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    Wyświetlanie 1-13 z 13
    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:
    Energy Band and Absorption Coefficient of Quantum Dots in a Well Structure
    Autorzy:
    Zhang, P.
    Lu, X.
    Zhang, C.
    Yao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419887.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.63.Kv
    Opis:
    Building on the effective-mass envelope function theory, this paper focuses on the study of the energy band and the absorption coefficient of $InAs//In_{x}Ga_{1 - x}As$ quantum dots in a well (DWELL) structure. In contrast to $InAs//In_{0.15}Ga_{0.85}As$ quantum DWELL, the $InAs//In_{0.2}Ga_{0.8}As$ quantum DWELL has lower ground states. With the thickness of $In_{0.15}Ga_{0.85}As$ layer changing from 7 nm to 9 nm and $In_{0.2}Ga_{0.8}As$ layer changing from 9 nm to 12 nm, the calculation shows that their absorption coefficient spectra takes a red shift in the long-wave infrared and far-infrared ranges, respectively. Moreover, when the thickness of the $In_{x}Ga_{1 - x}As$ layer is defined as 9 nm, the absorption coefficient spectra of $InAs//In_{0.2}Ga_{0.8}As$ DWELL shows a obvious red shift comparing with that of $InAs//In_{0.15}Ga_{0.85}As$ DWELL.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 197-201
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies
    Autorzy:
    Zhang, P.
    Zhang, Y.
    Han, S.
    Yan, Q.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044762.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.20.Ng
    87.64.Je
    25.40.Fq
    82.30.Rs
    Opis:
    The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH$\text{}_{3}^{+}$ side was easy, whereas there was hardly exchange on the CH$\text{}_{2}$ side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 399-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The "Higgs" Amplitude Mode in Weak Ferromagnetic Metals
    Autorzy:
    Zhang, Yi
    Farinas, P.
    Bedell, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1383968.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.-b
    71.10.Ay
    75.50.Cc
    Opis:
    Using ferromagnetic Fermi liquid theory, Bedell and Blagoev derived the collective low-energy excitations of a weak ferromagnet. They obtained the well-known magnon (Nambu-Goldstone) mode and found a new gapped mode that was never studied in weak ferromagnetic metals. In this article we have identified this mode as the Higgs boson (amplitude mode) of a ferromagnetic metal. This is identified as the Higgs since it can be shown that it corresponds to a fluctuation of the amplitude of the order parameter. We use this model to describe the itinerant-electron ferromagnetic material MnSi. By fitting the model with the existing experimental results, we calculate the dynamical structure function and see well-defined peaks contributed from the magnon and the Higgs. Our estimates of the relative intensity of the Higgs amplitude mode suggest that it can be seen in neutron scattering experiments on MnSi.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 153-156
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solutions of One-Dimensional Effective Mass Schrödinger Equation for PT-Symmetric Scarf Potential
    Autorzy:
    Zhang, A.
    Shi, P.
    Ling, Y.
    Hua, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492765.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Fd
    03.65.Ge
    03.65.-w
    Opis:
    The one-dimensional effective mass Schrödinger equation for PT-symmetric Scarf potential is investigated. The analytical expressions of energy eigenvalue and corresponding wave function are presented. They are accomplished by using an appropriate coordinate transformation to map the transformed exactly solvable one-dimensional Schrödinger equation with constant mass into the position-dependent mass equation. In the computation, three different forms of mass distributions are considered.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6; 987-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation Amplification near an Autoionizing State
    Autorzy:
    Lambropoulos, P.
    Zhang, Jian
    Van Enk, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931394.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Rm
    32.80.Wr
    32.70.Jz
    Opis:
    We present an internally consistent theory of amplification near the minimum of autoionizing states with quantitative application to calcium. We have included a completely specified three-photon pumping and we find certain unusual aspects of the system. We find conditions under which the system remains in a steady state, although being coupled to the continuum. For incoherent pumping we obtain quantitative results for the gain. Our results and their extensions are also discussed in the context of present-day experimental possibilities.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 61-69
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Studies on the Local Structure and Spin Hamiltonian Parameters for Single Cu²⁺ Ion in BaF₂
    Autorzy:
    Lin, J.
    Xiao, P.
    Zhao, Y.
    Zhang, B.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398965.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    76.30.Fc
    Opis:
    The spin Hamiltonian parameters (g-factors and the hyperfine structure constants) and local structure are theoretically studied for single Cu²⁺ ion in BaF₂ from the high-order perturbation formulae of these parameters for 3d⁹ ions in tetragonally elongated octahedra. In the calculations, the ligand orbital and spin-orbit coupling of the impurity Cu²⁺ are taken into account, based on the cluster approach. Due to the Jahn-Teller effect and size mismatching substitution, the impurity Cu²⁺ is found to be located at a distance of about 0.2 Å from the nearest fluorine plane. The signs of the hyperfine structure constants $A_∥ $ and $ A_⊥ $ are suggested. The theoretical spin Hamiltonian parameters based on the above local structure are in good agreement with the observed values.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1173-1177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting density of states in B-doped diamond
    Autorzy:
    Onufriienko, O.
    Samuely, T.
    Zhang, G.
    Vanacken, J.
    Xu, Zheng
    May, P.
    Szabó, P.
    Moshchalkov, V.
