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    Wyświetlanie 1-8 z 8
    Tytuł:
    Oxidation Kinetics of Thin and Ultrathin Fe Films
    Autorzy:
    Marczyńska, A.
    Skoryna, J.
    Lewandowski, M.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387032.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    We have studied oxidation kinetics of Fe thin films under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are practically nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in ferromagnetism. Fe thin films were deposited onto 1.5 nm V thick buffer layer using UHV magnetron sputtering. As a substrate we have used Si(100) wafers with an oxidised surface. Results show that all samples with an initial Fe thickness greater than 6 nm oxidize practically instantaneously, whereby a constant amount of 2.5 nm of metal is transformed into oxides. For iron thickness lower than 6 nm the time constant for oxidation increases considerably reaching a value of 30 days for the initial Fe thickness equal to 4 nm.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 549-551
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling and Proximity Effect in V-Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Synoradzki, K.
    Pugaczowa-Michalska, M.
    Toliński, T.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030414.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    We have studied interlayer exchange coupling (IEC) in (110) oriented V/Fe multilayers with ultrathin sublayers up to 7 monolayers (ML). Results showed that IEC energy depends on both vanadium and iron layer thicknesses. The local maxima of the antiferromagnetic coupling were found for V(7 ML)/Fe(4 ML) and V(3 ML)/Fe(3 ML) multilayers (MLs). The strongest AFM coupling energy of about 1.0 mJ/m² was measured at 5 K for the V(7 ML)/Fe(4 ML) multilayer. The position of the AFM peak for V(X ML)/Fe(3 ML) MLs near 3 ML of V spacer was also revealed by ab-initio calculations. Furthermore, theoretical calculations show an induced negative magnetic moment on V atoms near the V-Fe and Fe-V interfaces due to the proximity effect.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Nb/Fe Multilayers
    Autorzy:
    Marczyńska, A.
    Pugaczowa-Michalska, M.
    Szymański, B.
    Majchrzycki, Ł.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030764.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    The (110) oriented Nb-Fe multilayers (MLs) with constant Fe and variable Nb sublayer thicknesses were prepared at room temperature using UHV magnetron sputtering. The artificial periodicity was revealed by intense satellite peaks in the low- and high-angle X-ray diffraction patterns. Magnetic hysteresis loop measurements at 5 K revealed antiferromagnetic (AF) exchange coupling of the Fe sublayers for Nb spacer thickness of about 3 monolayers. The corresponding AF coupling energy is equal to about -1.36 mJ/m². The Nb spacer thickness corresponding to the position of the AF peak is in good agreement with ab-initio calculations within localized spin density approximations of exchange-correlation potential.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 605-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of Exchange Coupling in Fe/Nb/Fe/Pd Layered Structures using Hydrogen
    Autorzy:
    Wachowiak, M.
    Marczyńska, A.
    Dawczak-Dębicki, H.
    Pugaczowa-Michalska, M.
    Pacanowski, S.
    Majchrzycki, Ł.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030744.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    Fe/Nb/Fe trilayers were prepared at room temperature using UHV magnetron sputtering. The interlayer exchange coupling energy was determined from a shift of the minor hysteresis loop from the origin. Results showed clear antiferromagnetic (AF) coupling maxima near ım6 and 9 monolayers of Nb spacer. Calculations of the interlayer exchange coupling energy were carried out using ab-initio method with localized spin density approximations of exchange-correlation potential. The experimental results were in good agreement with ab-initio calculations. Furthermore, the position of the AF peaks and coupling energy values could be modified using hydrogen.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 609-612
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange coupling effects in naturally oxidised ultrathin iron film
    Autorzy:
    Dawczak-Dębicki, H.
    Marczyńska, A.
    Rogowska, A.
    Wachowiak, M.
    Nowicki, M.
    Pacanowski, S.
    Jabłoński, B.
    Czajka, R.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050673.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.70.Kw
    Opis:
    Oxidation process of Fe films under atmospheric conditions is depth limited such that an oxide covering layer with a well-defined thickness is formed by which the underlying metal is prevented from further oxidation. Iron thin film with an initial thickness d_{i}=4 nm was deposited onto 1.6 nm - V(110) buffer layer using UHV magnetron sputtering. The planar growth of Fe oxides was revealed by atomic force microscopy. X-ray photoelectron spectroscopy studies performed after 250 days of oxidation revealed formation of a hematite (α-Fe₂O₃) ultrathin film on the metallic rest of iron. Furthermore, low temperature magnetic measurements of the oxidised Fe ultrathin film revealed an exchange anisotropy which is imposed to the metallic rest. As a result, we have observed at low temperatures a shift and broadening of the hysteresis loops due to the exchange interaction at the metal-oxide interface.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 601-604
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Valence Band Modifications on Hydrogen Absorption in Zr-Pd Alloy Thin Films
    Autorzy:
    Jabłoński, B.
    Pacanowski, S.
    Werwiński, M.
    Marczyńska, A.
    Dawczak-Dębicki, H.
    Szajek, A.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030742.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    82.80.Pv
    Opis:
    We study the valence band modifications of in-situ prepared nano- and polycrystalline Pd-Zr alloy thin films using X-ray photoelectron spectroscopy. Results were compared with valence bands calculated by ab initio methods. Furthermore, hydrogen absorption and desorption kinetics under pressure of about 570 mbar were studied in Pd covered nanocrystalline ZrPd₂ alloy thin film. Results showed that modifications of the valence band of the nanocrystalline alloy thin film could significantly influence on hydrogen absorption and desorption process.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 620-623
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XPS and UPS Valence Band Studies of Nanocrystalline Ni-Ti Alloy Thin Films
    Autorzy:
    Pacanowski, S.
    Skoryna, J.
    Szajek, A.
    Marczyńska, A.
    Dawczak-Dębicki, H.
    Werwiński, M.
    Majchrzycki, Ł.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030748.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.22.-f
    68.55.-a
    82.80.Pv
    Opis:
    In this contribution we study valence bands of in-situ prepared nanocrystalline NiTi and Ni₃Ti alloy thin films using X-ray and ultraviolet photoelectron spectroscopy. Additionally, theoretical valence band of NiTi alloy was calculated by ab-initio methods. The structure and morphology of the samples were studied by X-ray diffraction and atomic force microscopy, respectively. Furthermore, hydrogen absorption and desorption kinetics at a pressure of about 1000 mbar were studied in Pd covered nanocrystalline NiTi alloy thin film using four-point resistivity measurements. Results showed that modifications of the valence bands of the Ni-Ti thin films due nanocrystalline structure can influence on the room temperature hydrogen absorption and desorption kinetics.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 613-616
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural xidation of thin Fe films on V buffer layer
    Autorzy:
    Dawczak-Dębicki, H.
    Marczyńska, A.
    Rogowska, A.
    Wachowiak, M.
    Nowicki, M.
    Pacanowski, S.
    Jabłoński, B.
    Kowalski, W.
    Grembowski, J.
    Czajka, R.
    Smardz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1055062.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    68.55.-a
    Opis:
    We have studied oxidation kinetics of Fe thin film under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are approximately nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in total Fe magnetic moment. Results show that the sample with an initial Fe thickness equal to 10 nm oxidize relatively fast (time constant τ=0.05 day), whereby a constant amount of 2.5 nm of metal is transformed into oxides. For lower iron initial thickness (d_{i}=4 nm) the time constant for oxidation significantly increases reaching a value of 2 days. Furthermore, X-ray photoelectron spectroscopy studies performed after 144 days of oxidation revealed formation of hematite (α-Fe₂O₃) thin film on the metallic rest of iron.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1272-1276
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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