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    Wyświetlanie 1-10 z 10
    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:
    Low Field Magnetic Properties of FeCo-Based Alloys
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Łukiewska, A.
    Kaleta, J.
    Zbroszczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1378307.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.Kj
    75.60.Lr
    71.55.Jv
    Opis:
    Low field magnetic properties of amorphous $(Fe_{x}Co_{1})_{76}Mo_{8}Cu_{1}B_{15}$ alloys (x=3, 6 and 9) were characterized by magnetic after-effect and initial magnetic susceptibility. Activation energies and pre-exponential factors of the Arrhenius law that were derived from the disaccommodation curves are of about 1.188 eV and $10^{-15}$ s, respectively. Local magnetic arrangement was investigated by $\text{}^{57}Fe$ Mössbauer spectrometry. The average hyperfine magnetic field decreases with increasing Fe/Co ratio due to smaller relative contribution of cobalt. The overall magnetic parameters of the alloy prove its good soft magnetic properties with an application potential.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 118-119
    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:
    Stable and Metastable Phases in the Atomic Limit of the Extended Hubbard Model with Intersite Density-Density Interactions
    Autorzy:
    Kapcia, K.
    Robaszkiewicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426712.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.10.Fd
    71.45.Lr
    64.60.My
    64.75.Gh
    71.10.Hf
    Opis:
    We have studied a simple effective model of charge ordered insulators. The tight binding Hamiltonian consists of the effective on-site interaction U and the intersite density-density interaction $W_{ij}$ (both: nearest-neighbor and next-nearest-neighbor). In the analysis of the phase diagrams and thermodynamic properties of this model we have adopted the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. Our investigations of the general case (as a function of the electron concentration n) have shown that the system exhibits various critical behaviors including among others bicritical, tricritical, critical-end, and isolated critical points. In this report we concentrate on the metastable phases and transitions between them. One finds that the first- and second order transitions between metastable phases can exist in the system. These transitions occur in the neighborhood of first as well as second order transitions between stable phases. For the case of on-site attraction the regions of metastable homogeneous phases occurrence inside the ranges of phase separated states stability have been also determined.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1029-1031
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Magnetization Reversal of Thin Manganite Film
    Autorzy:
    Uspenskaya, L.
    Nurgaliev, T.
    Miteva, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550567.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Hx
    75.47.Lx
    75.60.Jk
    75.60.Lr
    75.70.Ak
    75.70.Kw
    Opis:
    The magnetic domain structure, its transformation with temperature, and the magnetization reversal in 20 nm $La_{0.7}Sr_{0.3}MnO_{3}$ film grown on $LaAlO_{3}$ substrate by off-axis magnetron sputtering at 700°C and post-annealed at 600°C were studied in a wide temperature range. The magnetic domains with either in-plane- or out-of-plane-orientation of the vector of spontaneous magnetization were observed in the same film depending on the prehistory. The domains with the in-plane magnetization were found to be more stable. Magnetization reversal of the film was shown to occur via the nucleation and motion of 180-degree head-to-head domain walls, the number and the type of which were found to be dependent on temperature. Moreover, the transition between two magnetization reversal regimes was found at 30 K.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 207-210
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow Relaxation of Resistance in Manganite Perovskite Nanoconstrictions
    Autorzy:
    Baszyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810570.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    75.50.Pp
    Opis:
    The time decay of the surface resistance $R_{S}(t)$ was measured for the $La_{0.7}Sr_{0.3}MnO_{3}$ perovskite nanocontacts obtained by break technique at liquid nitrogen. The corresponding time relaxation can be described by two-term formula: stretched exponential function and logarithmic dependence. The characteristic times $τ_{1}$ and $τ_{2}$ of the relaxation processes are of order of seconds and few tens of seconds, respectively. The appearance of both contributions evidences the existence of two sources of relaxation, which can be assigned to inhomogeneous changes of the angle between the magnetic moments of the neighboring Mn ions inside spin blocks $(τ_{1})$ and between the spin blocks $(τ_{2})$ occurring near surface of the nano-electrodes. Similar to magnetic viscosity, the dependence of resistance viscosity $S_{R}$ on basis current is characterized by bell-shaped curve. These results point out the important role of the structural arrangements of the Mn-ions into spin blocks on the surfaces electrodes of the nanocontact.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 339-341
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Permeability After-Effect and Analysis of Power Losses in Ferromagnetic Co-Based Amorphous Alloy
    Autorzy:
    Kravčák, J.
    Varga, R.
    Vojtaník, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813518.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Gb
    75.60.Ch
    75.60.Lr
    Opis:
    Complex permeability $(μ=μ_1-iμ_2)$ after-effect of near-zero magnetostrictive CoFeCrSiB amorphous alloy was investigated in magnetic field H (t)= $H_0$ exp ( i 2π f t) after demagnetization. For frequencies f from 200 Hz to 2000 Hz and for the small amplitude H_0 < $H_{cr}$ we observed practically constant both real $μ_1$ and imaginary part $μ_2$ of permeability. A measured small decrease in the real part $μ_1$ and increase in the imaginary part $μ_2$ with frequency f were theoretically calculated for a quadratic form of a domain wall potential $E_S$ (x)=1/2α $x^2$. The calculated loss factortan δ = $μ_2 μ_1$, which is small at amplitude $H_0$ < $H_{cr}$, corresponds to power losses due to eddy currents induced around reversibly moving domain walls.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 43-46
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Perminvar Effect in Amorphous Hitperm Alloy
    Autorzy:
    Varga, M.
    Varga, R.
    Vojtanik, P.
    Komova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813579.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Lr
    Opis:
    Influence of the directional ordering on magnetization processes in the amorphous $Fe_{44.5}Co_{44.5}Zr_7B_4$ alloy was investigated in the temperature region of 27 to 300°C for stabilization times of up to 1000 min by means of the Perminvar effect. The time-temperature dependent Perminvar effect was found to be very sensitive on the stage of the domain structure stabilization. The Perminvar critical fields $H_{CR}$ were shifted to higher values with increasing stabilization temperatures and times. At lower temperatures, the susceptibility increases over wide range of the measuring fields. Stabilization at higher temperatures causes that the susceptibility abruptly increases in the narrow field range. The record critical field $H_{CR} =246 Am^{-1}$ was obtained.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 119-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Susceptibility Disaccommodation and Mössbauer Effect in Microcrystalline Fe-Si Ribbons
    Autorzy:
    Ciurzyńska, W. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013343.pdf
    Data publikacji:
    2000-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    76.80.+y
    Opis:
    The magnetic susceptibility disaccommodation of the microcrystalline Fe-xSi (x=3, 5, 6.5, and 7.2 wt%) ribbons in the as-quenched state and after annealing at 1370 K for 1 h was investigated in the temperature range from 220 to 410 K. Simultaneously, the microstructure of those samples was studied using the Mössbauer spectroscopy. It is found that the isochronal disaccommodation curves may be decomposed into five elementary processes. Taking into account the results obtained from the Mössbauer spectra analysis, the relaxational process with activation energy equal to 0.84 eV may be considered as the Snoek relaxation. However, the relaxational processes of higher activation energy seem to be connected with jumps of C atoms in the vicinity of Fe atoms surrounded by 1, 2, 3, and 4 silicon atoms.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 4; 719-728
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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