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1
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Reconstruction of the Exchange Integrals Map of ScFe₄Al₈ Magnetic Structure

100%
Rećko K., Dobrzyński L., Waliszewski J., Szymański K.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
424-426
EN
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.
2
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Maximum Entropy Method in Mössbauer Spectroscopy - a Problem of Magnetic Texture

100%
Satuła D., Szymański K., Dobrzyński L.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
78-80
EN
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.
3
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The Magnetic Properties of GaFeO_3 by Neutron Diffraction and Mössbauer Spectroscopy

100%
Rećko K., Szymański K., Dobrzyński L., Waliszewski J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
396-399
EN
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.
4
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Microstructure And Properties Of WC-Co HVAF Coatings Obtained From Standard, Superfine And Modified By Sub-Micrometric Carbide Powders

100%
Myalska H., Moskal G., Szymański K.
Archives of Metallurgy and Materials
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2015
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issue 2
5
Content available remote

Effect of Noncollinear Magnetic Order on the Hyperfine Interactions in Pt_{3}Fe

100%
Woźniakowski A., Deniszczyk J., Szymański K.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
65-67
EN
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 ^{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.
6
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Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method

88%
Satuła D., Kalska-Szostko B., Szymański K., Dobrzyński L., Kozubowski J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1615-1621
EN
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.
7
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Magnetic Moments' Arrangement in Fe Layers Deposited from Acetone Based Electrolyte

88%
Olszewski W., Szymański K., Satuła D., Biernacka M., Talik E.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1631-1640
EN
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.
8
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Electrochemical Deposition of Nanowires in Porous Alumina

76%
Kalska-Szostko B., Brancewicz E., Mazalski P., Sveklo J., Olszewski W., Szymański K., Sidor A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 2
542-544
EN
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.
9
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Hyperfine Interactions of ^{57}Fe in Pt_3Fe - Ab Initio and Mössbauer Effect Studies

76%
Deniszczyk J., Satuła D., Waliszewski J., Rećko K., Olszewski W., Parzych G., Szymański K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
197-199
EN
The Mössbauer effect and ab initio investigations of an electric field gradient at ^{57}Fe nuclei in Pt_3Fe compound are presented. It is shown that nonzero ^{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 ^{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.
10
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Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys

64%
Perzyńska K., Go A., Szymański K., Biernacka M., Hawełek Ł., Kalska-Szostko B., Oleszak D., Rećko K., Waliszewski J., Zaleski P.
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vol. 126
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issue 4
999-1004
EN
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.
11
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Effect of Annealing in Multicomponent bcc Alloys

64%
Szymański K., Perzyńska K., Satuła D., Dobrzyński L., Zaleski P., Waliszewski J., Rećko K., Biernacka M., Olszewski W.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
62-64
EN
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.
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