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    Wyświetlanie 1-46 z 46
    Tytuł:
    Impurity Self-Screening
    Autorzy:
    Wilamowski, Z.
    Przybylińska, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929774.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.45.-d
    72.10.Fk
    Opis:
    In a mixed valence impurity system the distribution of impurity charges can be adjusted to minimize the Coulomb energy of inter-impurity interactions. In this paper we discuss the possibility of extending the methods of analytical evaluation of the pair correlation function for classical liquids to apply to a system with a built-in disorder, where the occupation probability is governed by the Fermi-Dirac statistics.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 832-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dyakonov--Perel Spin Relaxation Suppressed by an Applied Magnetic Field
    Autorzy:
    Wilamowski, Z.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036865.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Rb
    73.21.Fg
    85.75.-d
    Opis:
    We observe a strong anisotropy of spin relaxation and a decrease in the spin relaxation rate with increasing electron mobility in contrast to predictions of the classical D'yakonov-Perel spin relaxation model. We show that for high electron mobility the cyclotron motion causes an additional modulation of spin-orbit coupling, leading to an effective suppression of the spin relaxation rate.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 671-674
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Destruction of Antiferromagnetic Order by Localized Polarons
    Autorzy:
    Wilamowski, Z.
    Hankiewicz, E. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013011.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    75.10.-b
    74.20.Mn
    Opis:
    Analysis of a finite spin cluster indicates a possibility of the formation of purely magnetic polarons in low-dimensional antiferromagnets. It is shown that for parameters characteristic of CuO$\text{}_{2}$ based superconductors a strong antiferromagnetic polaron can occur. The destruction of antiferromagnetic order by the presence of a magnetic polaron is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 403-406
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DX Puzzle: Where Are We Now?
    Autorzy:
    Wilamowski, Z.
    Suski, T.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920958.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    71.55.-i
    Opis:
    A brief review of the experimental data on the metastable DX-centers in AlGaAs is presented. The experimental proofs of the two-electron nature and of the intermediate, one-electron state of the DX-centers are discussed. We collect the available experimental data on the ground state, electron-emission and capture energies and we discuss the nature of the lattice barrier. The effect of splitting of these energies in AlGaAs alloys and the consequences of the splitting on the capture and emission kinetics are analyzed. The different character of the barrier and of the alloy splitting for donors of the IV and VI group is underlined. The necessity to consider the interdonor Coulomb interaction when discussing the experimental data is also pointed out.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 561-571
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coulomb versus Madelung Gap: Ordering in a System of Point Charges
    Autorzy:
    Sobkowicz, P.
    Wilamowski, Z.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929618.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    72.20.Fr
    Opis:
    Spatial correlations of impurity charges in a mixed valence regime are studied with the use of Monte Carlo simulations. The influence of various kinds of disorder on the one-particle density of states is determined. A continuous transitions from a "soft" Coulomb gap (density of states vanishing only at the chemical potential) to a "hard" gap (with a finite range of energies with vanishing density of states) is found, driven by decreasing amount of built-in disorder in the system. The "hard" Coulomb gap resembles the Madelung gap, found in crystalline arrangements of charges. The similarity reflects the fact that both the Coulomb and Madelung gaps are manifestations of the same phenomenon, resulting from ordering of the positions of point charges, the only difference being the range of correlations.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 515-518
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Behavior of a Short Period Antiferromagnetic Superlattice
    Autorzy:
    Wilamowski, Ż.
    Jantsch, W.
    Faschinger, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931944.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Fr
    75.30.Et
    71.35.+z
    Opis:
    We present a study of short period MnTe/CdTe superlattices by magnetic resonance. The usually antiferromagnetic structure exhibits critical line broadening above the Néel temperature typical of antiferromagnetic ordering, but also some ferromagnetic properties at lower temperature. We suggest that the observed ferromagnetic-like moment originates from coupling of the moments of the recently proposed strong magnetic polarons.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 185-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diluted Magnetic Semimetals - Beyond Heisenberg Coupling
    Autorzy:
    Wilamowski, Z.
    Story, T.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931949.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.30.Hx
    76.20.+q
    Opis:
    We analyse effects which cannot be explained assuming the isotropic Heisenberg form of sp-d or of the indirect d-sp-d (RKKY) coupling. Resonance line broadening, a line shift and an enhancement of the magnetic anisotropy in diluted magnetic semimetals are discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 189-192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential Fluctuations in HgSe:Fe,Ga - a Numerical Study
    Autorzy:
    Sobkowicz, P.
