Vučenović, S.
    Ilić, D.
    Markoski, B.
    Jaćimovski, S.
    Sajfert, V.
    Zorić, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808050.pdf
    Data publikacji:
    2009-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.-e
    65.40.Ba
    67.25.dp
    68.60.-p
    68.65.La
    Opis:
    Spectra of possible phonon states, as well as thermodynamic characteristics of nanocrystals (ultrathin film and quantum wire) of simple cubic crystalline structure are analyzed in this paper, using the method of two-time dependent Green functions. From energy spectra and internal energy of the system the thermal capacitance of these structures in low temperature region is found. The temperature behavior of specific heat is compared to that of corresponding bulk structure. It is shown that at extremely low temperatures thermal capacitance of quantum wire is considerably lower than the thermal capacitance of film as well as the bulk sample. Consequences of this fact are discussed in detail and its influence to thermodynamic properties of materials is estimated.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 4; 778-782
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Five-Layered ZrO₂ and Single-Layered Ce, Eu, and Dy-Doped ZrO₂ Thin Films Prepared by Sol-Gel Spin Coating Method
    Autorzy:
    Çiçek Bezir, N.
    Evcin, A.
    Kayali, R.
    Özen, M.
    Esen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031178.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.-d
    68.55-a
    68.60-p
    78.20.-e
    81.10.Dn
    71.20.Be
    Opis:
    In order to investigate the influence of the number of layers on the properties of ZrO₂ thin films, we prepared one pure ZrO₂ film sample with five layers and Ce, Eu, and Dy-doped ZrO₂ samples with single layer, by spin-coating sol gel-method. The crystal structures of thin films were determined using X-ray diffraction, morphology of the samples was analyzed by scanning electron microscopy, and the optical properties of the samples were determined by ultraviolet/visible absorbance measurements. The results of these measurements have shown that the concentration of the dopants and the thickness of thin film layers play a vital role in the physical, chemical, and optical properties of the pure and doped ZrO₂ thin films.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 612-616
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Pure and Doped TiO₂ Thin Films Prepared by Sol-Gel Spin-Coating Method
    Autorzy:
    Çiçek Bezir, N.
    Evcin, A.
    Kayali, R.
    Özen, M.
    Balyaci, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031525.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.-d
    68.55.-a
    68.60.-p
    78.20.-e
    81.10.Dn
    71.20.Be
    Opis:
    In this study, using spin-coating sol-gel method we fabricated TiO₂ thin films, doped with different concentrations (1, 2, and 3 mole %) of Ce, Dy, and Eu. Characterization of the prepared samples was performed by means of the X-ray diffraction, scanning electron microscopy, ultraviolet visible absorption, and differential thermal and thermo gravimetric analysis. X-ray diffraction measurements have shown that in Eu and Dy-doped samples crystal structure consists of mixed rutile and the dominant anatase phases, however the Ce doped samples consist of anatase phase only. Scanning electron microscopy images have revealed that while average thin film thickness of the Dy-doped samples decreases with increasing concentration of Dy, the average film thicknesses of samples doped with Ce and Eu increases with increasing concentrations of these dopants. Ultraviolet visible absorption spectroscopy measurements have shown that while absorbances of the samples doped by 1 and 2 mole % of the dopants have nearly similar properties, these properties differ from each other for 3 mole % of the dopants. Finally, differential thermal and thermo gravimetric analyses have shown that the chemical reactions and weight losses of the samples have occurred at the expected temperatures.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 620-624
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Desorption of Au from W(001) Surface
    Autorzy:
    Błaszczyszyn, R.
    Chrzanowski, J.
    Godowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035647.pdf
    Data publikacji:
    2002-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Vx
    68.55.Ac
    68.60.Dv
    Opis:
    Adsorption of Au on W(001) at 450 K up to multilayer structures was investigated. Temperature programmed desorption technique was used in determination of coverage dependent desorption energy (region up to one monolayer). Results were discussed in terms of competitive interactions of Au-Au and Au-W atoms. Simple procedure for prediction of faceting behavior on the interface, basing on the desorption data, was postulated. It was deduced that the Au/W(001) interface should not show faceting tendency after thermal treatment.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 6; 785-794
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Segregation of CoPt Polycrystalline Alloy
    Autorzy:
    Godowski, P. J.
