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Wyszukujesz frazę "Wasik, J." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Hydrostatic Pressure Study of MBE CdMnTe Doped with Bromine
    Autorzy:
    Szczytko, J.
    Wasik, D.
    Przybytek, J.
    Baj, M.
    Waag, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934026.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    73.61.Ga
    Opis:
    We present Hall effect and resistivity measurements as a function of pressure performed on MBE-grown Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te (with x = 0.14) layer (1 μm) doped with bromine. The experimental data were analysed using positive and negative U model of the Br centres. We found that both models could reproduce the experimental points, but in the case of positive U model - only under assumption that the sample was completely uncompensated.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 933-936
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Interference Effects in Visible-Near Infrared Spectral Range for Arrays of Vertically Aligned Multiwalled Carbon Nanotubes
    Autorzy:
    Wąsik, M.
    Judek, J.
    Świtkowski, K.
    Zdrojek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030331.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ci
    78.67.Ch
    81.07.De
    Opis:
    Based on the reflectance spectra for radiation wavelength from about 380 nm to 1.8 μm, the optical interference effects in vertically aligned multiwalled carbon nanotubes films are studied. We performed the measurements for two complementary polarization states of incoming radiation (s- and p-polarization) for nanotubes arrays sparse enough for interference effects to be possible to observe. By performing the measurements for different wavelengths and incidence angles, we mapped the evolution of interference maxima/minima of reflectance signal. The results from this novel approach indicate that for the radiation polarized perpendicularly to tubes axis (s-polarization), the real part of the effective refractive index can be estimated from the classic Fabry-Pérot model. In order to describe the differences between spectra obtained for s- and p-polarizations we discuss the most important factors that affect the reflectance signal in case of investigated nanotubes arrays.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 232-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Epitaxial Strain on Magnetic Anisotropy in (Ga,Mn)As
    Autorzy:
    Juszyński, P.
    Wasik, D.
    Gryglas-Borysiewicz, M.
    Przybytek, J.
    Szczytko, J.
    Twardowski, A.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403622.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.47.-m
    Opis:
    Two (Ga,Mn)As samples having different magnetic anisotropy (one with in-plane easy axis and another one with out-of-plane easy axis) were studied by means of magnetotransport experiments. Anisotropy field B_{A} was determined for both samples as a function of temperature. For the sample having in-plane easy axis, an inversion of the direction of planar Hall effect hysteresis was observed upon increase of temperature. This result was simulated using the Stoner-Wohlfarth model.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1004-1006
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MnAs Nanocrystals Embedded in GaAs
    Autorzy:
    Kwiatkowski, A.
    Wasik, D.
    Kamińska, M.
    Twardowski, A.
    Dłużewski, P.
    Borysiuk, J.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811951.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.75.+a
    Opis:
    Magnetic properties of MnAs nanocrystals embedded in GaAs are analyzed in the frame of phenomenological model proposed by Sasaki for ferritin superparamagnets. Our calculations explain qualitatively experimental data of magnetization versus temperature, obtained according to zero-field-cooled and field-cooled protocols. They show dynamics of magnetization of MnAs nanocrystals in range of temperature from 10 K to 320 K. There is transition from state in which very slow dynamics is observed (frozen state) to state in which dynamics is fast (quasi-superparamagnetic state).
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1207-1211
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MnAs Nanocrystals Embedded in GaAs
    Autorzy:
    Kwiatkowski, A.
    Borysiuk, J.
    Bożek, R.
    Wasik, D.
    Kamińska, M.
    Sadowski, J.
    Twardowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046925.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.+w
    61.82.Fk
    68.37.Rt
    68.37.Lp
    74.25.Ha
    Opis:
    We report on cross-sectional transmission electron microscopy and magnetic force microscopy studies performed on self-organized MnAs nanoclusters embedded in GaAs. It was found that 10÷20 nm large MnAs ferromagnetic nanocrystals were formed during rapid thermal annealing of Ga$\text{}_{1-x}$Mn$\text{}_{x}$As layers at 600ºC, leading to magnetic contrasts in magnetic force microscopy images.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 233-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Optical Studies of Homologous Series of Bicyclo[2,2,2]octane Derivatives with -NCS Terminal Group
    Autorzy:
    Herba, H.
    Żywucki, B.
    Czechowski, G.
    Bauman, D.
    Wąsik, A.
