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    Wyświetlanie 1-15 z 15
    Tytuł:
    Effect of Noncollinear Magnetic Order on the Hyperfine Interactions in $Pt_{3}Fe$
    Autorzy:
    Woźniakowski, A.
    Deniszczyk, J.
    Szymański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506637.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    71.20.Lp
    75.50.Bp
    76.80.+y
    Opis:
    The investigations of the hyperfine interactions in $Pt_{3}Fe$ with the noncollinear magnetic order by means of ab initio methods are presented. It is shown that the ground state magnetic order of $Pt_{3}Fe$ is of noncollinear character. Electric field gradient and hyperfine magnetic field at $\text{}^{57}Fe$ nucleus were calculated and their dependence on the strength of Coulomb correlation interaction is discussed. The calculated values of electric field gradient correspond with the experimental data and the best agreement was found when the enhanced Coulomb correlation interaction for 3d-states of Fe was considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p semicore electron contributions to electric field gradient are separated out and discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 65-67
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Maximum Entropy Method in Mössbauer Spectroscopy - a Problem of Magnetic Texture
    Autorzy:
    Satuła, D.
    Szymański, K.
    Dobrzyński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506656.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    02.60.-x
    Opis:
    A reconstruction of the three dimensional distribution of the hyperfine magnetic field, isomer shift and texture parameter z from the Mössbauer spectra by the maximum entropy method is presented. The method was tested on the simulated spectrum consisting of two Gaussian hyperfine field distributions with different values of the texture parameters. It is shown that proper prior has to be chosen in order to arrive at the physically meaningful results.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 78-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Magnetic Properties of $GaFeO_3$ by Neutron Diffraction and Mössbauer Spectroscopy
    Autorzy:
    Rećko, K.
    Szymański, K.
    Dobrzyński, L.
    Waliszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419611.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.fm
    61.05.Qr
    75.50.Gg
    75.50.Ee
    75.85.+t
    Opis:
    The multiferroic $GaFeO_3$ synthesized by a sol-gel method and conventional solid state reaction show remarkably different magnetic transition temperatures. Both samples have orthorhombic crystal structure $Pc2_1n$. Results of a new analysis of neutron diffraction and Mössbauer data are presented. Full agreement between parameters was achieved using the Mössbauer data as the constraints in the refinement of neutron diffraction data at low and at high temperature. Magnetic moments are reported.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 396-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the Exchange Integrals Map of ScFe₄Al₈ Magnetic Structure
    Autorzy:
    Rećko, K.
    Dobrzyński, L.
    Waliszewski, J.
    Szymański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386376.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.fm
    71.20.Be
    71.70.Gm
    75.10.Dg
    75.30.Et
    Opis:
    The influence of the dipolar as well as crystal field interaction as the main reasons of the noncollinearity and incommensurability of the 3d-3d-3p alloy belonging to ThMn₁₂ family is investigated. Available data on the single crystal neutron scattering experiments for ScFe₄Al₈ compound are discussed. The values and directions of the spin ordering found by magnetic diffraction are compared to that one derived from ground state configurations obtained by a simulated annealing algorithm.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 424-426
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Moments Arrangement in Fe Layers Deposited from Acetone Based Electrolyte
    Autorzy:
    Olszewski, W.
    Szymański, K.
    Satuła, D.
    Biernacka, M.
    Talik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811609.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    33.45.+x
    76.80.+y
    75.30.Gw
    75.30.Cr
    Opis:
    The acetone based electrolyte was used for electrodeposition of iron layers on the copper substrate. Two types of surfaces of the deposited layer can be obtained: shiny or black. Magnetic properties of the near-surface regions were studied by the conversion electron Mössbauer spectroscopy. The conversion electron Mössbauer spectra revealed apparent dependence of magnetic moments' arrangement on the deposition time. Those results were compared with the magnetization measurements. Composition of black coating was examined by the X-ray photoelectron spectroscopy measurements.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1631-1640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method
    Autorzy:
    Satuła, D.
    Kalska-Szostko, B.
    Szymański, K.
    Dobrzyński, L.
    Kozubowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811606.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    61.46.Df
    75.75.+a
    Opis:
    The magnetic properties of iron oxide nanoparticles prepared by the chemical decomposition of the iron chlorides with the ratio $Fe^{3+}$/$Fe^{2+}$=2.25 were studied by means of transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy in- and without external magnetic field. The transmission electron microscopy studies show that the nanoparticles have spherical shape with diameter about 13 nm. The transmission electron microscopy and X-ray diffraction patterns are composed of lines that could be indexed within the cubic spinel structure. The room temperature Mössbauer spectrum shows the coexistence of the broad magnetically split part and superparamagnetic doublet. The in-field Mössbauer measurements carried out in the temperature range from room temperature down to 13 K show a gradual increase in the spin canting on the surface of the nanoparticles and decrease in the intensity of the superparamagnetic doublet. The sample was subjected to annealing process performed at elevated temperature in air atmosphere in order to change the microstructure of the nanoparticles and in consequence to change the magnetic properties of the sample. The annealing process leads to the decrease in the value of quadrupole splitting of the superparamagnetic doublets.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1615-1621
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine Interactions of $\text{}^{57}Fe$ in #Pt_3Fe# - Ab Initio and Mössbauer Effect Studies
    Autorzy:
    Deniszczyk, J.
    Satuła, D.
    Waliszewski, J.
    Rećko, K.
    Olszewski, W.
    Parzych, G.
    Szymański, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810456.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Ap
    71.15.Nc
    71.20.-b
    71.20.Be
    71.20.Lp
    75.50.Bb
    76.80.+y
    Opis:
    The Mössbauer effect and ab initio investigations of an electric field gradient at $\text{}^{57}Fe$ nuclei in $Pt_3Fe$ compound are presented. It is shown that nonzero $\text{}^{57}Fe$ electric field gradient exists in the cubic $Pt_3Fe$. Ab initio study of $Pt_3Fe$ in antiferromagnetic state confirms the presence of electric field gradient at $\text{}^{57}Fe$ nuclei. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric field gradient are separated out and discussed in the context of the electronic structure changes upon the antiferromagnetic phase transition.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 197-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Deposition of Nanowires in Porous Alumina
    Autorzy:
    Kalska-Szostko, B.
    Brancewicz, E.
    Mazalski, P.
    Sveklo, J.
    Olszewski, W.
    Szymański, K.
    Sidor, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809497.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.-h
    62.23.Hj
    82.45.Qr
    81.07.-b
    75.75.+a
    Opis:
    Electrochemical deposition is a very efficient method for producing many types of modern materials. The method is not expensive and does not have a limit for sample size. In our work the preparation of Ni, Co and Fe nanowires is presented. The obtained nanowires had different diameter and length which were tunable by template porous material and time of deposition, respectively. The quality of the prepared wires was dependent also on deposition mode. The smallest wires of the diameter around 40 nm were prepared in porous anodic alumina oxide obtained from oxalic acid. The largest ones, around 120 nm, were produced in phosphoric acid. The length could be as large as the thickness of the oxide and reached up to about 1 μm. The morphology of wires was studied by atomic force microscopy and scanning electron microscopy. The magnetic characterization was done with usage of magnetic force microscopy and the Mössbauer spectroscopy. The wires show magnetization along their growth direction.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 542-544
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealing in Multicomponent bcc Alloys
    Autorzy:
    Szymański, K.
    Perzyńska, K.
    Satuła, D.
    Dobrzyński, L.
    Zaleski, P.
    Waliszewski, J.
    Rećko, K.
    Biernacka, M.
    Olszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506614.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    76.80.+y
    61.05.Qr
    61.50.Ks
    81.30.Hd
    Opis:
    Multicomponent single phase alloys were synthesized according to the idea of iron-average atom system. X-ray diffraction shows formation of bcc phase and traces of unidentified phase. Mössbauer spectra indicate presence of two components with different hyperfine magnetic field distributions. The high field component corresponds to the majority ferromagnetic phase. Few per cent of iron builds low field component. The dominant effect of annealing consists in an increase of the low field component.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 62-64
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys
    Autorzy:
    Perzyńska, K.
    Go, A.
    Szymański, K.
    Biernacka, M.
    Hawełek, Ł.
    Kalska-Szostko, B.
    Oleszak, D.
    Rećko, K.