    Ohgi, T.
    Fujita, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036875.pdf
    Data publikacji:
    2003-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Dv
    68.47.De
    79.60.-i
    Opis:
    Composition-depth profiling using different emission angles of X-ray photoelectron spectroscopy showed surface enhancement of platinum concentration of the CoPt(30at%) alloy extensively annealed to 1000~K in ultrahigh vacuum. The results are compared with theoretical predictions basing on models with no crystal face dependence.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 1; 35-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porosity of Low-κ Materials Studied by Slow Positron Beam
    Autorzy:
    Brusa, R. S.
    Macchi, C.
    Mariazzi, S.
    Karwasz, G. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042213.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    78.70.Bj
    68.60.Dv
    68.90.+g
    Opis:
    The information about porosity in low-κ materials obtainable by depth profiling with positron annihilation spectroscopy is reviewed. In particular we focus on Doppler broadening spectroscopy and 2-3γ ratio of positronium measurements on SiOCH and amorphous carbon a-C:F:H thin films produced by plasma enhanced chemical vapour deposition.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 702-711
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Temperature-Dependent Surface Structure of Metals
    Autorzy:
    Bonzel, H. P.
    Breuer, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892524.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Rh
    68.35.Md
    79.60.Cn
    82.65.Dp
    Opis:
    Recent experimental results based on X-ray photoelectron diffraction from a Pb(110) crystal are discussed in terms of surface roughening and surface melting. In comparison to other reports on Pb(110) surface roughening it is recognized that the correct determination of the roughening transition on (110) surfaces of fcc metals may be intrinsically difficult because of anisotropy. A novel technique for investigating the temperature-dependent surface free energy is described. The method involves the quasi-steady-state shape of periodic surface profiles on Au(111) and Au(100) single crystals. First results are reported for two crystallographic zones (111)⟨112⟩ and (100)⟨110⟩ of Au. These results illustrate the strong anisotropy of Δγ/γ of ~23% and ~ 4% at T = 0 K for the (111)⟨112⟩ and (100)⟨110⟩ zones, respectively. The data suggest that the low-index surfaces of Au(111) and (100) are not likely to roughen at T ≤ T_{M}.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 265-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Stability of Two Rhombohedral Phases of Si$\text{}_{0.5}$Ge$\text{}_{0.5}$ Alloy
    Autorzy:
    Bogusławski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890689.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.55.Hg
    68.35.Md
    68.60.Dv
    Opis:
    Thermodynamic stability of two ordered phases, RS1 and RS2, of Si$\text{}_{0.5}$Ge$\text{}_{0.5}$ alloy is considered. Bulk and surface formation enthalpies are calculated using the model Tersoff's potential. RS2 structure is unstable, but its (001) ordered surface is stable against segregation. Properties of RS1 are just the opposite.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 299-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of the Periodically Inhomogeneous Surface: Multiple Boundary Condition
    Autorzy:
    Puszkarski, H.
    Krawczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014016.pdf
    Data publikacji:
    2000-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.-p
    02.60.Lj
    Opis:
    We deal with the following question: how can the composite nature of a boundary condition formulated for a periodically inhomogeneous surface and involving the composite surface parameter, be treated analytically? We show that when the appropriate Fourier transformation is applied, the composite boundary condition reduces to a specific eigenproblem condition, which constitutes the spectrum of eigenvalues of an "effective" surface parameter, a novel quantity we introduced to account for the nonhomogeneity of the surface.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 6; 1017-1022
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Stability of Ordered Ga$\text{}_{0.5}$In$\text{}_{0.5}$P and GaAs$\text{}_{0.5}$Sb$\text{}_{0.5}$ Alloys
    Autorzy:
    Bogusławski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877570.pdf
    Data publikacji:
    1991-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.55.Hg
    68.65.+g
    68.60.Dv
    Opis:
    Formation enthalpies of (001) surfaces terminating ordered Ga$\text{}_{0.5}$In$\text{}_{0.5}$P and GaAs$\text{}_{0.5}$Sb$\text{}_{0.5}$ alloys were calculated using the VFF model. For several ordered phases, chemically ordered surfaces were found to be stable against surface segregation. In particular, even phases unstable against bulk segregation may be terminated by a stable surface.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 1; 125-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Properties of Co and CoFe Electrodes Forming a Magnetic Tunnel Junction
    Autorzy:
    Gładczuk, L.
