Yttrium influence on magnetic properties and hyperfine interactions in multicomponent substitution alloys (Dy1-xYx)0.8Sm0.2Fe2
Umkhaeva Z. S.
1, Rusakov V. S.
2, Gubaydulina T. V.
2, Karpenkov A.Yu.
3, Tereshina I. S.
2, Pankratov N. Yu.
2, Aliev I. M.
11Kh. Ibragimov Complex Institute of the Russian Academy of Sciences, Groznyi, Russia
2Lomonosov Moscow State University, Moscow, Russia
3Tver State University, Tver, Russia
Email: zargan.umhaeva@yandex.ru, rusakov@phys.msu.ru, tgubaidulina@yandex.ru, Karpenkov_alex@mail.ru, irina_tereshina@mail.ru, pankratov@phys.msu.ru, ialiew@mail.ru
The paper presents the results of investigation of structure, magnetic properties and superfine interactions in multicomponent alloys based on rare-earth elements (R), Sm and their analogue Y of RFe2 stoichiometry. To obtain new multicomponent alloys, a complex type of substitution in the rare-earth sublattice was used, namely, weakly magnetic samarium atoms at a fixed concentration of 20 at.% were first introduced into the dysprosium sublattice, followed by non-magnetic yttrium atoms at the values of the substitution parameter x=0, 0.2, 0.4, 0.6, 0.8, 1.0. This type of substitution, first of all, leads to the competition of exchange interactions between magnetically active ions in a wide temperature region of their magnetic ordering. The competition also leads to a number of unique magnetic phase transformations in the resulting alloys, including the phenomenon of magnetic compensation of the rare-earth and 3d sublattice, as well as spin reorientation. The values of the main parameters of Mossbauer spectra on 57Fe nuclei in (Dy1-xYx)0.8Sm0.2Fe2 alloys and their dependence on yttrium concentration at T=300 K have been determined. The field dependences of magnetostriction in fields up to 12 kOe have been investigated. Keywords: Laves phases, magnetization, Curie temperature, magnetic moment, Mossbauer effect, hyperfine interactions.
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