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    Wyświetlanie 1-8 z 8
    Tytuł:
    Defect Levels in Gallium Arsenide after Irradiation with Light Ions
    Autorzy:
    Schmidt, T.
    Palmetshofer, L.
    Lübke, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877086.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    Opis:
    Deep level centers in GaAs implanted with light ions (H$\text{}^{+}$, He$\text{}^{+}$) were studied by means of deep level transient spectroscopy, double correlation deep level transient spectroscopy and capacity voltage carrier profiling directly after the implantation process and after annealing at various temperatures. Five different electron traps with energy positions between 0.13-0.75 eV are detected. From the evaluated defect production and carrier trapping yields and their annealing behavior we conclude that each of these traps efficiently contributes to the trapping of free carriers. The EL2 defect is created in too low concentrations in order to significantly account for the removal of free carriers.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 543-546
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frustrated Magnetism in Vanadium Oxides
    Autorzy:
    Thalmeier, P.
    Schmidt, B.
    Yushankhai, V.
    Takimoto, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810285.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Jm
    75.10.Lp
    Opis:
    The effect of frustration in various localized and itinerant vanadium oxide compounds is discussed within next nearest neighbors Heisenberg and spin fluctuation models, respectively. In the localized moment case the S=1/2 $J_1-J_2$-model on a square lattice exhibits a rich phase diagram with magnetic as well as exotic hidden order phases due to the interplay of frustration and quantum fluctuations. Their signatures in the high field magnetization and in magnetocaloric quantities are surveyed. The possible quantum phase transitions are discussed and applied to layered vanadium oxides of the type $AA'VO(PO_4)_2$ where A, A' = Pb, Zn, Sr, Ba, Cd. In itinerant electron systems magnetic frustration may emerge as a result of electron correlations on a geometrically frustrated lattice. This mechanism causes enhanced spin fluctuations in a large region of momentum space and therefore can lead to a heavy fermion state at low temperatures as in the 3d spinel compound $LiV_2O_4$. The evidence from neutron scattering and NMR experiments is discussed within self-consistent renormalization theory based on local density approximation band structure calculations.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 53-58
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Symmetry of the Sulfur Pair-Related Defect in Silicon
    Autorzy:
    Bennebroek, M. T.
    Zakrzewski, A.
    Frens, A. M.
    Schmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929739.pdf
    Data publikacji:
    1993-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Lh
    71.55.Ht
    Opis:
    A sulfur-related-pair defect in silicon has been studied with optically detected magnetic resonance spectroscopy. Measurement of the angular dependence of the optically detected magnetic resonance signals supplemented by the analysis of the spectrum "quality" yield to the conclusion that the point group symmetry of the defect studied is C$\text{}_{1h}$.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 4; 725-728
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Reversal in Cobalt Nanocolumn Structures Obtained by Glancing Angle Deposition
    Autorzy:
    Buchta, K.
    Schmidt, Ch.
    Trykowski, G.
    Biniak, S.
    Kempiński, M.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428548.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    73.50.-h
    73.61.-r
    Opis:
    An advanced deposition technique known as glancing angle deposition was used to fabricate randomly seeded magnetic cobalt columnar nanostructures. The existence of nanocolumns was confirmed by the cross-section scanning electron microscopy. The evolution in the magnetization reversal mechanism as a function of the film thickness was investigated. The coercivity $H_{C}$ and $M_{R}//M_{S}$ ratio (where $M_{R}$ and $M_{S}$ denote the remanent and saturation magnetization, respectively), derived from the magnetic hysteresis loops, are discussed as a function of the angle between the external magnetic field and the surface normal. The direction of the magnetization easy/hard axis and the columns inclination angle were determined on the basis of the angular dependences of the $H_{C}$ and the $M_{R}//M_{S}$. A crossover from the coherent rotation, based on the Stoner-Wohlfarth model, to the curling reversal mode was observed.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1222-1224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Quality Ni-Fe/Cu Multilayer Films with Antiferromagnetic Coupling
    Autorzy:
    Stobiecki, F.
    Dubowik, J.
    Luciński, T.
    Szymański, B.
    Rohrmann, H.
    Röll, K.