    Wilamowski, Z.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861521.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    Opis:
    We study spatial correlation of donor charges in HgSe:Fe,Ga using a few simple quantities (mean electrostatic energy of various donor sites, fluctuations of the electrostatic potential). The study uses Monte Carlo simulation techniques. We are able to indicate general trends in the behavior of the correlation when proportion of correlating (Fe^{3+}) and noncorrelating (Ga) charged centers in the sample is changed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 645-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoconductivity in GaAlAs:Si Proves Negative U of DX Centers
    Autorzy:
    Wilamowski, Z.
    Jantsch, W.
    Ostermayer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1888154.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    71.55.-i
    Opis:
    The analysis of the temperature dependence of the photoconductivity, amplitude in doped GaAlAs, provides a simple and convincing proof of the negative sign of the Hubbard correlation energy U, strictly speaking of the two-electron nature of the thermal emission process from DX centers. The proof is based on a comparison of the emission activation energy measured per emission event (DLTS) with that measured per electron.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 283-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Resonance Absorption in a 2D Electron Gas
    Autorzy:
    Ungier, W.
    Jantsch, W.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047694.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.75.-d
    73.63.Hs
    75.75.+a
    76.30.-v
    Opis:
    We analyze the power absorption at electron spin resonance excited by the Bychkov-Rashba spin-orbit field in a 2D electron gas. We show that, as long as the absorbed power is dissipated by the usual spin lattice relaxation mechanisms, the resonance line shape is expected to be of pure absorption type, i.e., it can be described by the imaginary part of the dynamic magnetic susceptibility. Therefore, the Dysonian line shape observed in ESR of 2D electron gas cannot result from this type of the resonance signal.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 345-350
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Small Antiferromagnetic Clusters
    Autorzy:
    Buczko, R.
    Wilamowski, Z.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1950740.pdf
    Data publikacji:
    1996-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.50.Rr
    Opis:
    The analysis of the quantum mechanical model of mesoscopic size antiferromagnets shows that small antiferromagnets are characterized by a stronger exchange coupling and by an oscillating character of spins polarizations. Experimental evidence of the quantum character is discussed. We interpret the interlayer coupling in antiferromagnet superlattices and a puzzling resonance observed in nano-size antiferromagnet grains.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 4; 747-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Simulations of Spatial Correlations of Charged Centers in δ-Doped Layers
    Autorzy:
    Sobkowicz, P.
    Wilamowski, Z.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921559.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    73.20.Dx
    71.45.Gm
    Opis:
    Results of Monte Carlo simulations of a 2D system of charged donors are presented. They enable to study the effects related to a spatial correlation of donor charges located on a random donor matrix. A qualitative difference between DX$\text{}^{+}$ and DX¯ models is observed. In the first case, strong temperature dependence of the correlations and a "freezing-like" behaviour is found. The origin of the freezing is traced to the random distribution of donor sites by comparing the system with a liquid-like model where the charges may assume arbitrary positions within a plane. In the second case only nearest-neighbour correlations are observed. The simulations have direct application in analysis of the behaviour of the DX centers in the GaAs planarly doped with Si.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 645-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms of Nonuniform Line Broadening
    Autorzy:
    Wilamowski, Ż.
    Przybylińska, H.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931943.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.20.+q
    76.30.-v
    Opis:
    When the spin relaxation time of paramagnetic impurities at different magnetic sites differs by orders of magnitude then instead of resonance line broadening, rather a decay of the line amplitude is expected. In particular, the sp-d coupling of magnetic impurities to shallow impurities leads to a nonuniform distribution of the longitudinal relaxation rates of local spins.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 181-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Phenomena in Small Antiferromagnets
    Autorzy:
    Wilamowski, Z.
    Buczko, R.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964697.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.50.-y
    Opis:
    We show that the most characteristic properties of mesoscopic antiferromagnets can be explained in terms of the response on a spatially inhomogeneous perturbation. This concept allows to explain the dynamic properties (quantum resonance, coherence and tunnelling rates) as well as static perturbations which, for increasing size of an antiferromagnet, leads to a transition from the quantum mechanical oscillating system to a classical antiferromagnet with well defined Néel vectors.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 379-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Comb-Like" Polarons and Bipolarons in High-T$\text{}_{c}$ Materials
    Autorzy:
    Hankiewicz, E. M.
    Buczko, R.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012878.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.20.-z
    75.10.-b
    74.20.Mn
    Opis:
    Diagonalization of Hamiltonian composed from d-d exchange interactions between localized d spins of antiferromagnetic cluster and p-d interaction with the spin of carriers indicates a possibility of formation of pure magnetic polarons. The most energetically favorable solution occurs when the carrier density in CuO$\text{}_{2}$ planes is distributed on every second spin. These "comb-like" polarons have a tendency to bind into pairs (bipolarons) "glued" by the antiferromagnetic medium.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 185-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Localized Spin Relaxation Due To Coupling To Effective Mass States
    Autorzy:
    Wilamowski, Z.