    Jadżyn, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933452.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.Gd
    77.22.Ch
    78.20.Fm
    Opis:
    The static dielectric constants and the optical birefringence for four members of the homologous series of bicyclo[2,2,2]octane derivatives with -NCS terminal group (pentyl to octyl) have been measured as a function of temperature. From the dielectric anisotropy, the optical birefringence as well as the polarized absorption spectra of the dichroic dye dissolved in the liquid crystalline host the order parameter has been determined. The results obtained by using various experimental methods have been compared with those calculated from the Maier-Saupe mean field theory. It has been found that the order parameter for the successive homologues shows alternation similar to that exhibited for the nematic-isotropic transition temperature.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 985-994
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial Correlations of Donor Charges in MBE CdTe
    Autorzy:
    Suski, T.
    Wiśniewski, P.
    Litwin-Staszewska, E.
    Wasik, D.
    Przybytek, J.
    Baj, M.
    Karczewski, G.
    Wojtowicz, T.
    Zakrzewski, A.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934021.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    71.55.Gs
    Opis:
    We present experimental evidence that at high pressures indium donors in CdTe localize electrons in spatially correlated manner. We have studied Hall mobility, μ$\text{}_{H}$, as a function of electron concentration, n$\text{}_{H}$, at T=77 K. Changes of n$\text{}_{H}$ have been achieved by two methods. High pressure freeze-out of electrons onto localized states of In-donors leads to the mobility enhancement with respect to the situation when n$\text{}_{H}$ has been modified by means of a subsequent annealing of the sample. As a result, depending on the degree of spatial correlations in the impurity charges arrangement, different values of μ$\text{}_{H}$ correspond to the same value of n$\text{}_{H}$. The variation of mobility with electron concentration suggests that the localized state of In-donor represents likely negatively charged DX state.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 929-932
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Physical Properties of SiC-GaAs Nano-Composites
    Autorzy:
    Kalisz, G.
    Grzanka, E.
    Wasik, D.
    Świderska-Środa, A.
    Gierlotka, S.
    Borysiuk, J.
    Kamińska, M.
    Twardowski, A.
    Pałosz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043724.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    07.35.+k
    Opis:
    Nano-composites consisting of primary phase of hard nanocrystalline SiC matrix and the secondary nanocrystalline semiconductor (GaAs) phase were obtained by high-pressure zone infiltration. The synthesis process occurs in three stages: (i) at room temperature the nanopowder of SiC is compacted along with GaAs under high pressure up to 8 GPa, (ii) the temperature is increased above the melting point of GaAs up to 1600~K and, the pores are being filled with liquid, (iii) upon cooling GaAs nanocrystallites grow in the pores. Synthesis of nano-composites was performed using a toroid-type high-pressure apparatus (IHPP of the Polish Academy of Sciences, Warsaw) and six-anvil cubic press (MAX-80 at HASYLAB, Hamburg). X-ray diffraction studies were performed using a laboratory D5000 Siemens diffractometer. Phase composition, grain size, and macrostrains present in the synthesized materials were examined. Microstructure of the composites was characterized using scanning electron microscopy and high resolution transmission electron microscopy. Far-infrared reflectivity measurements were used to determine built-in strain.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 717-721
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoluminescence Studies of GaN:Fe
    Autorzy:
    Niedźwiadek, A.
    Wysmołek, A.
    Wasik, D.
    Potemski, M.
    Szczytko, J.
    Kamińska, M.
    Twardowski, A.
    Łucznik, B.
    Pastuszka, B.
    Grzegory, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047373.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    71.55.Eq
    71.20.Be
    Opis:
    We report on magneto-optical studies on iron doped GaN crystals grown using hydride vapor phase epitaxy method on bulk GaN substrate. The investigated samples showed an intensive 1.3 eV luminescence band, characteristic of Fe$\text{}^{3+}$(d$\text{}^{5}$) center in GaN. A high quality of the investigated samples allowed us to observe a well-resolved fine structure of intracenter transitions between $\text{}^{4}$T$\text{}_{1}$(G) and $\text{}^{6}$A$\text{}_{1}$(S) states, consisting of four sharp no-phonon lines. All the observed no-phonon lines showed pronounced splittings in magnetic field. From the analysis of the magneto-optical data, the structure of split $\text{}^{4}$T$\text{}_{1}$(G) multiplet in the magnetic field applied along c-axis of GaN crystals was established.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 177-182
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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