    Pankowski, P.
    Paszkowicz, W.
    Dłużewski, P.
    Wójcik, M.
    Przysłupski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047237.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Hi
    68.65.Ac
    61.10.Nz
    76.60.Lz
    68.37.Lp
    Opis:
    The M$\text{}_{1}$/MgO/M$\text{}_{2}$ trilayer tunnel magnetoresistance systems are studied by means of X-ray diffraction, NMR, and transmission electron microscopy techniques. As M$\text{}_{1}$ and M$\text{}_{2}$ electrodes we used Co, Fe, and CoFe layers. The growth mechanism and structural quality of both electrodes and of the epitaxial MgO barrier forming the magnetic tunnel junctions are experimentally examined. It is shown that the crystallographic coherence of magnetic tunnel junctions across the MgO barrier is significantly disturbed by imperfect crystal structure of magnetic electrodes. The NMR results indicate a difference in short-range order between bottom and top electrodes.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 135-140
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption Properties of the Cu(115) Surface: Basic Interfaces
    Autorzy:
    Godowski, P.
    Groso, A.
    Hoffmann, S.
    Onsgaard, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537740.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Fg
    68.55.Ac
    61.14.Hg
    79.60.Dp
    Opis:
    The interfaces: K/Cu(115) and CO/Cu(115) have been characterized using surface sensitive techniques, including low energy electron diffraction and photoelectron spectroscopy. K adatoms show tendency to occupy the sites close to the step edges. At low temperature (near 125 K), after completion of two layers, potassium grows in 3D islands (the Stranski-Krastanov mode). At higher temperature, e.g. at room temperature, potassium introduces reconstruction of the substrate even at low coverages. Calibration of the alkali coverage, up to completion of the first layer, using the work function changes curve has been confirmed as a very convenient and precise procedure. The adsorbed state of CO at 130 K has been identified by registration of core levels obtained by the use synchrotron radiation photoelectron spectroscopy. The characteristics of the main 1s and satellite peaks have been analyzed in context of substrate geometry and compared with the ones of other copper planes. There are no indications of dissociative adsorption of CO, only residual carbon and oxygen were found after adsorbate desorption around 220 K. CO molecules show a strong tendency to "on top" adsorption in sites far from the step edges of the Cu(115) surface.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 928-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Progress into Understanding of Alkali Metal Interaction with a Silicon Surface
    Autorzy:
    Soukiassian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892155.pdf
    Data publikacji:
    1992-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.-p
    73.20.At
    79.60.Eq
    82.65.My
    Opis:
    The atomic and electronic structure and interface formation of alkali metal (Na, K, Rb, Cs) and Si(100)2 × 1 surfaces is investigated by photoemission - XPS, UPS - using synchrotron radiation, scanning tunneling microscopy (STM) and by photoemission extended X-ray absorption fine structure (PEXAFS) experiments. The XPS-UPS results indicate that the alkali metal-silicon bond is a weak and polarized covalent bonding even at low coverages with adsorbate metallization at the monolayer. In contrast to III-V semiconductor surfaces, alkali metals do not induce significant structural changes of the surface: STM images performed with atomic resolution for the representative K/Si(100)2×1 systems demonstrate that, at one mono-layer coverage, the K atoms form one-dimensional linear metallic chains parallel to the Si dimers rows ⟨110⟩ direction and distant by 7.68 Å with a single site of adsorption. Below half a monolayer, the K atoms occupy various coexisting sites with no long range order. An ordering transition occurs around half a monolayer in which the adsorbate-adsorbate interaction, which was so far neglected in theoretical calculations, appears to be the leading driving force. The proposed models and concepts are discussed and compared to the latest state-of-art theoretical calculations.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 1; 19-32
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lysozyme Amyloid Fibrils Doped by Carbon Nanotubes
    Autorzy:
    Majorošová, J.