    Dmochowski, J. E.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968446.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.50.-y
    Opis:
    The EPR of residual Mn in CdF$\text{}_{2}$ doped with Y, In and Ga is investigated. Although these donors are barely seen in EPR, they manifest themselves by a new effect: a drastic resonant reduction in the longitudinal relaxation rate of Mn which occurs only if the Zeeman splitting of the two subsystems coincide. In this situation, the saturation of those of the six Mn hyperfine lines is weakened which coincide with the shallow donor resonance.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1055-1058
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oscillating Antiferromagnetism of Ultrathin EuTe Layers
    Autorzy:
    Wilamowski, Z.
    Springholz, G.
    Svrcek, V.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968444.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.50.Ee
    76.50.+g
    Opis:
    We study magnetic resonance on EuTe/PbTe superlattices. Analysis of the magnetic dipole anisotropy in the superlattices and of the EPR amplitude of isolated Eu ions in the PbTe wells shows that the diffusion at interfaces is very small. The real thickness of EuTe can be evaluated with an accuracy better than one monolayer. Since for EuTe layers thicker than 2 monolayers there is no difference in the character of the antiferromagnetic resonance observed for even and odd numbers of monolayers, we conclude that there is no static magnetization of the antiferromagnetic sublattices. Nevertheless, long range antiferromagnetic order is clearly evident.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 1051-1054
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultra-Fast Spin Dynamics in Diluted Magnetic Semiconductors
    Autorzy:
    Wilamowski, Z.
    Buczko, R.
    Karczewski, G.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952363.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.50.-y
    Opis:
    In nano-size antiferromagnetic systems a spatially inhomogeneous field leads to the formation of a staggered magnetization. Thereby the total magnetic moment does not change but the formation of a net magnetic moment at the border of the cluster leads to an energy gain. This type of magnetism is characterised by an ultra-fast dynamics. We suggest it is also responsible for the formation of the exciton magnetic polaron.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 969-972
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of Magnetic Interactions in HgFeSe
    Autorzy:
    Wilamowski, Z.
    Przybylińska, H.
    Joss, W.
    Guillot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921599.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    75.20.Hr
    Opis:
    Magnetic properties (susceptibility, high-field torque and magnetization) of cubic HgFeSe are analyzed. Van Vleck magnetism of Fe$\text{}^{2+}$ is well evidenced. The energy splitting of the Fe levels in HgSe is shown to differ considerably from that in other II-VI compounds.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 689-692
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Limitations in the Tunability of the Spin Resonance of 2D Electrons in Si by an Electric Current
    Autorzy:
    Wilamowski, Z.
    Malissa, H.
    Glazov, M.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047703.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.75.-d
    73.63.Hs
    75.75.+a
    76.30.-v
    Opis:
    We analyse the recently observed effect of an in-plane electric current through a Si quantum well on the conduction electron spin resonance. We find that the ratio of resonance shift and current density is independent of temperature and dissipation processes, but the channel current is reduced due to a parallel electric channel in heavily modulation doped samples. The inhomogeneous current distribution results in some broadening of the ESR line width. In high mobility Si/SiGe layers the current induced increase in the electron temperature is considerably larger than the increase in the lattice temperature. The signal amplitude scales with the square of electron mobility.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 375-379
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consequences of Spatial Fluctuation of Coulomb Potential in AlGaAs with DX Centers
    Autorzy:
    Wilamowski, Z.
    Kossut, J.
    Jantsch, W.
    Ostermayer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890983.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Dp
    71.45.Jp
    72.80.Ey
    Opis:
    Electric charges on randomly distributed impurities in semiconductors produce a spatially fluctuating potential. When the impurities are partially filled, their occupancy is not random but there appears a spatial correlation of the impurity charges appearing due to the inter-impurity Coulomb interactions. We show that when these interactions are taken into account then (i) the activation energy of the electron concentration, (ii) thermal emission kinetics, (iii) capture kinetics, (iv) persistent photoconductivity kinetics and (v) the electron mobility (in a steady state as well as during transients) in GaAlAs:Si can be explained in a consistent way. The energy diagram con cerning the DX center levels with respect to minima of the conduction band as well as the capture and emission barriers (including the effect of the alloy splitting) is constructed within an approach making use of the notion of the impurity self-screening.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 385-388
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial Correlation of Impurity Charges Induced by Coulomb Interactions - Application to DX Centers in GaAs
    Autorzy:
    Kossut, J.
