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Magnetic Properties of DO_{3}-Type Alloys Based on Fe_{3}Si and Fe_{3}Al

100%
Parzych G., Jankowska-Kisielinska J., Dobrzyński L.
Acta Physica Polonica A
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2010
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vol. 117
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issue 4
578-581
EN
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.
2
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Application of Bayesian Reasoning and the Maximum Entropy Method to Some Reconstruction Problems

88%
Fornalski K., Parzych G., Pylak M., Satuła D., Dobrzyński L.
Acta Physica Polonica A
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2010
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vol. 117
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issue 6
892-899
EN
The so-called Bayesian reasoning is applied whenever uncertainty has to be considered as serious factor in interpretation of results. The paper presents analysis of the impact of inaccurate data on the straight line and quadratic relation fittings. This type of analysis is particularly important when one tries to decide on the type of dependence. The paper also shows examples of the Maximum Entropy Methods applied to the reconstruction of the hyperfine parameters distribution from the measured Mössbauer spectra of GaFeO_{3} and the electron-positron momentum distribution from the positron annihilation data of Gd.
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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.
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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.
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