    Tomašovičová, N.
    Mitróová, Z.
    Rajňák, M.
    Girman, V.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030498.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.48.De
    68.37.Lp
    68.37.-d
    75.60.Ej
    87.14.Ee
    Opis:
    Production of new composites for the creation of modern materials with desired properties is the key feature of nanotechnology. Despite the well known advantages of magnetic nanoparticles, the aim of the present study was to synthesize lysozyme amyloid fibrils from hen egg white and subsequently doped this solution with single walled carbon nanotubes and with the magnetite Fe₃O₄ labelled single walled carbon nanotubes. Transmission electron microscopy and polarization optical microscopy were used to obtain the structural and dimensional information about samples. Measurements of magnetic properties indicate the considerable increase of the saturation magnetization for solutions included the magnetite nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 588-590
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PTCDI-C8 Adsorption on Si(100)
    Autorzy:
    Lament, K.
    Mazur, P.
    Zuber, S.
    Ciszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399078.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Pr
    79.60.-i
    68.37.Ef
    Opis:
    Adsorption of N, N'-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) on the Si(100) surface has been examined using X-ray photoelectron spectroscopy and scanning tunneling microscopy. X-ray photoelectron spectroscopy results show that the bonds are formed between the carbonyl groups of the molecules and the substrate. Scanning tunneling microscopy results show that the first and further layers are disordered.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 775-776
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxidation of Polycrystalline Chromium between 30°C and 400°C
    Autorzy:
    Thurner, G.
    Holloway, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892527.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.60.Bn
    68.55.Nq
    07.80.+x
    Opis:
    The formation of coalesced oxide films on atomically clean polycrystalline chromium has been studied with Auger electron spectroscopy and secondary ion mass spectrometry at temperatures between 30°C and 400°C. The data are consistent with an initialed chemisorption of oxygen on the clean Cr followed by nucleation of chromium oxide after 2 L of exposure followed by lateral growth to form a thin, coalesced, saturated oxide film about 0.8 nm thick at 30°C. The saturated oxide was thicker at higher temperatures, being about 80 nm thick at 400°C. Detection of a CrO$\text{}^{+}$ secondary ion was associated with chemisorbed oxygen, while O¯ ion originated from chromium oxides based upon correlation with chemical changes in the low-energy Auger spectra. Keating of the coalesced oxide caused considerable changes in both the low-energy Auger spectrum as well as the secondary ion emission. Both these as well as time-dependent, reversible changes in secondary ion emission were interpreted as structural rearrangements of the chromium oxide resulting in relative changes of oxygen either adsorbed on the surface or incorporated into chromium oxide.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 273-283
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of the Initial Growth of Co on Ru(0001)
    Autorzy:
    Godowski, P. J.
    Onsgaard, J. J.
    Trzebiatowska-Gusowska, M. J.
    Pater, K. J.
    Li, Zhe
    Powiązania:
    https://bibliotekanauki.pl/articles/2047268.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    79.60.Jv
    68.55.Jk
    Opis:
    The growth process of cobalt on Ru(0001) was characterized by photoelectron spectroscopy excited by X-ray and synchrotron radiation. The binding energy position and intensity of the Co 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ and Ru 3d$\text{}_{5}\text{}_{/}\text{}_{2}$ core levels as well as the shape and structure of the valence band spectra corresponding to the different stages of the deposition were investigated. An observed small positive binding energy shift is a consequence of an increase in the cobalt adatoms coordination number. The core-level shift between bulk and surface Ru atoms is determined as -360 meV. Upon adsorption of cobalt, the interface peak appears with a shift of -(70÷80) meV relative to the bulk one. On the basis of unchanged energy positions and widths of the Ru-derived features of the valence band spectra, a weak interaction between cobalt and substrate is suggested. The measured valence band could be reproduced by superimposing the spectra of the pure elements.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 263-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unusual Time Dependence of Magnetization Relaxation in MBE Grown Epilayer of CdMnTe
    Autorzy:
    Witowski, A. M.