    Waliszewski, J.
    Zaleski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375573.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.23.-k
    71.55.Ak
    72.15.-v
    72.15.Eb
    75.50.Bb
    82.80.Ej
    Opis:
    The electrical and magnetic properties of $Fe_{0.5}A_{0.5}$ alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 999-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Properties of Ni/Ti Multilayers
    Autorzy:
    Szymański, B.
    Stobiecki, F.
    Otto, T.
    Röll, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953189.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.70.-i
    Opis:
    We report a study of structure and magnetic properties of Ni/Ti multilayers with different modulation wavelength, 10 nm ≤ λ ≤ 40 nm, and constant sublayers thickness ratio d$\text{}_{Ni}$/d$\text{}_{Ti}$=1. Specimens were characterized with X-ray diffraction, vibrating sample magnetometer and torque meter in as-deposited state and in successive stages of isothermal annealing at 423 K. Hysteresis curves of as-deposited samples revealed the typical feature of ferromagnetic films with predominant shape anisotropy. During annealing very pronounced changes in the hysteresis loops were observed. An analysis of the loops indicates the occurrence of distinct changes in magnetic anisotropy of Ni sublayers: their effective shape anisotropy is drastically reduced due to a development of the perpendicular anisotropy and/or a modification of the microstructure. The effect can possibly be applied to achieve desirable variation of perpendicular anisotropy in multilayers which consist of Ni sublayers.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 233-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Large Vocabulary Continuous Speech Recognition for Polish
    Autorzy:
    Demenko, G.
    Szymański, M.
    Cecko, R.
    Kuśmierek, E.
    Lange, M.
    Wegner, K.
    Klessa, K.
    Owsianny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490468.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.72.-p
    43.72.+q
    Opis:
    In this study, the results of acoustic modeling used in a large vocabulary continuous speech recognition system are presented. The acoustic models have been developed with the use of a phonetically controlled large corpus of contemporary spoken Polish. Evaluation experiments showed that relatively good speech recognition results may be obtained with adequate training material, taking into account: (a) the presence of lexical stress; (b) speech styles (a variety of segmental and prosodic structures, various degrees of spontaneity of speech (spontaneous vs. read speech), pronunciation variants and dialects); (c) the influence of the sound level and background noises. The present large vocabulary continuous speech recognition evaluation results were obtained with Sclite assessment software. Moreover, the article delivers information about the speech corpus structure and contents and also a brief outline of the design and architecture of the automatic speech recognition system.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-086-A-091
    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:
    Magneto-Optical Study of NiFe/Au/Co/Au Layers
    Autorzy:
    Mazalski, P.
    Postava, K.
    Tekielak, M.
    Maziewski, A.
    Urbaniak, M.
    Szymański, B.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810594.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.-d
    75.70.-i
    75.70.Ak
    78.20.Ls
    Opis:
    Sputtered NiFe/Au/Co/Au layers with noncollinear magnetizations are of scientific interest for unusual magnetization behavior and their potential application in spintronics. In this paper, we propose to use a material selective sensitivity of magneto-optical Kerr effect for separation of signals from different materials in a bilayer system. The materials selective sensitivity is demonstrated on a sample with two mutually perpendicular Co and NiFe wedges.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 369-371
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Tailoring of Domains in NiFe/Au/Co/Au Multilayers by He Ion Bombardment through Nanospheres
    Autorzy:
    Glapka, W.
    Kuświk, P.
    Sveklo, I.
    Urbaniak, M.
    Jóźwiak, K.
    Weis, T.
    Engel, D.
    Ehresmann, A.
    Błaszyk, M.
    Szymański, B.
    Maziewski, A.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810578.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.-i
    75.60.-d
    Opis:
    Sputter deposited $(Ni_{80}Fe_{20}//Au//Co//Au)_{10}$ multilayers, characterized by alternating in-plane and perpendicular anisotropies of the NiFe and Co layers, respectively, and out-of-plane stripe (labyrinth) domain structure in the Co layers, were bombarded by $He^+$-ions (10 keV) through a mask consisting of polystyrene nanospheres with a diameter of 470 nm. The changes of multilayers magnetic properties after ion bombardment are correlated with the used mask structure.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 348-351
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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