    Wilamowski, Z.
    Dietl, T.
    Świątek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877485.pdf
    Data publikacji:
    1991-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ey
    72.20.Dp
    71.55.Eq
    Opis:
    The electron mobility enhancement observed in heavily doped GaAs under hydrostatic pressure is interpreted in terms of spatial correlation between the donor charges within partially occupied system of impurities induced by strong inter-donor Coulomb interaction. A simple analytic theory is given for both DX$\text{}^{0}$ and DX$\text{}^{-}$ models of the impurity state. The mobility is shown to increase together with pressure in both models. Estimates of the energy of the DX level are strongly perturbed by the inter-donor Coulomb interactions.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 1; 49-58
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrically Detected Magnetic Resonance
    Autorzy:
    Fedorych, O. M.
    Wilamowski, Z.
    Jantsch, W.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038127.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Pk
    72.25.Rb
    73.21.Fg
    Opis:
    We compare the results of electrically detected magnetic resonance in a 2D electron gas in Si/SiGe quantum wells with transport and magnetic resonance measurements on ferromagnetic Ga$\text{}_{1-x}$Mn$\text{}_{x}$As. The results lead us to the conclusion that observation of electrically detected magnetic resonance is possible only in the case of a slow spin relaxation, where the microwave resonant absorption leads to a noticeable change of spin magnetization.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 591-598
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Paramagnetic Resonance of Cr in PbTe
    Autorzy:
    Story, T.
    Wilamowski, Z.
    Grodzicka, E.
    Witkowska, B.
    Dobrowolski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929751.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    72.20.My
    Opis:
    We present the results of the low temperature electron paramagnetic resonance (EPR) and transport investigations of the crystals of Pb$\text{}_{1-x}$Cr$\text{}_{x}$Te (x ≤ 0.01). The samples with chromium concentrations x ≥ 0.0015 are all n-type. For these samples we observe the single EPR line with the g-factor decreasing from g = 1.97 till g = 1.93 with increasing carrier concentration. This resonance can be attributed to electrically and magnetically active Cr$\text{}^{3+}$ ions. The crystals with Cr concentration x ≤ 0.0015 may be both n- and p-type. The EPR spectrum of these samples consists of two lines: the one discussed above and the other one with g = 1.99 observed only for samples with electron concentration n ≤ 10$\text{}^{18}$ cm$\text{}^{-3}$.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 773-775
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Scattering and the Band Structure of Mixed Crystals Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se
    Autorzy:
    Skierbiszewski, C.
    Wilamowski, Z.
    Suski, T.
    Kossut, J.
    Witkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1923803.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.Fk
    72.20.Fr
    72.80.Jc
    Opis:
    In this paper the dependence of the band structure and the electron scattering mechanisms on the molar fraction x are studied in Hg$\text{}_{1-x}$Fe$\text{}_{x}$Se. The crossover from the zero-gap band to the open band-gap configuration at x ≈ 0.08 is predicted. We explain the drop of the electron mobility for x > 0.002 by the alloy scattering mechanism.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 809-812
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic, Ferrimagnetic and Spin-wave Resonances in GaMnAs Layers
    Autorzy:
    Fedorych, O.
    Byszewski, M.
    Wilamowski, Z.
    Potemski, M.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035590.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    76.30.Fc
    75.50.Pp
    75.30.Gw
    Opis:
    Molecular beam epitaxy grown Ga$\text{}_{1-x}$Mn$\text{}_{x}$As layers were investigated by means of magnetic resonances. With an increase in Mn concentration, x, the spectrum changes from the (i) paramagnetic one, with resolved fine and hyperfine structures, typical of S=5/2 spin of substitutional Mn$\text{}^{2+}$ ions, for very diluted alloy, via (ii) paramagnetic spectrum, where the fine and hyperfine structures are averaged by a long range Mn$\text{}^{2+}$-Mn$\text{}^{2+}$ exchange coupling, (iii) single, isotropic line of ferromagnetic resonance. Insulator to metal transition is accompanied with occurrence of (iv) a very complex spectrum of the ferrimagnetic resonance, accompanied with the well-resolved spin wave resonance. Reentrance to insulator phase for the most condensed alloys is accompanied with the reentrance to (v) ferromagnetic phase. The data confirm that the effective mass holes transfer the exchange interaction between localized Mn$\text{}^{2+}$ spins.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 617-625
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Semiconductor-Antiferromagnet Superlattices
    Autorzy:
    Wilamowski, Z.
    Buczko, R.
    Jantsch, W.
    Ludwig, M.