    Moll, H. P.
    Wyder, P.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934049.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.Wm
    76.30.Fc
    Opis:
    The temporal behavior of the magnetization due to the spin-lattice relaxation for bulk and MBE grown epilayer of CdMnTe is compared. The time dependence of the epilayer magnetization changes (dM/dt) is nonmonotonic. After the main part, a second structure appears. It can be explained only by the assumption of energy storage and a delayed additional rise of specimen temperature. The nature of the storage is unknown.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 953-956
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Resonance Studies of La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$ Film under Stress
    Autorzy:
    Kundys, B.
    Dyakonov, V. P.
    Baran, M.
    Gierłowski, P.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037113.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.Jt
    75.80.+q
    68.60.Bs
    71.70.Ej
    Opis:
    Ferromagnetic resonance spectra of the La$\text{}_{0.67}$Ca$\text{}_{0.33}$MnO$\text{}_{3}$ ferromagnetic film deposited onto the x-cut LiNbO$\text{}_{3}$ substrate were investigated in a wide temperature range. The strain was mechanically introduced into the film using a special holder configuration. This leads to a shift of resonance field with respect to that of the as-grown sample. Analysis of the magnetic resonance shift, induced by a mechanical stress, allowed us to determine the magnetostriction constant λ$\text{}_{100}$. The magnetostriction determined in this way versus saturation magnetization could be well described by the Callen and Callen theory suggesting the domination of the single ion crystal field interaction in the sample being in the ferromagnetic state.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 133-139
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Near Field Optical Microscopy and Spectroscopy with STM and AFM Probes
    Autorzy:
    Bergossi, O.
    Bachelot, R.
    Wioland, H.
    Wurtz, G.
    Laddada, R.
    Adam, P. M.
    Bijeon, J. L.
    Royer, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968764.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.60.Pb
    42.62.Fi
    61.16.Ch
    68.35.Bs
    Opis:
    This article deals with a new generation of scanning near field optical microscopes (SNOM), called apertureless SNOM, based on metallic, semi-conductive or dielectric probes. The classification of the apertureless probe among the usual SNOM probes is discussed in the first part. Then, we present the different apertureless SNOM configurations that we develop, with various commercial AFM and home-made tungsten tips, and several illumination and collection modes. Finally, after a preliminary result in near field imaging, we propose a promising application of such microscopes dedicated to the near field fluorescence spectroscopy.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 393-398
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Emission Properties of GaN-Based Laser Diode Structures
    Autorzy:
    Godlewski, M.
    Phillips, M. R.
    Czernecki, R.
    Targowski, G.
    Perlin, P.
    Leszczyński, M.
    Figge, S.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043715.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.-z
    78.60.Hk
    68.37.Hk
    Opis:
    Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 675-680
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of selected organic compounds on the corrosion of historical glass based on their state of preservation
    Autorzy:
    Greiner-Wronowa, E.
    Świt, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058515.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.90.+n
    61.43.Fs
    07.60.Pb
    68.37.-d
    68.37.Hk
    81.70.-q
    07.07.Df
    07.75.+h
    81.40.Np
    Opis:
    The aim of this study was to investigate the influence of selected organic compounds such as acetic acid and formaldehyde on the historical glass objects of corrosion processes. This is a very important problem for the field of conservation and restoration of glass of art. Glass objects exhibited in museum display cases can be suffered by evaporating organic compounds which undergo to reaction with leached glass elements to create corrosion deposit on their surface. The proposed method called glass sensors has been used to identify results of impact of various external factors on the tested glass. Due to aggressive environment for the objects there created corrosion phenomena. Glass sensor were prepared as reproduced XVIII-cent. materials. The current studies were carried out by modern physico-chemical methods such as optical, metallography, scanning electron microscopy, inductively coupled plasma mass spectrometry and the Fourier transform infrared spectrometry. These techniques allow to determine the composition of the corrosion layers as well as their structure. The issues raised in this work have been studied following an interdisciplinary approach. The information obtained by using different techniques provides a valuable source of knowledge about the chemical reactions taking place on the surface of the glass. The results derived from this work are useful for the design and implementation of exhibition recommendations and better planning of conservation tasks.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1406-1414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Properties of Silicon δ-Doped Gaas in High Electron Density Regime
    Autorzy:
    Buyanov, A. V.