    Schmidt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955455.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    76.50.+g
    Opis:
    We report structural and magnetic properties of Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayer films with various buffer layer and sublayer thicknesses of copper d$\text{}_{Cu}$ and Permalloy d$\text{}_{Py}$ deposited by face-to-face sputtering. The following features prove a good quality of our films: a well-layered structure, complete antiferromagnetic coupling with a low coupling strength (2×10$\text{}^{-5}$ J/m$\text{}^{2}$ for d$\text{}_{Cu}$=1 nm and 10$\text{}^{-6}$ J/m$\text{}^{^2}$ for d$\text{}_{Cu}$=2.1 nm) and a low coercive field which make them attractive for possible applications as giant magnetoresistance sensors.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 277-280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnon and Soliton Excitations in the Carrier-Poor, One-Dimensional S=1/2 Antiferromagnet Yb$\text{}_{4}$As$\text{}_{3}$
    Autorzy:
    Steglich, F.
    Köppen, M.
    Gegenwart, P.
    Cichorek, T.
    Wand, B.
    Lang, M.
    Thalmeier, P.
    Schmidt, B.
    Aoki, H.
    Ochiai, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011226.pdf
    Data publikacji:
    2000-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Mb
    65.50.+m
    65.70.+y
    Opis:
    The semimetallic quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Yb$\text{}_{4}$As$\text{}_{3}$ was studied by low-temperature measurements of the specific heat C(T,B), thermal expansion α(T,B), and thermal conductivity ĸ(T,B). At finite magnetic fields (B≤12 T) we observed the following distinct anomalies: (1) the magnon contribution to C(T,0), γ T, with large coefficient γ ≈ 200 mJ/(K$\text{}^{2}$mol), becomes strongly reduced with field, and (2) a broad hump in C(T,B=const) is induced at slightly higher temperatures. (3) The latter corresponds to a pronounced peak in α(T,B=const) as well as (4) to a broad minimum in ĸ(T,B= const)/ĸ(T,0). These anomalies are well described by the classical sine-Gordon solution of a one-dimensional Heisenberg antiferromagnet with a weak easy-plane anisotropy. However, the soliton-rest energy deduced from the experimental results depends on the magnetic field like E$\text{}_{S}$ ~ B$\text{}^{ν}$, with an exponent ν ≈ 0.66, while the classical sine-Gordon model requires ν=1. Thus, our results suggest an alternative description of soliton excitations in an antiferromagnetic S=1/2 Heisenberg chain in terms of the quantum sine-Gordon model, for which an exponent ν=2/3 is appropriate.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 1; 91-100
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Domains Stimulated Magnetostatic Coupling in NiFe/Au/Co/Au Multilayers Investigated by Complementary Methods
    Autorzy:
    Stobiecki, F.
    Urbaniak, M.
    Szymański, B.
    Kuświk, P.
    Schmidt, M.
    Aleksiejew, J.
    Weis, T.
    Engel, D.
    Lengemann, D.
    Ehresmann, A.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810577.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.30.Gw
    75.60.-d
    Opis:
    The magnetic structure of $Ni_{80}Fe_{20}$/Au/Co/Au multilayers characterized by easy-plane and easy-axis perpendicular to the sample plane anisotropies for NiFe and Co, respectively, is strongly modified by magnetostatic coupling resulting from stray fields of stripe domains in the Co layers. Using complementary methods it will be shown that the magnetostatic coupling increases with decreasing Au spacer thickness, with the weakening of the easy plane anisotropy of the NiFe layers and with increasing thickness of the Co layers.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 345-347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines
    Autorzy:
    Prikhna, T.
    Gawalek, W.
    Savchuk, Ya.
    Sergienko, N.
    Moshchil, V.
    Sokolovsky, V.
    Vajda, J.
    Tkach, V.
    Karau, F.
    Weber, H.
    Eisterer, M.
    Joulain, A.
    Rabier, J.
    Chaud, X.
    Wendt, M.
    Dellith, J.
    Danilenko, N.
    Habisreuther, T.
    Dub, S.
    Meerovich, V.
    Litzkendorf, D.
    Nagorny, P.
    Kovalev, L.
    Schmidt, Ch.
    Melnikov, V.
    Shapovalov, A.
    Kozyrev, A.
    Sverdun, V.
    Kosa, J.
    Vlasenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549637.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Sv
    74.81.Bd
    74.70.Ad
    74.78.Na
    74.62.Fj
    74.25.Ld
    74.62.Dh
    74.25.Ha
    Opis:
    Materials of the Y-Ba-Cu-O (melt-textured $YBa_{2}Cu_{3}O_{7-δ}$-based materials or MT-YBCO) and Mg-B-O ($MgB_{2}$-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800°C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of $MgB_{2}$-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 $μm^{-1}$), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of $MgB_{2}$-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-$MgB_{12}$ stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high $T_{c}$ (37 K) and critical current densities in materials with $MgB_{12}$ matrix (with 95% of shielding fraction as calculated from the resistant curve).
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 7-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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