Autor: Dul, Ł. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of the Grain Size on the Magnetic Properties of $TbMnO_{3}$
Autorzy:: Bażela, W.
Dul, M.
Dyakonov, V.
Gondek, Ł.
Hoser, A.
Hoffmann, J.
Penc, B.
Szytuła, A.
Kravchenko, Z.
Nosalev, I.
Zarzycki, A.
Powiązania:: https://bibliotekanauki.pl/articles/1431251.pdf
Data publikacji:: 2012-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.05.Cp
61.05.F-
61.05.J-
75.30.kz
75.50.Ee
75.50.-y
Opis:: The magnetic properties including magnetic structure of poly and nano samples of $TbMnO_{3}$ are determined. All the samples investigated are antiferromagnets. In these samples the Mn ad Tb moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=($k_{x}$,0,0) with different value of $k_{x}$ for the Mn and Tb sublattices. Comparison of the data for poly and nano samples indicates the decrease of the moment and increase of the $k_{x}$ component of propagation vector in the nano specimens. The wide Bragg peak related to the Tb sublattice suggests that the magnetic order has the claster-like character. The magnetic moments value in both sublattices is smaller, whereas the $k_{x}$ values are larger for nano samples.
Źródło:: Acta Physica Polonica A; 2012, 121, 4; 785-788
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle $TbMnO_3$
Autorzy:: Bażela, W.
Dul, M.
Dyakonov, V.
Gondek, Ł.
Hoser, A.
Hoffmann, J.
Penc, B.
Szytuła, A.
Kravchenko, Z.
Nosalev, I.
Zarzycki, A.
Powiązania:: https://bibliotekanauki.pl/articles/1419577.pdf
Data publikacji:: 2012-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.Cx
75.47.Lx
75.25.-j
75.50.Ee
Opis:: This paper reports on investigations of magnetic properties, crystal and magnetic structures on $TbMnO_3$ prepared in various ways, namely, as conventional polycrystalline sample and two nano particle specimens (synthesized with a sol-gel method at temperatures of 800 and 850°C). The X-ray and neutron diffraction data confirm the orthorhombic crystal structure (space group Pbnm, No. 62) without noticeable differences of the lattice parameters for poly- and nanocompounds. For the polycrystalline sample, a subsequent ordering of the Mn and Tb sublattices with decreasing temperature was observed. Namely, the Mn sublattice exhibits a modulated magnetic structure with the propagation vector k = (0, $k_{x},$ 0) in between 41-5 K. Below T = 21 K, a change from a collinear ($A_{y}$ mode) into non-collinear ($A_{y}G_{z}$ mode) structure was evidenced. Further decreasing of temperature below 10 K results in magnetic ordering of the Tb sublattice (modulated $G_{x}A_{y}F_{z}$ mode). For nanoparticle compounds, magnetic ordering in the Mn and Tb sublattices is described by propagation vector k = (0, $k_{y},$ 0), with $k_{y}$ components higher than observed for polycrystalline sample. The magnetic ordering in the Mn sublattice is described by a collinear $A_{y}$ mode down to 1.6 K where the Tb moment becomes ordered ($G_{x}A_{y}$ mode). The observed broadening of the Bragg peaks connected to the Tb sublattice suggests the cluster-like character of its magnetic structure.
Źródło:: Acta Physica Polonica A; 2012, 122, 2; 384-390
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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