    Holtz, P. O.
    Pozina, G.
    Monemar, B.
    Thordson, J.
    Andersson, T. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968047.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.60.+g
    61.72.Vv
    68.55.Ln
    Opis:
    We report results for Si layers embedded in GaAs, extending from the delta-doped (δ-doped) range up to 6 monolayers derived by means of variable temperature resistivity and Hall effect measurements, secondary ion mass spectrometry and high resolution X-ray diffractometry techniques. The conductivity transition from free carrier transport in ordered δ-layers (<1 ML) to strongly-localized two-dimensional variable range hopping transport under potential fluctuation disordered conditions (>4 ML) is clearly observed. This observation is in good agreement with the secondary ion mass spectrometry and high resolution X-ray diffractometry data. Results from the intermediate case with 2-3 MLs are also discussed.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 727-732
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer and Magnetic Study of Fe+Vitroperm+Plastic System
    Autorzy:
    Brzózka, K.
    Kollár, P.
    Szumiata, T.
    Sovak, P.
    Füzer, J.
    Fáberová, M.
    Bureš, R.
    Górka, B.
    Gawroński, M.
    Gzik-Szumiata, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201075.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    68.35.bd
    76.80.+y
    75.60.-d
    72.80.Tm
    Opis:
    Phase composition and magnetization curves of the soft magnetic composites, fabricated by compaction of several kinds of powders mixed in various proportions, have been investigated by means of conversion electron Mössbauer spectroscopy and an alternating gradient force magnetometry. The results point to significant quantity of iron oxides - hematite and magnetite - at the surface of the samples. After the rubbing of thin surface layer, the relative content of oxides was distinctly reduced. Magnetic measurements revealed very similar characteristics of hysteresis curves for all the investigated materials.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 148-149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between Sample Morphology and Carrier Diffusion Length in GaN Thin Films
    Autorzy:
    Godlewski, M.
    Goldys, E. M.
    Phillips, M.
    Böttcher, T.
    Figge, S.
    Hommel, D.
    Czernecki, R.
    Prystawko, P.
    Leszczynski, M.
    Perlin, P.
    Wisniewski, P.
    Suski, T.
    Bockowski, M.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035593.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    61.72.Mm
    68.37.Hk
    78.60.Hk
    Opis:
    Scanning and spot-mode cathodoluminescence investigations of homo- and hetero-epitaxial GaN films indicate a surprisingly small influence of their microstructure on overall intensity of a light emission. This we explain by a correlation between structural quality of these films and diffusion length of free carriers and excitons. Diffusion length increases with improving structural quality of the samples, which, in turn, enhances the rate of nonradiative recombination on structural defects, such as dislocations.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 627-632
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Magnetic and Thermal Properties of $(Pb_ySn_{1-y})_2P_2S_6$ Chalcogenides
    Autorzy:
    Il'kovič, S.
    Reiffers, M.
    Šebeň, V.
    Šterbáková, K.
    Burger, V.
    Parma, L.
    Čobal', O.
    Rizak, I.
    Rizak, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419659.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.Kw
    62.50.-p
    65.40.Ba
    68.35.Rh
    Opis:
    The results of study of Pb influence on high temperature magnetic and thermal properties of the chalcogenides $(Pb_ySn_{1-y})_2P_2S_6$ are presented. The increasing Pb content shifts phase transition to the ferroelectric state at about 337 K towards lower temperatures while magnetic field till 3 T has no influence on this transition. The measured susceptibility and magnetisation data are discussed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 12-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Amorphous Carbon Thin Films Deposited on Si and PET: Study of Interface States
    Autorzy:
    Mariazzi, S.
    Macchi, C.
    Karwasz, G. P.
    Brusa, R. S.
    Laidani, N.
    Bartali, R.
    Gottardi, G.