    Springholz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952426.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    75.50.Pp
    76.50.+g
    Opis:
    Magnetic resonance investigations of ultra-thin antiferromagnetic EuTe layers show a specific behaviour in the quasi-2D antiferromagnetic ordering: (i) an anisotropy of the critical broadening, (ii) a substantial increase in the Néel temperature and (iii) an anisotropic shift of the resonance frequency which diverges at the Néel point. The results show that exchange coupling is stronger in quasi-2D than in 3D antiferromagnetic samples and that correlation of spin chains aligned in the perpendicular direction occurs already well above the Néel point.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 973-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metastability of Localized Neutral Donor State In GaAs
    Autorzy:
    Skierbiszewski, C.
    Jantsch, W.
    Lübke, K.
    Wilamowski, Z.
    Suski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933994.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Fr
    71.55.-i
    Opis:
    Investigations of the photoconductivity of GaAs:Ge under hydrostatic pressure show, in addition to the well known persistent photoconductivity due to the DX state, another giant photoconductivity caused by a neutral localised "A₁" state of the donor. We find that the top of the barrier for the electron recapture to the Α₁ state is pinned to the conduction band edge and the capture cross-section σ(T → ∞) is surprisingly small.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 905-908
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    35×4 Substates of DX Centers in AlGaAs:Si
    Autorzy:
    Ostermayer, G.
    Brunthaler, G.
    Stöger, G.
    Jantsch, W.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929749.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.80.Ey
    Opis:
    The measured temperature dependent free carrier concentration in AlGaAs:Si samples is compared with a model calculation where we take the full 35 × 4 alloy statistics of the DX center and potential fluctuations into account. Within this statistics we are able to describe the electron capture by a single barrier E$\text{}_{B}$ for all Al-configurations. We compare the alloy statistics with the simple 4 × 1 statistics.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 765-768
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Dipole and Current Induced Spin Resonances of Shallow Donor in ZnO
    Autorzy:
    Michaluk, E.
    Błoniarz, J.
    Pabich, M.
    Wilamowski, Z.
    Mycielski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046940.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.-v
    71.70.Ej
    Opis:
    In this paper we present our observation of electric dipole spin resonance and current induced spin resonance in ZnO bulk crystals, both effects result from spin-orbit coupling. Electric dipole spin resonance originates from admixture of spin state due to spin-orbit interaction which leads to probability of spin-flip caused by electric component of microwave field. In current induced spin resonance phenomenon the electric component of microwave field induces electron motion leading to mean ac spin-orbit field that acts on electron spin. Spin-orbit interaction can be described in terms of the Rashba field, an effective magnetic field that induce spin resonance. In contrast to magnetic and electric dipole spin resonances the current induced resonance is characterized by dispersive-like line shape.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 263-270
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alloy Splitting of the Te-DX States in Al$\text{}_{x}$Ga$\text{}_{1-x}$As
    Autorzy:
    Ostermayer, G.
    Jantsch, W.
    Dobosz, D.
    Żytkiewicz, Z. R.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929750.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.80.Ey
    Opis:
    We report investigations of the Hall effect and conductivity of Te doped Al$\text{}_{x}$Ga$\text{}_{1-x}$As (x = 0.3). After illumination at low temperature, the conductivity decreases in two steps on warming. These steps are explained in terms of the two sets of energy levels associated with two types of Te-DX centers depending on the neighboring host cation (Ga or Al) which undergoes the 1attice relaxation. The observed persistent increase in mobility is also explained in terms of the two different capture barriers.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 769-772
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Resonance Studies of the Origin of Ferromagnetism in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As
    Autorzy:
    Fedorych, O. M.
    Wilamowski, Z.
    Potemski, M.
    Byszewski, M.
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036029.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    76.30.Fc
    75.50.Pp
    75.30.Gw
    Opis:
    Different types of magnetic resonance observed in Ga$\text{}_{1-x}$Mn$\text{}_{x}$As reflect three different magnetic phases: para-, ferro-, and ferrimagnetic. Ferromagnet is characterized by single isotropic resonance line. A complex spectrum in ferrimagnet can be described by g factor equal to 1.44 and a sum of an axial and cubic anisotropy field. The axial field is by an order of magnitude greater than the cubic one. The complex structure of ferrimagnetic resonance is attributed to spin-wave resonance. Quantitative analysis of the dispersion of spin wave shows that the range of exchange coupling is very long, of the order of 25 nm, while spin-wave stiffness and the total exchange field are very small. The exchange field as evaluated from spin wave is by two orders of magnitude smaller than the Zener field corresponding to the critical temperature.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 607-612
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure Study of Charged Donor Ordering in HgSe Doped with Iron and Gallium
    Autorzy:
    Skierbiszewski, C.
