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Wyszukujesz frazę "Szymański, K." wg kryterium: Autor


Wyświetlanie 1-6 z 6
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:
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:
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
    Wyświetlanie 1-6 z 6

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