Magnetism, spintronics
Magnetic characteristics and Bloch coefficients in Sr$_2$Fe$_{1-x}$Mo$_{1+x}$O$_{6-\delta}$ thin films
D. A. Kiseleva,
S. S. Starukhinaa,
A. S. Bykova,
A. V. Petrovb,
A. G. Yudenkovc,
N. A. Kalandab a National University of Science and Technology «MISIS», Moscow
b Scientific-Practical Materials Research Centre of NAS of Belarus
c HC "Belmicroanalysis", Minsk
Abstract:
In this work, the modes of obtaining single-phase Sr
$_2$Fe
$_{1-x}$Mo
$_{1+x}$O
$_{6-\delta}$ 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 cations
$(P)$. At the same time, in the films of the Sr
$_2$Fe
$_{1-x}$Mo
$_{1+x}$O
$_{6-\delta}$ composition, with an increase in
$P$, the thermal stability is lower than in films of the Sr
$_2$Fe
$_{1.2}$Mo
$_{0.8}$O
$_{6-\delta}$ 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 Sr
$_2$Fe
$_{1.2}$Mo
$_{0.8}$O
$_{6-\delta}$ and Sr
$_2$Fe
$_{0.9}$Mo
$_{1.1}$O
$_{6-\delta}$, 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. Received: 20.08.2025
Revised: 20.08.2025
Accepted: 14.10.2025
DOI:
10.61011/FTT.2025.10.61970.239a-25
Fulltext:
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