    Suski, T.
    Kossut, J.
    Wilamowski, Z.
    Dobrowolski, W.
    Witkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891020.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.Fk
    72.20.Fr
    72.80.Jc
    Opis:
    Transport experiments (Hall effect and conductivity) under hydrostatic pressure up to 1 GPa at liquid helium temperatures on HgSe: Fe, Ga (N$\text{}_{Fe}$ = 2 x 10$\text{}^{19}$ cm$\text{}^{-3}$; 0 ≤ N$\text{}_{Ga}$ ≤ 10$\text{}^{19}$ cm$\text{}^{-3}$) were performed. The results show that the gallium co-doping of HgSe:Fe decreases the degree of spatial correlations between charged impurities. Under the hydrostatic pressure, used as a tool for changing the ratio of the charged to neutral impurities, this effect is even more pronounced. A qualitative agreement between the calculation within the short-range correlation model and our experimental data is achieved.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 401-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PbSe:Cr - New Resonant Donor System
    Autorzy:
    Story, T.
    Wilamowski, Ż.
    Grodzicka, E.
    Dobrowolski, W.
    Witkowska, B.
    Voiron, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932086.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pρ
    72.20.My
    Opis:
    Hall effect, conductivity, electron paramagnetic resonance and magnetization of Pb$\text{}_{1-x}$Cr$\text{}_{x}$Se (x ≤ 0.01) crystals were measured as a function of Cr content and electron concentration. The experimental results suggest that Cr in PbSe creates a resonant donor state with the energy of about 125 meV above the bottom of the conduction band.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 229-232
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bychkov-Rashba Effect and g-Factor Tuning in Modulation Doped SiGe Quantum Wells
    Autorzy:
    Malissa, H.
    Jantsch, W.
    Mühlberger, M.
    Schäffler, F.
    Wilamowski, Z.
    Draxler, M.
    Bauer, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038126.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Fg
    85.75.-d
    Opis:
    We investigate the spin resonance of electrons in one-sided modulation doped Si$\text{}_{1-x}$Ge$\text{}_{x}$ (x=0-10%)) quantum wells defined by Si$\text{}_{0.75}$Ge$\text{}_{0.25}$ barriers. In such structures, the Bychkov-Rashba effect induces an effective magnetic field in the quantum well layer which causes anisotropy of both the g-factor and the spin coherence time. Evaluation of the Rashba coefficient as a function of x yields a monotonic increase. For x=5% the shift in the resonance field exceeds the ESR linewidth already, demonstrating the possibility to use this effect for g-factor tuning to select individual spins in an ensemble.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 585-590
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave Techniques Investigations of ZnCoO Films Grown by Atomic Layer Deposition
    Autorzy:
    Łukasiewicz, M.
    Cabaj, A.
    Godlewski, M.
    Guziewicz, E.
    Wittlin, A.
    Jaworski, M.
    Wołoś, A.
    Wilamowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492931.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Electrical and magnetic properties of ZnCoO thin films grown on silicon substrates by atomic layer deposition method are investigated. The films were grown using reactive organic precursors of zinc and cobalt. The use of these precursors allowed us the significant reduction of a growth temperature to 200°C and below, which proved to be very important for the growth of uniform films of ZnCoO. We have measured the microwave AC conductivity and EPR for two types of ZnCoO samples, with different Co fractions.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 911-913
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mn Impurity in GaN Studied by Electron Paramagnetic Resonance
    Autorzy:
    Wołoś, A.
    Palczewska, M.
    Wilamowski, Z.
    Kamińska, M.
    Twardowski, A.
    Boćkowski, M.
    Grzegory, I.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036027.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    71.55.Eq
    71.70.Gm
    Opis:
    We present the results of electron paramagnetic resonance investigations of GaN bulk crystals doped with Mn. The EPR experiment shows the Mn$\text{}^{2+}$ resonance in all the investigated n-type crystals, while in highly resistive samples extra doped with Mg acceptor the Mn$\text{}^{2+}$ resonance decreases. This is a consequence of the location of Mn acceptor level in GaN band gap. The analysis of the spin relaxation times reveals the Korringa scattering as the dominating spin relaxation mechanism in n-type GaN:Mn crystals. The effective exchange constant determined from spin relaxation rate temperature dependence is of the order of 14 meV.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 595-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PVT-Grown Single Crystals of Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te (x ≤ 0.25) and ZnTe as Substrates for Epitaxy
    Autorzy:
    Mycielski, A.
    Szadkowski, A.
    Łusakowska, E.
    Kowalczyk, L.