    Anderle, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043339.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ac
    71.60.+z
    73.20.At
    78.70.Bj
    Opis:
    Thin carbon films with various thicknesses, deposited on different substrates (Si and poly-ethylene-terephthalate) at the same operating conditions in a radio frequency plasma enhanced chemical vapour deposition system were characterized by Doppler broadening spectroscopy. The films and the substrates were depth profiled by a slow positron beam. The aim of these measurements was to study the open volume structure and the interface of the films. It was found that, independently from the substrate, the films were homogeneous and exhibited the same open volume distribution. On the contrary, the effective positron diffusion length in the Si substrate was found to change with the thickness of the carbon films. This behaviour was interpreted as a change in the electric field at the carbon/silicon interface.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 842-847
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation
    Autorzy:
    Molčan, M.
    Hashim, A.
    Kováč, J.
    Rajňák, M.
    Kopčanský, P.
    Makowski, M.
    Gojzewski, H.
    Molokáč, M.
    Hvizdák, L.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368025.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    75.60.-d
    87.50.Y-
    68.37.-d
    Opis:
    Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite $(Fe_{3}O_{4})$ or greigite $(Fe_{3}S_{4})$ crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 198-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cathodoluminescence Profiling of InGaN-Based Quantum Well Structures and Laser Diodes - In-Plane Instabilities of Light Emission
    Autorzy:
    Godlewski, M.
    Ivanov, V. Yu.
    Goldys, E. M.
    Phillips, M.
    Böttcher, T.
    Figge, S.
    Hommel, D.
    Czernecki, R.
    Prystawko, P.
    Leszczynski, M.
    Perlin, P.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036870.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ff
    61.72.Mm
    68.37.Hk
    78.60.Hk
    Opis:
    Instabilities of light emission and also of stimulated emission in series of GaN epilayers and InGaN quantum well structures, including laser diode structures, are studied. A stimulated emission is observed under electron beam pumping. This enabled us to study light emission properties from laser structures and their relation to microstructure details. We demonstrate large in-plane fluctuations of light emission and that these fluctuations are also present for excitation densities larger than the threshold densities for the stimulated emission.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 689-694
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The microstructure and thermal stability of the two-component melt-spun Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS amorphous/amorphous composite
    Autorzy:
    Ziewiec, K.
    Wojciechowska, M.
    Prusik, K.
    Mucha, D.
    Jankowska-Sumara, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075849.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.J-
    81.05.Kf
    81.05.Pj
    72.15.Cz
    68.60.Dv
    Opis:
    The aim of this study is to present the special features and properties of the two alloys of similar average chemical composition Ni₅₅Fe₂₀Cu₅P₁₀B₁₀, processed through two different routes. The first alloy was melt-spun after the ejection of homogeneous liquid using a traditional single chamber crucible, and the second alloy was ejected from a double chamber crucible as two separate liquids: i.e., Ni₄₀Fe₄₀B₂₀ and Ni₇₀Cu₁₀P₂₀, mixing only at the orifice area. The studies of the microstructure of the composite alloy were performed through the use of transmission electron microscopy and scanning electron microscopy. The Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ two-chamber melt-spun (TCMS) alloy, as well as the homogeneous Ni₅₅Fe₂₀Cu₅P₁₀B₁₀, Ni₄₀Fe₄₀B₂₀, and Ni₇₀Cu₁₀P₂₀ alloys, were heated to elevated temperatures and their characteristics studied by means of differential scanning calorimetry. The temperature resistivity change method was applied to the examination of the Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS alloy. The phase composition after heat treatment was investigated using X-ray diffraction. The results of the microstructure examination show that the TCMS alloy is an amorphous/amorphous composite, and is notable for its Ni-Fe-B and Ni-Cu-P stripes resulting from its differentiated chemical composition. Another unique feature of the TCMS alloy is that it retains its wood-like morphology even after high-temperature heat treatment. The crystallisation of the TCMS alloy starts from the Ni-Cu-P constituent and ends with the Ni-Fe-B areas of the sample. The results are discussed on the basis of previous work completed on amorphous matrix composites.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 927-930
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-48 z 48

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