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Wyszukujesz frazę "Zhang, M. Y." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of Granule Shape on the Giant Magnetoresistance for Ferromagnetic Metal-Metal Granular Films
    Autorzy:
    Wang, C.
    Zhang, P.
    Zhang, Y.
    Rong, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1814027.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    75.47.-m
    75.50.-y
    Opis:
    In order to investigate the effect of granule shape on the giant magnetoresistance, assuming that granular films consist of ellipsoidal ferromagnetic granules embedded in a nonmagnetic metal matrix and the ellipsoidal granules have different demagnetizing factors in three directions, we combined two-current model with the effective medium theory to investigate the effect of granule shape on the giant magnetoresistance. The results revealed that the giant magnetoresistance in granular films depended strongly on the granule shape and was between those for current perpendicular to the plane of the layers and current in the plane of the layers in magnetic multilayers.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 6; 1231-1238
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Magnetic Properties of Magnetron-Sputtered [Fe/Pt]ₙ Multilayer Films
    Autorzy:
    Zhang, Y.
    Yu, W.
    Chen, F.
    Liu, M.
    Li, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401879.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    75.50.Ss
    Opis:
    [Fe/Pt]ₙ multilayer films were prepared on thermally oxidized Si (100) substrates at 300°C using dc magnetron sputtering and annealed for different temperature ranging from 350 to 500°C. It is found that the as-deposited [Fe/Pt]ₙ multilayer films exhibit well-resolved periodic structures and low roughness of interface. The ordering degree of the annealed films decreases and their perpendicular magnetic anisotropy deteriorates with increasing the period number. Fe/Pt bilayer film annealed at 350°C shows (001) orientation and hard magnetic characteristic, the coercivity and perpendicular anisotropy enhance with increase of annealing temperature. In addition, the hard and soft magnetic phases are not fully magnetically coupled in the Fe/Pt film annealed at higher temperature.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 326-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Oxygen Deficient Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{3-δ}$
    Autorzy:
    Zhang, Y. F.
    Sasaki, S.
    Yanagisawa, O.
    Izumi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047221.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ga
    75.60.-d
    75.70.Rf
    81.40.Rs
    Opis:
    We studied magnetic properties of perovskite-type Y$\text{}_{0.33}$Sr$\text{}_{0.67}$ CoO$\text{}_{2.614}$ and Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ prepared under different sintered temperatures at 1250ºC and 1100ºC, respectively. A dc magnetization jump associated with a large thermal hysteresis around 180 K was found in Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.614}$, which indicates a kind of magnetic memory effect. On the other hand, Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ shows a larger magnetization with a small magnetization jump around 200 K and lower Curie temperature than those of Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.614}$. Rich Co$\text{}^{3+}$ ions in the low temperature sintered Y$\text{}_{0.33}$Sr$\text{}_{0.67}$CoO$\text{}_{2.707}$ possibly introduce large magnetization and high magnetization jump temperature. This may be coming from a surface/volume effect of Co$\text{}^{3+}$ ions appearing in the polycrystalline sample prepared at low temperature. The ferromagnetism resulted from the different surface/volume ratio contributes to a part of magnetization and may result in the change of the Curie temperature.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 79-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of $YVO_4$ Phosphor Powder
    Autorzy:
    Zhang, S.
    Liang, Y.
    Gao, X.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207386.pdf
    Data publikacji:
    2014-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    42.70.Hj
    78.67.-n
    Opis:
    The phonon energy of $YVO_4$ crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize $YVO_4$ phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The $YVO_4$ phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the $YVO_4$ originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only $2.8188 × 10^{-21} J$, $YVO_4$ helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized $YVO_4$ powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of $YVO_4$ powders is annihilated, and a broadband emission of $VO_4^{3-}$ near 450 nm is observed at room temperature. The $YVO_4$ phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 1; 105-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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