    Domagała, J.
    Bąk-Misiuk, J.
    Wilamowski, Z.
    Witkowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991957.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.10.Bk
    Opis:
    The process of growth of single crystals of Cd$\text{}_{1-x}$Zn$\text{}_{x}$Te (x ≤ 0.25) and ZnTe by physical vapour transport has been optimized and the twin-free single crystals with a very good crystal structure and low density of dislocations are grown as substrates for MBE and other techniques of epitaxy. Characterization of the crystals is described.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 441-445
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Electron DX State in CdTe:In
    Autorzy:
    Skierbiszewski, C.
    Wiśniewski, P.
    Litwin-Staszewska, E.
    Suski, T.
    Wilamowski, Z.
    Zakrzewski, A. K.
    Karczewski, G.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952096.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    73.61.Ga
    Opis:
    In this paper we investigate electron emission/capture from/to the DX state of indium in CdTe by means of high pressure freeze-out cycle and steady-state photo-conductivity experiments. The results indicate that the DX state is occupied by two electrons. A comparison with deep level transient spectroscopy data shows that two-electron emission occurs at low temperatures, while one-electron emission takes place at high temperatures.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 927-930
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Transfer in Multiple Quantum Well Structures of CdTe/CdMnTe Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Surma, M.
    Wilamowski, Z.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Holtz, P. O.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968091.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    Opis:
    The direct evidence for the efficient transfer of excitons from 4 nm and 6 nm to 10 nm wide CdTe quantum wells is presented based on the results of photoluminescence and photoluminescence excitation investigation. Efficient transfer is observed for quantum wells separated by thick (50 nm) CdMnTe barriers containing 10% or 30% Mn fraction. A new mechanism of the transfer is proposed, which involves long range dynamic magnetic interactions between free/bound excitons and Mn ions in the CdMnTe barrier regions of the structure.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 761-764
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic, Structural, and Optical Properties of Low Temperature ZnMnO Grown by Atomic Layer Epitaxy
    Autorzy:
    Wójcik, A.
    Kiecana, M.
    Kopalko, K.
    Godlewski, M.
    Guziewicz, E.
    Yatsunenko, S.
    Łusakowska, E.
    Minikayev, R.
    Paszkowicz, W.
    Świątek, K.
    Wilamowski, Z.
    Sawicki, M.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044552.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.55.Ln
    68.55.Nq
    78.66.Hf
    81.15.Kk
    Opis:
    Magnetic, structural, and optical properties of ZnMnO films grown with atomic layer epitaxy are discussed. Atomic layer epitaxy films were grown at low temperature using organic zinc and manganese precursors. From magnetometry and electron spin resonance investigations we conclude that lowering of a growth temperature significantly limits formation of Mn precipitates and inclusions of different foreign phases of manganese oxides to ZnMnO host.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 915-921
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do We Understand Magnetic Properties of ZnMnO?
    Autorzy:
    Godlewski, M.
    Wójcik, A.
    Kopalko, K.
    Ivanov, V. Yu.
    Wilamowski, Z.
    Jakieła, R.
    Guziewicz, E.
    Szczepanik, A.
    Dłużewski, P.
    Chikoidze, E.
    Barjon, J.
    Dumont, Y.
    Putkonen, M.
    Niinistö, L.
    Tang, Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/2047644.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    75.75.+a
    78.30.Fs
    78.60.Hk
    Opis:
    Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 261-267
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Podstawowe zasady metodyki oceny rzeczywistych strat ekonomicznych wywołanych przez pasożytnicze choroby zwierząt użytkowych. Konferencja okrągłego stołu "Metody oceny strat ekonomicznych powodowanych przez pasożyty zwierząt użytkowych", Warszawa, 22 III 1974
    The essential methods to estimate the real losses caused by parasite infections in domestic animals. Round Table Conference: " Methods of evaluating of economic losses caused by parasites of domestic animal", Warsaw, 22 III 1974
    Osnovnye principy metodiki ocenki dejjstvitel'nykh ehkonomicheskikh ubylejj vyzvannykh parazitnymi zabolevanijami potrebitel'nykh zhivotnykh. Konferencija kruglovo stola: "Metody ocenki ehkonomicheskikh ubylejj vyzvannykh parazitami potrebitel'nykh zhivotnykh", Varshava, 22 III 1974
    Autorzy:
    Tarczyński, S.
    Wilamowski, B.
    Wrześniowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2170655.pdf
    Data publikacji:
    1975
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Źródło:
    Wiadomości Parazytologiczne; 1975, 21, 2; 297-321
    0043-5163
    Pojawia się w:
    Wiadomości Parazytologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Średni czas pobytu wód podziemnych w zlewniach Wisły i Narwi na podstawie oznaczeń trytu
    Mean residence time of groundwater in the Vistula and Narew basins on the basis of tritium measurements
    Autorzy:
    Nowicki, Z.
    Leśniak, P. M.
    Wilamowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075521.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tryt
    średni czas przebywania
    dorzecze Wisły
    dorzecze Narwi
    dorzecze Dunaju
    tritium
    mean residence time
    Vistula river basin
    Narew River Basin
    Danube River Basin
    Opis:
    An issue of mean residence time (MRT) evaluation, i.e. the period of time from rainfall until drainage of groundwater by rivers (Danube River Basin, Vistula River Basin and Narew River Basin), is discussed Asimple method of evaluating the groundwater MRT for the Danube River Basin based on tritium data is introduced. It has been confirmed that the historical tritium level in the rivers, being higher than in precipitation, has its end and is reversed, opening a new pathway in understanding the surface-groundwater interaction and specifically in evaluating MRT of groundwater. The authors have defined a separate notification for mean residence time of the whole water in the basin (τ) and mean residence time for groundwater in the basin (τwp). Based on the tritium study the obtained τ values are 6.5 and 5.7 years for the Vistula River Basin (VRB) and the Narew River Basin (NRB), respectively. In turn, the obtained τwp values are 8.0 and 6.0 years, respectively. NRB is a lowland plain and a morphologically, geologically and hydrogeologically uniform basin. The obtained τ wp of groundwater is thus representative for the whole basin. Instead inmorphologically non uniform VRB basin groundwater τwp is a generalized value,i.e.averaged over contributed parts of the basin.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 8; 545--551
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zawartość trytu i skład izotopowy tlenu w płytkich wodach podziemnych w punktach badawczych krajowej sieci monitoringu
    Tritium content and oxygen isotopic composition in shallow groundwater in observation points of the national monitoring network
    Autorzy:
    Nowicki, Z.
    Leśniak, P.M.
    Wilamowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075445.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tryt
    stabilne izotopy
    czas przebywania
    płytkie wody podziemne
    tritium
    stable isotopes
    residence time
    shallow groundwater
    Opis:
    The points of the national network of groundwater monitoring comprise a stable benchmarks in quality and quantity monitoring. The obtained data (tritium and δ18O) are important for understanding the groundwater cycling and are indirect indicators of aquifer vulnerability to anthropogenic pollution. The goal of this paper is to present the relation of the tritium content and delta value of stable isotopes of oxygen against the groundwater sampling depth in 2004–2012. It is demonstrated that the remains of “nuclear” tritium concentration is still present in groundwater as a tritium peak at depths around 30 m. Determination of dynamics of recharge in groundwater bodies, based on national network observation points is associated to the estimation of the groundwater residence time in aquifers and remains one the vital problem of hydrogeology.
    Źródło:
    Przegląd Geologiczny; 2015, 63, 10/2; 976--980
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and fungistatic activity of aryl-substituted naphthalene- and indene-2-carbonitriles
    Autorzy:
    Kozik, B
    Burgieł, Z. J.
    Sepioł, J. J.
    Wilamowski, J.
    Łuczyński, M. K.
    Góra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/363192.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    grzyby fitopatogenne
    WWA
    aktywność fungistatyczna
    ochrona roślin
    phytopathogenic fungi
    PAHs
    fungistatic activity
    plant protection
    Opis:
    4-Aryl-substituted 1-aminonaphthalene-2-carbonitriles and 3-phenyl-1-oxo-1H-indene-2-carbonitriles were prepared in a two--step synthesis from appropriate carbonyl compounds and were evaluated in vitro for growth-inhibiting activity against some phytopathogenic fungi: Fusarium culmorum, Penicillium expansum, Botrytis cinerea and Alternaria species. The results were compared with the activity of a commercial fungicide - captan. The highest fungistatic activity was revealed by 1-amino-4-phenylnaphthalene-2-carbonitrile. An efficient synthesis of 1-amino-4-arylnaphthalene-2-carbonitriles involves condensation of diarylacetaldehydes or 1,1-diarylacetones with malonodinitrile and cyclization of the obtained aryl-ylidenemalonodinitriles in concentrated sulfuric acid. The benzannulation reaction is accompanied by a quasi-aromatic rearrangement. The indenone derivatives were synthesized in the same manner from substituted benzophenones. As the formation of five-membered ring during the cyclization of diarylmethylidenemalonodinitriles was less effective, the rearrangement was not observed.
    Źródło:
    Environmental Biotechnology; 2006, 2, 1; 20-25
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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