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    Wyświetlanie 1-5 z 5
    Tytuł:
    EMR Spectra Thin Films Doped with High Concentration of Co and Cr on Quartz and Sapphire Substrates
    Autorzy:
    Cieniek, B.
    Stefaniuk, I.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030218.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bg
    75.30.Gw
    76.30.-v
    Opis:
    We have studied magnetic properties of zinc-oxide composite doped with high concentration (up to 20%) of Co and Cr ions. The pulsed laser deposition method was used to obtain samples on quartz glass and sapphire substrates. Samples were annealed at 100-250°C for ZnO on quartz substrate, and 300-700°C on sapphire substrate. EMR measurements were carried out and temperature dependence of the EMR spectra was obtained. The angular dependence in two samples orientation, vertical and horizontal, were also obtained. Analysis of the temperature dependences of the integral intensity of EMR spectra was carried out using the Curie-Weiss law.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 30-34
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of ZnO:Co thin films grown by the PLD method
    Autorzy:
    Cieniek, B.
    Stefaniuk, I.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146744.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron paramagnetic resonance (EPR)
    diluted magnetic semiconductor (DMS)
    ZnO:Co
    Curie temperature
    Opis:
    We have studied magnetic properties of zinc-oxide composite doped with a relatively high concentration (4%) of Co ions. Samples were obtained by the pulsed laser deposition (PLD) method with different parameters of the laser ablation. For various samples, the power of laser was changed as well as the temperature of sample heating. Electron paramagnetic resonance (EPR) measurements were carried out and temperature dependence of the EPR spectra was obtained. Analysis of the temperature dependences of the integral intensity of EPR spectra was carried out using the Curie-Weiss law. Fitting yields the following values θCW = 150 K and C = 1.6710, where C is the Curie constant, and θCW is the paramagnetic Curie temperature.
    Źródło:
    Nukleonika; 2013, 58, 3; 359-363
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of High Power Laser Beam on Physical Properties of Epitaxial Films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2)
    Autorzy:
    Kuźma, M.
    Abeynayake, C.
    Sheregii, E.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891472.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.60.Cs
    81.40.Rs
    Opis:
    Models have been proposed explaining differences in electrophysical and photoelectrical properties of epitaxial films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2) before and after treating by single pulses of Nd:YAG laser. These models were obtained on the basis of the calculated distributions of temperature, temperature gradient and concentration of interstitial mercury during and after exposing to the laser pulse. These calculations were done using the net method.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 475-479
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Spectra of Cr in CdTe Crystals
    Autorzy:
    Stefaniuk, I.
    Bester, M.
    Virt, I. S.
    Kuzma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043654.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Cr
    Opis:
    The EPR studies of CdTe:Cr were performed on X-band (9.6 GHz) spectrometer at room temperature. Single CdTe crystals were doped by chromium Cr in the synthesis process. The spectra observed were resolved into two spectra. The first one consisted of very broad line (Δ B=100 mT) and the second one showed a typical fine structure. The complete angular dependence measurements were obtained. The fine structure of Cr$\text{}^{2+}$ or Cr$\text{}^{3+}$ ions was assumed and simulated. It follows from the theoretical analysis of the obtained spectra that degree of ionization of the chromium Cr dopant is 3+.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 413-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of ZnO and ZnMnO Thin Films Obtained by Pulsed Laser Ablation
    Autorzy:
    Virt, I.
    Hadzaman, I.
    Bilyk, I.
    Rudyi, I.
    Kurilo, I.
    Frugynskyi, M.
    Potera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549722.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.15.Fg
    72.80.Ey
    78.20.Ci
    Opis:
    The results of experimental investigation of structural and physical properties of ZnO and ZnMnO films are presented in this work. The films of ZnO and $Zn_{1-x}Mn_{x}O$ of different thickness were obtained on $Al_{2}O_{3}$, glass, and KCl substrates in vacuum of 1 × $10^{-5}$ Torr by the pulsed laser deposition method. The samples were obtained under the substrate temperature 300-473 K. A thickness of films was in the range of 0.5-1 μm depending on the number of laser pulses. The structure of target bulk materials was investigated by X-ray diffraction method. A structure of laser deposited films was investigated by the transmission high-energy electron diffraction method. Electric resistivity was measured in the temperature range 77-450 K. The presence of two activation energies in the temperature range 300-330 K and 330-450 K is followed from the analysis of the films electrical resistivity. These activation energies correspond to two deep donor's energy levels. The shallow donor's level is connected with manganese presence. Optical transmission of ZnO and ZnMnO films deposited at various temperatures were investigated.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 34-37
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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