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    Wyświetlanie 1-7 z 7
    Tytuł:
    Correlations of Mechanical Stresses and Magnetical Behaviour of Ion Implanted Magneto-Optical Layers
    Autorzy:
    Hubenthal, F.
    Röll, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013020.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ww
    Opis:
    Magneto-optical materials such as TbFeCo are used for data storage in a wide range. Especially the perpendicular magnetic anisotropy is necessary for high density recording. But the origin of the perpendicular magnetic anisotropy in these magneto-optical layers is not exactly known. In our experiments magneto-optical layers were implanted with heavy ions, with the aim to change the magnetic behaviour of these layers. After the implantation there is a dramatical change in the magnetical and mechanical behaviour, too.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 427-430
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence of Er$\text{}^{3+}$ near 1.54μm in Silicon-Rich Silicon Oxide Films
    Autorzy:
    Kuritsyn, D.
    Glukchanyuk, V.
    Przybylińska, H.
    Kozanecki, A.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028779.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ww
    78.55.Hx
    Opis:
    Excitation of the intra-4f-shell luminescence near 1.5μm in silicon-rich silicon oxide is studied. Silicon-rich silicon oxide was produced by high dose implantation of Si$\text{}^{+}$ ions into SiO$\text{}_{2}$ layers grown on silicon. Erbium doping was also performed using implantation of Er^+ ions at an energy of 800 keV. An evidence is presented that transfer of energy from defects related to excess silicon in silica is the dominant mechanism of excitation of Er$\text{}^{3+}$ for optical pumping in the UV-blue wavelength range. Si-nanocrystals created by annealing at 1100ºC rather compete for excitation with erbium than transfer energy to Er$\text{}^{3+}$.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 437-442
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared Luminescence in Er and Er+O Implanted 6H SiC
    Autorzy:
    Kozanecki, A.
    Jantsch, W.
    Heis, W.
    Prechtl, G.
    Sealy, B. J.
    Jeynes, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968292.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ww
    71.55.-i
    78.55.-m
    Opis:
    Photoluminescence in the neighbourhood of 1.54 μm due to the $\text{}^{4}$I$\text{}_{13}\text{}_{/}\text{}_{2}$ -$\text{}^{4}$I$\text{}_{15}\text{}_{/}\text{}_{2}$ intra-4f-shell transitions of Er$\text{}^{3+}$ ions in 6H SiC is studied. Effects of oxygen coimplantation is also investigated. No difference in the photoluminescence spectra of Er only and Er+O implanted SiC was found. It is concluded that the emission around 1.54 μm in SiC:Er originates from erbium-oxygen complexes, which are formed as a result of thermal annealing.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 879-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion and Absorption of Longitudinal Electro-Kinetic Waves in Magnetized Ion-Implanted Semiconductor Plasmas
    Autorzy:
    Ghosh, S.
    Thakur, Preeti
    Powiązania:
    https://bibliotekanauki.pl/articles/2047263.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.35.Fp
    61.72.Ww
    82.70.Dd
    Opis:
    The instability of longitudinal electro-kinetic wave that is propagating across the magnetic field B$\text{}_{0}$ in ion-implanted group-IV semiconductor sample consisting of non-drifting electrons, holes, and negatively charged colloids is investigated. Using hydrodynamic approach, a compact dispersion relation D(ω,k) is derived for the same. The propagation and amplification characteristics of the wave in collision dominated regime are studied numerically in detail for slow and fast modes. Results show that the presence of transverse magnetic field is responsible for the modification of the existing wave spectra of the slow electro-kinetic branch. In case of fast electro-kinetic wave, the presence of magnetic field is found responsible for excitation and amplification of a new mode. It is also found that the magnetic field is responsible for the conversion of two existing aperiodic modes into periodic ones. These novel periodic modes are found to be counter-propagating in nature.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 247-256
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orientation of Single Dibenzanthanthrene Molecules in Solid Xenon
    Autorzy:
    Sepioł, J.
    Kołos, R.
    Jasny, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814017.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    61.66.Bi
    61.66.Hq
    61.72.Ww
    Opis:
    The spatial distributions of individual dibenzanthanthrene electronic transition dipole moments in solid Xe was investigated at the single molecule level, with the high-resolution fluorescence spectroscopy. Samples were prepared by the co-deposition of dibenzanthanthrene/Xe vapours onto the 50 K surface. The results indicate that the orientation of planar aromatic molecules is preferentially parallel to the trapping surface.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-121-S-126
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Raman Study on Doped Multiwalled Carbon Nanotubes
    Autorzy:
    Costa, S.
    Borowiak-Palen, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807799.pdf
    Data publikacji:
    2009-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Ch
    73.22.-f
    81.07.De
    61.72.Ww
    63.20.-e
    Opis:
    In the present study we report resonance Raman study on multiwalled carbon nanotubes treated with HCl, $HNO_3$ and $H_2SO_4$. Acids are commonly used in purification procedures in order to remove catalyst particles from the as-produced material. However, it is known that acid treatments in multiwalled carbon nanotubes can induce a surface functionalisation and intercalation of the walls, modifying their electronic properties. Here, we present a comparative study between samples of multiwalled carbon nanotubes modified with the most common acids used in the purification of carbon materials, and the influence of the acid treatment time on their vibronic properties. The samples were analysed via the Raman spectroscopy using the laser length of 785 nm. The presented data reveal the modification of the typical multiwalled carbon nanotubes Raman bands such as: disorder band (D band), the graphite band (G band), and the two-phonon second order Raman band (G' band). The last one shows a broadening effect on its line shape and the appearance of an additional peak. All the treatments enhance the number of defects in the graphitic structure of multiwalled carbon nanotubes.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 1; 32-35
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Nano-Crystalline Barium Ferrite Synthesized by Different Synthesis Route
    Autorzy:
    Ovalioglu, H.
    Sozeri, H.
    Kabaer, M.
    Kucuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535266.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.50.Ss
    75.50.Ww
    61.72.U-
    Opis:
    We have synthesized $Ba_{1-x}La_{x}Fe_{12}O_{19}$ (0 ≤ x ≤ 0.4) and $BaFe_{12-y}Nd_{y}O_{19}$ (0 ≤ y ≤ 4) samples in ammonium nitrate melt and nitric acid. The effects of La and Nd doping on the microstructure and magnetic properties of $BaFe_{12}O_{19}$ were investigated. The highest coercive field was obtained for the sample having La content, x = 0.3.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1020-1021
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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