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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys
    Autorzy:
    Pietrusiewicz, P.
    Błoch, K.
    Nabiałek, M.
    Walters, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385746.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    75.50.-y
    75.50.Kj
    75.30.Cr
    61.43.Dq
    76.80.+y
    61.05.Qr
    75.25.-j
    Opis:
    This paper features investigations into the influence of small additions of alloying elements on: structure, as well as the temporal and thermal stability of magnetic properties, and the disaccommodation effect, for the following amorphous alloys: Fe₆₁Co₁₀Y₈Me₁B₂₀ (where Me = Nb, W). The structure of the investigated samples has been confirmed by the Mössbauer spectroscopy. The obtained results indicate a strong correlation between the structure and the disaccommodation of the studied alloys. The Mössbauer studies reveal different configurations of atoms in the amorphous alloy samples, and the results indicate various potential barriers between orientations of atom pairs. For this reason, to describe the disaccommodation effect, the distribution of activation energy should be taken into account. The distribution of activation energy has been related to the distribution of relaxation times.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 397-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stimulated Scattering of Microcavity Polaritons
    Autorzy:
    Bloch, J.
    Senellart, P.
    Thierry-Mieg, V.
    Marzin, J. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014174.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Sa
    71.35.Lk
    71.36.+c
    78.30.Fs
    Opis:
    We report on cw optical experiments performed in a semiconductor microcavity containing a single quantum well in the strong coupling regime. Angularly resolved photoluminescence measurements under non-resonant excitation show the collapse of a relaxation bottleneck as the excitation power is increased. As a result, the emission close to k$\text{}_{∥}$=0 presents a non-linear behavior. In a two-beam experiment we resonantly inject polaritons at k$\text{}_{∥}$=0 and show that relaxation from states with large in-plane wave vector toward k$\text{}_{∥}$=0 is stimulated by the polariton final state population.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 295-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the Hysteresis Loop in Hard Magnetic Materials Using T(x) Model
    Autorzy:
    Dośpiał, M.
    Nabiałek, M.
    Szota, M.
    Pietrusiewicz, P.
    Gruszka, K.
    Błoch, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1201094.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.-d
    75.60.Jk
    75.50.Vv
    75.60.Ej
    Opis:
    Possibility of decomposing the static hysteresis loop is demonstrated. The applied method is related with decomposition of experimentally obtained reversal magnetization curve on the reversible and irreversible components. Results are applicable in analysis of reversal magnetization processes in hard magnetic materials and for simulation of hysteresis loop using hyperbolic T(x) model.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 170-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Relaxations in Amorphous $Fe_{61}Co_{10}Y_{8}Zr_{1}B_{20}$ Alloy
    Autorzy:
    Pietrusiewicz, P.
    Błoch, K.
    Gondro, J.
    Nabiałek, M.
    Dośpiał, M.
    Szota, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367356.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    75.50.-y
    75.50.Kj
    75.30.Cr
    Opis:
    Effects of annealing on the disaccommodation phenomenon in bulk metallic glasses (BMGs), obtained by injection-casting method have been studied. The amorphous structure has been confirmed using X-ray diffractometer. The annealing process has been performed at temperature below the crystallization temperature. For all investigated samples the disaccommodation curves have been determined. The susceptibility and its disaccommodation have been used in order to define thermal and time stability of magnetic properties. Obtained results have also been used to determine activation energies of elementary processes.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 106-107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time and Thermal Stability of Magnetic Properties in $Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20}$ Bulk Amorphous Alloys
    Autorzy:
    Błoch, K.
    Nabiałek, M.
    Pietrusiewicz, P.
    Gondro, J.
    Dośpiał, M.
    Szota, M.
    Gruszka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367363.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    75.50.-y
    75.50.Kj
    75.30.Cr
    Opis:
    The paper presents studies of time and thermal stability of magnetic properties in $Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20}$ bulk amorphous alloys. The investigated sample was prepared by suction-casting method in the form of plate. The structure was studied using X-ray diffractometry. It was found that alloy was amorphous in the as-cast state. The magnetic properties were determined using completely automated set up for measurement of susceptibility and its disaccommodation. The disaccommodation curve was decomposed into three elementary processes, each of them was described by Gaussian distribution of relaxation times. From fit of theoretical curve the peak temperature, intensity at peak temperature, average activation energies, distribution parameter and pre-exponential factor of the Arrhenius law were determined. The obtained results indicate that the disaccommodation phenomenon in studied samples is related with directional ordering of atom pairs near the free volumes.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 108-109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Polaritons in Semiconductor Micropillars
    Autorzy:
    Bajoni, D.
    Wertz, E.
    Senellart, P.
    Miard, A.
    Semenova, E.
    Lemaître, A.
    Sagnes, I.
    Bouchoule, S.
    Bloch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811905.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.36.+c
    78.45.+h
    78.55.Cr
    78.67.Pt
    Opis:
    We describe the physics of cavity polaritons in semiconductor micropillars. Cavity polaritons are exciton-photon entangled states arising from the strong coupling between excitons and the optical modes of a cavity. In micropillars, the photon three-dimensional confinement results in a discrete spectrum of 0D polariton states. Characterization of the linear properties of these micropillars will be presented. Then we will show how this system can be used to generate parametric photons and to obtain polariton lasing.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 933-943
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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