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Wyświetlanie 1-10 z 10
Tytuł:
Inelastic Neutron Scattering in Sendust Alloy in 8-295 K Temperature Range
Autorzy:
Świderska, K.
Jankowska-Kisielińska, J.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419612.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.F-
75.30.Fv
75.40.-s
75.50.Lk
Opis:
The effects concerning magnetic and nuclear excitations in a single crystal of Sendust alloy (73.5 at.% Fe, 9.5 at.% Al, 17 at.% Si) are discussed. The excitations have been investigated by means of elastic and inelastic neutron scattering with the use of triple axis and small angle spectrometer. A few potential causes of spin wave damping in Sendust, like interactions of excitations or small-size precipitations of different compositions or directions of magnetization were disproved. It is suggested that one- and two-phonon scattering can explain observed strong increase of incoherent inelastic scattering with temperature.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 400-404
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $DO_{3}$-Type Alloys Based on $Fe_{3}Si$ and $Fe_{3}Al$
Autorzy:
Parzych, G.
Jankowska-Kisielinska, J.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/1538294.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Et
78.70.Nx
Opis:
The interest in magnetic properties of $DO_{3}$-type alloys stems from their ability to exhibit dependence of magnetic moments on local environment. It is shown that both, static and dynamic properties of the alloys based on $Fe_{3}Si$ and $Fe_{3}Al$ require further investigations. This concerns mainly the problem of selective substitution of chromium for iron, as well as spin dynamics, the latter problem is illustrated on the example of measured spin waves in Sendust.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 578-581
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:
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:
Electronic Energies of Interaction of Point Defects with Interfaces and Grain Boundaries
Autorzy:
Vasseur, J.O.
Deymier, P.A.
Akjouj, A.
Dobrzynski, L.
Djafari-Rouhani, B.
Powiązania:
https://bibliotekanauki.pl/articles/1892209.pdf
Data publikacji:
1992-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
73.40.-c
61.70.Yq
68.35.Dv
Opis:
The electronic energies of interaction of a point defect with interfaces and grain boundaries are calculated, as a function of the distance x$\text{}_{03}$ between the point defect and the corresponding planar defect. These interaction energies are shown to have the same type of oscillations as the corresponding local electronic densities. Therefore the electronic interactions more significantly affect the energy of segregation of point defects towards interfaces when x$\text{}_{03}$ is in the near vicinity of these interfaces, while at large distances the contribution of elastic interactions can dominate.
Źródło:
Acta Physica Polonica A; 1992, 81, 1; 39-46
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Crystal and Magnetic Behavior οf $ScFe_{4}Al_{8}$ Single Crystal
Autorzy:
Rećko, K.
Dobrzyński, L.
Lemée-Cailleau, M.
Waliszewski, J.
Talik, E.
Suski, W.
Courtois, P.
Powiązania:
https://bibliotekanauki.pl/articles/1810469.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.fm
61.05.cp
Opis:
Nuclear and magnetic properties of the $ScFe_{4}Al_{8}$ single crystal were found to exhibit unparalleled complexity of nuclear and magnetic structures. Our previous neutron measurements revealed presence of two modulation vectors, both along [ε, ε, 0], however with different critical temperatures. Recent experiments forced us to revise our knowledge of the structural ordering in the sample. So far, the crystal structure of this alloy, being of $ThMn_{12}$-type, has never been questioned.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 206-208
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Electronic Structure of Zn$\text{}_{1-x}$Mg$\text{}_{x}$ Mixed Crystals by Compton Spectroscopy Method
Autorzy:
Reniewicz, H.
Andrejczuk, A.
Dobrzyński, L.
Rećko, K.
Waliszewski, J.
Żukowski, E.
Firszt, F.
Łęgowski, S.
Męczyńska, H.
Szatkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1952072.pdf
Data publikacji:
1996-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.45.-d
61.80.Ed
71.55.Gs
Opis:
The first experimental study of the Compton profiles of Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se for x=0.25, 0.47, 0.56 mixed crystals is presented. The Compton profiles were measured with the use of the $\text{}^{241}$Am radioactive source with a resolution of 0.57 a.u. The experimentally obtained Compton profiles were compared with the theoretical ones based on the free-atom model. The results are interpreted in terms of outermost electrons of Zn and Mg being promoted to the higher momentum states, and 4p-electrons of Se becoming more delocalised in a solid, being thus promoted to the lower momentum states.
Źródło:
Acta Physica Polonica A; 1996, 90, 5; 907-910
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:
Positron Annihilation Characteristics in Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se Mixed Crystals
Autorzy:
Firszt, F.
Szatkowski, J.
Męczyńska, H.
Łęgowski, S.
Saarinen, K.
Hautojarvi, P.
Plazaola, A.
Reniewicz, H.
Dobrzyński, L.
Chabik, S.
Powiązania:
https://bibliotekanauki.pl/articles/1969067.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.55.Et
81.40.Ef
Opis:
Positron annihilation characteristics as a function of composition and annealing in zinc vapour were measured and compared with photoluminescence spectra for Zn$\text{}_{1-x}$Mg$\text{}_{x}$Se mixed crystals with 0 ≤ x ≤ 0.6. The positron annihilation data show that there is a substantial number of divacancies present in the system under study. The concentration of such defects is reduced at least by the factor of two upon annealing in zinc vapour.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 300-304
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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