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Magnetic Characteristics and Bloch Coefficients in Sr2Fe1-xMo1+xO6-δ Films
Kiselev D. A.
1, Starukhina S. S.1, Bykov A. S.
1, Petrov A.V.2, Yudenkov A. G.3, Kalanda N. A.2
1National University of Science and Technology MISiS, Moscow, Russia
2Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, Belarus
3State Center “Belmicroanalysis” of the Scientific-Technical Center of JSC “INTEGRAL”, Minsk, Belarus
2Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, Belarus
3State Center “Belmicroanalysis” of the Scientific-Technical Center of JSC “INTEGRAL”, Minsk, Belarus
Email: dm.kiselev@misis.ru, sofya.starukhina@mail.ru, bykov_alex@misis.ru, petrov@physics.by, andreyudenkov95@gmail.com, kalanda@physics.by
In this work, the modes of obtaining single-phase Sr2Fe1-xMo1+xO6-δ films obtained by the ion-beam sputtering method have been developed and their magnetic characteristics were investigated. It was found that the dependence of magnetization on temperature M(T), measured in a magnetic field of 0.1 T, does not obey the Bloch law for any of the studied films. Its description required the use of Dyson corrections taking into account the contribution of magnons with large wave vectors. It was found that for the composition of films with an excess of iron and with its deficiency, the value of B (Bloch coefficient) increases with an increase in the superstructural ordering of Fe/Mo (P) cations B. At the same time, in the films of the Sr2Fe1.2Mo0.8O6-δ composition, with an increase in P, the thermal stability is lower than in films of the Sr2Fe0.9Mo1.1O6-δ composition, whereas with a decrease in P - it is vice versa. It has been shown that by controlling the composition and synthesis modes of films of the compositions Sr2Fe1.2Mo0.8O6-δ and Sr2Fe0.9Mo1.1O6-δ, it is possible to control the value of B, and hence the thermal stability of the spin polarization of the entire system. Keywords: double perovskites, ion beam deposition, magnetic characteristics, antistructural defects, Bloch coefficients.
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