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1
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Formation of MnBi by Mechanical Alloying

100%
Szlaferek A., Wrzeciono A.
Acta Physica Polonica A
|
1997
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vol. 92
|
issue 2
315-318
EN
In this report we demonstrate that mechanical alloying is an alternative process to produce the intermetallic compound MnBi. Magnetically MnBi powder is prepared from the elemental powders by mechanical alloying in a planetary ball mill and then solid-state reaction at a relatively low temperature. The MnBi powder was aligned in a magnetic field and isostatic pressed. The X-ray pattern of powder reacted clearly shows the intensity peaks of the MnBi phase. After annealing the magnetization was about 1.0×10^{-4}T m^{3}/kg.
2
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Electronic Structure of UCo_{4}B Compound

81%
Szajek A., Smardz L., Szlaferek A., Kowalczyk A.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
599-603
EN
UCo_{4}B is a member of uranium intermetallic borides family which crystallizes in the hexagonal CeCo_{4}B structure. The experimental data suggest the occurrence of the spin-fluctuation behaviour of UCo_{4}B. In this paper we present the results of band structure calculations using the ab-initio tight binding linear muffin-tin orbital method. We found good agreement between the experimental X-ray photoemission spectroscopy valence band spectrum and the ab-initio results.
3
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Martensitic Transformations and Magnetic Properties of Ni-Mn-Sn Heusler Alloy Films

81%
Dubowik J., Szlaferek A., Gościańska I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
163-168
EN
We report on structural and magnetic properties of Ni_{50}Mn_{50-x}Sn_x (x=12÷14) films and compare them with those of the bulk Ni-Mn-Sn alloys. Magnetic measurements reveal clear presence of martensitic transformation in bulk alloys but in the flash-evaporated Ni-Mn-Sn thin films martensitic transformation is usually less visible. The best film samples annealed for 1 h at about 900 K exhibit clear signs of martensitic transformation: i.e., a small defect in magnetization and a substantial increase in ferromagnetic resonance line width.
4
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Magnetic Properties in Mn Pure Powder

81%
Szlaferek A., Baszyński J., Waplak S., Jóźwiak K.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
311-314
EN
The structural and magnetic properties of deformed powder of Mn obtained by mechanical grinding have been investigated using X-ray diffraction and magnetic measurements. The small values of ferromagnetic moment of Mn after grinding are attributed to the formation of a deformed phase at the surface of grains with enlargement of the interatomic spacings at the grains boundaries.
5
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Spin Reorientation and Exchange Coupling in the Dy_{1-x}Er_{x}Fe_{10}Si_{2} Compounds

71%
Stefański P., Kowalczyk A., Skoryna D., Szlaferek A., Wrzeciono A.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
259-262
EN
The structural and magnetic properties of Dy_{1_{x}}Er_{x}Fe_{10}Si_{2} are investigated. X-ray analysis reveals that these compounds are of the tetragonal ThMn_{12} structure. In this structure the rare earth atoms occupy one crystallographic position 2(a). The unit cell contains 26 atoms. The spin reorientation temperature, T_{SR}, was measured from the temperature dependence of the initial susceptibility using an ac bridge of mutual inductance of the Harsthorn type. Dy^{+3} and Er^{+3} have opposite contributions to the entire magnetic anisotropy. The spin reorientation temperature is found to be about 271 K in DyFe_{10}Si_{2} and 48 K in ErFe_{10}Si_{2}. The values are discussed applying the crystal field model. The value of the rare earth-transition metal exchange coupling constant J_{RFe}/k_{B} derived from the mean-field model analysis of the Curie temperature is about -13 K. The Fe-Fe exchange integral is much higher and is equal to about 75 K.
6
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Magnetic Properties of Bacterial Nanoparticles

61%
Timko M., Džarová A., Kováč J., Kopčanský P., Gojzewski H., Szlaferek A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
381-383
EN
The objective of this study is to prepare and study magnetic properties of biological magnetic nanoparticles (magnetosomes) as a product of biomineralization process of magnetotactic bacteria Magnetospirillum sp. AMB-1. From temperature dependence of remanent magnetization and coercive field the Verwey transition is clearly seen at 105 K as a consequence of the large anisotropy along the chains of magnetosomes.
7
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Superconductivity and Electronic Structure of the W_7Re_{13}B Compound

61%
Kowalczyk A., Andrzejewski B., Jezierski A., Toliński T., Szlaferek A., Falkowski M., Chełkowska G.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
597-600
EN
The superconductor W_7Re_{13}B has been studied by the magnetic measurements and microwave absorption. The crystal structure of W_7Re_{13}B is cubic (β-Mn type). This compound exhibits a sharp superconducting transition at a temperature of T_c=7.2 K. The electronic structure of W_7Re_{13}B has been studied by X-ray photoelectron spectroscopy and the band structure has been calculated by the full-potential local-orbital minimum-basis method using the scalar-relativistic mode. The main contribution to the density of states at the Fermi level is from 5d electrons of W and Re. The W and Re bands are similar and substituting W by Re does not change the total density of states.
8
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Electronic Structure and Transport Properties of UFe_{2} System

61%
Szlaferek A., Szajek A., Baszyński J., Smardz L., Kowalczyk A., Timko M.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
815-818
EN
The electronic structure of the UFe_{2} compound was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding muffin tin orbital method. This compound crystallizes in a cubic Laves phase. The calculated valence band spectrum is characterized by two peaks due to U(5f) and Fe(3d) states. We have found a good agreement between the experimental valence band spectrum and theoretical ab initio calculations. The carrier concentration estimated from the Hall effect amounts to ≈10^{22} cm^{-3}.
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