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    Wyświetlanie 1-4 z 4
    Tytuł:
    Crystal electric field parameters determination for R2Fe14B compounds based on Yamada - Kato model
    Autorzy:
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147342.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal electric field parameters
    model Yamada-Kato
    Mössbauer effect
    permanent magnet materials
    spin reorientation
    Opis:
    Semi-empirical model developed by Yamada-Kato enables calculation of magnetic spin directions for R2Fe14B compounds, based on minimization of free energy, and - in further steps - determination of spin reorientation temperatures for transitions from basal plane to axial easy magnetization direction. In our study, this model has been successfully used to determine crystal field and exchange field parameters for Er2-xCexFe14B compounds based on spin reorientation temperatures obtained experimentally from Mössbauer measurements.
    Źródło:
    Nukleonika; 2013, 58, 1; 31-33
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer and Magnetometric Studies of Spin Reorientations in Er$\text{}_{2-x}$Th$\text{}_{x}$Fe$\text{}_{14}$B
    Autorzy:
    Wojciechowska, A.
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046203.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.25.+z
    Opis:
    The Er$\text{}_{2-x}$Th$\text{}_{x}$Fe$\text{}_{14}$B (x=0.5, 1.0, 1.5) polycrystalline compounds have been investigated with $\text{}^{57}$Fe Mössbauer spectroscopy in the 50-330 K temperature range and magnetometry in the temperature range of 4.2-340 K. Initial magnetization vs. temperature measurements allowed us to establish the temperature regions of reorientations and also the Curie temperatures of the compounds. The spin reorientation phenomena (changes from planar to axial spin arrangements) have been studied extensively by a narrow step temperature Mössbauer scanning in the vicinity of the spin reorientation temperatures. From the analysis of the obtained Mössbauer spectra it was deduced that in the region of transition each subspectrum was split into two Zeeman sextets, which were characterised by different hyperfine magnetic fields and quadrupole splittings. A consistent way of describing the Mössbauer spectra in the wide range of temperatures was proposed. The composition and temperature dependences of hyperfine interaction parameters and subspectra contributions were derived from experimental spectra. The transition temperatures were determined for all the compounds studied and the spin phase diagram was constructed.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 427-432
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Search for canted spin arrangement in Er2-xTbxFe14B with Mössbauer spectroscopy
    Autorzy:
    Kurzydło, P. M.
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Oleszak, D.
    Przewoźnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147036.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer effect
    permanent magnet materials
    spin diagrams
    spin reorientation
    Opis:
    The materials studied were polycrystalline compounds Er2-xTbxFe14B (x = 0.1, 0.2, 0.3, 0.4) which crystallize in a tetragonal lattice and display a variety of spin arrangements. The compounds have been measured with 57Fe Mössbauer spectroscopy over the temperature range 80–320 K in order to investigate the spin reorientation processes. Each compound was studied in a wide temperature range, with precise Mössbauer scanning in the vicinity of the transition. The set of spectra obtained for a given compound was analyzed using simultaneous fi tting procedure to investigate the infl uence of the transition on the shape of the spectra. The fi tting program was specifi ed to analyze the transition according to the ‘two state model’: spins fl ip abruptly from initial angle to fi nal arrangement (90° angle). Obtained results suggest that spin reorientation process cannot be described using only the mentioned above model. Additional computer simulations based on the Yamada–Kato model were conducted to determine temperature range and the type of spin alignments in the vicinity of the transition. These theoretical results supported by spectra analysis suggest the existence of intermediate (canted) spin arrangements in the studied compounds. The spin arrangement diagram was constructed.
    Źródło:
    Nukleonika; 2015, 60, 1; 93-96
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin reorientation process in Tm2–xHoxFe14B : analysis of conical arrangement based on Mössbauer spectra
    Autorzy:
    Kurzydło, P. M.
    Pędziwiatr, A. T.
    Bogacz, B. F.
    Przewoźnik, J.
    Oleszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148120.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    permanent magnetic materials
    Mössbauer effect
    spin reorientation
    spin diagrams
    Opis:
    The spin reorientation process in the Tm2–xHoxFe14B series of compounds was studied using 57Fe Mössbauer spectroscopy over the temperature range 5.2–320 K with a focus on the analysis of conical spin arrangement. Each compound was studied by precise Mössbauer scanning in the vicinity of the transition and during the transition. By applying computer simulations based on the simplified Yamada-Kato model, as well as on some literature data for R2Fe14B (R = Tm, Ho) compounds, the above series was selected for studies as it contains compounds with different spin arrangements (axial, planar, conical). It was a crucial requirement for obtaining unambiguous angular dependences when applying a simultaneous fitting procedure of Mössbauer spectra. Such an extended procedure was applied which allowed the temperature dependence of the angle describing the position of the magnetization vector to be obtained. The results were compared with those from theoretical simulations. The spin arrangement diagram was constructed. A conical spin arrangement was confirmed over a wide temperature range.
    Źródło:
    Nukleonika; 2017, 62, 2; 123-127
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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