    Samuely, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1052993.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Wz
    74.62.En
    74.55.+v
    Opis:
    In the presented work, we investigated the superconducting boron doped diamond polycrystalline film prepared by chemical vapor deposition by means of scanning tunneling microscopy/spectroscopy. Differential conductance spectra measured at various temperatures were used to obtain the values of superconducting critical temperature and energy gap. Comparing various theoretical models fitted to the differential conductance spectra measured at 0.5 K suggests weak pair breaking. However, this cannot account for the high 2Δ/(k_{B}T_{C}) ratio, which therefore indicates strong coupling.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1033-1035
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Magnetic Core in Magnetic Pulse Compression System
    Autorzy:
    Zhang, D.
    Yan, P.
    Sun, Y.
    Wang, J.
    Zhou, Y.
    Pan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807880.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Tp
    42.65.Re
    75.60.Ej
    Opis:
    In order to obtain the characteristics of magnetic core under ≈0.5-5 μs saturation time, a one-stage magnetic pulse compression circuit without external demagnetization circuits which are commonly used in magnetic compressors is designed. The current through the core is calculated by voltage across the resistive load, and the loop voltage is picked up with a single wire loop and integrated by software. B-H curves are derived from the measured voltage and current wave forms. B-H curves show that the core loss is in inverse proportion to the time to saturation, whereas the percentile core loss decreases as the charging energy increases. While the eddy current loss and dissipated energy are in direct proportion to dB/dt. The low inductance of magnetic switch indicates that the core is saturated and behaves as an air core. By applying custom characteristics to each stage in Pspice simulation, more practical energy transfer in magnetic pulse compression and the effects of leakage current are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1001-1003
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synchronization Study and Introductory Experiment οf Laser-Triggered Surface Flashover in Voltage Pulse
    Autorzy:
    Pan, R.
    Wang, J.
    Sun, Y.
    Sun, G.
    Yan, P.
    Zhang, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807974.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.-s
    51.50.+v
    Opis:
    With the aim of studying the characteristics of laser-triggered surface flashover in voltage pulse, synchronization problem of laser pulse and voltage pulse should be solved. A single/double harmonic, with wavelength λ of 1064/532 nm, Q-switched Nd:YAG laser is used to trigger the surface flashover. The synchronization problem is solved using a self-made digital delay/pulse generator. The delay time and jitter of Marx's trigger input and output, Marx's trigger output and Marx's output, laser input and output are respectively measured. Based on the result of the delay time and the timing sequence of the laser triggering system, the synchronization of laser pulse and voltage pulse is obtained through adjusting the channel delay time of digital delay/pulse generator. In addition, introductory experiment of laser-triggered surface flashover is carried out using the flat electrodes and columned insulators.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1167-1169
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Textures in Thin Ion-Irradiated Ni and Fe Films
    Autorzy:
    Lieb, K. P.
    Zhang, Kun
    Müller, G. A.
    Schaaf, P.
    Uhrmacher, M.
    Felsch, W.
    Münzenberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028981.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Bb
    75.70.Ak
    Opis:
    Heavy-ion bombardment of thin ferromagnetic, polycrystalline films can induce substantial changes of their magnetic and microstructural properties. Since we first identified this effect in 50-150 nm thick Fe and Ni films irradiated with Xe-ions, we made a systematic search for the influence of various film and implantation parameters on the orientation and degree of the magnetic anisotropy and how these parameters correlate with the microstructure of the films. Several analyzing methods, such as Rutherford backscattering, magneto-optical Kerr effect, X-ray diffraction, magnetic force microscopy, $\text{}^{111}$In perturbed angular correlation, and conversion electron Mössbauer spectroscopy, were employed in the investigation.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 751-760
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Study of GaN
    Autorzy:
    Zhang, X.
    Kung, P.
    Saxler, A.
    Walker, D.
    Wang, Τ.
    Razeghi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933686.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    71.55.Eq
    68.55.-a
    Opis:
    Photoluminescence study of undoped, doped GaN grown on (00.1), (11.0), (01.2)Al$\text{}_{2}$O$\text{}_{3}$ (100), (111)Si, and (00.1)6H-SiC substrates have been conducted. Strong bandedge emissions from all undoped samples and dopant-related emissions from doped samples were observed. Deep-level yellow emission centered around 2.2 eV was not observed from undoped GaN grown on 6H-SiC substrate, undoped GaN with optimum Ga source flow and doped GaN. The experiment data strongly suggest that Ga vacancies are the origin this deep-level emission.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 601-606
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence Decay Kinetics in GaN Studied by Frequency Domain Measurements
    Autorzy:
    Mickevičius, J.
    Vitta, P.
    Tamulaitis, G.
    Žukauskas, A.
    Shur, M.
    Zhang, J.
    Yang, J.
    Gaska, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813195.pdf
    Data publikacji:
    2008-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    78.55.Cr
    Opis:
    Carrier dynamics in high-quality GaN epilayer was investigated at two extreme excitation levels. Carrier lifetime under high excitation conditions was estimated by using light-induced transient grating technique. Measurements at extremely low excitation power density were performed by using frequency-domain fluorescence lifetime technique. The study was performed in a wide temperature range from 8 to 300 K. The results revealed the influence of donor-acceptor pair recombination and carrier trapping processes.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 3; 833-837
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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