D. A. Kiselev, S. S. Starukhina, A. S. Bykov, A. V. Petrov, A. G. Yudenkov, A. V. Semchenko, N. A. Kalanda, “Magnetic properties of Sr$_2$Fe$_{1-x}$Mo$_{1+x}$O$_{6-\delta}$ films deposited by ion-plasma sputtering”, PFMT, 2025, Issue 4(65),Pages 91

TECHNICS

Magnetic properties of Sr$_2$Fe$_{1-x}$Mo$_{1+x}$O$_{6-\delta}$ films deposited by ion-plasma sputtering

D. A. Kiselev^a, S. S. Starukhina^a, A. S. Bykov^a, A. V. Petrov^b, A. G. Yudenkov^c, A. V. Semchenko^d, N. A. Kalanda^b

^a National University of Science and Technology MISIS, Moscow
^b Scientific-Practical Materials Research Centre of the NAS of Belarus, Minsk
^c Scientific-Technical Center “Belmicroanalysis” of JSC “INTEGRAL”, Minsk
^d Francisk Skorina Gomel State University

Abstract: The anomalous dependence of the Bloch coefficient ($\mathbf{B}$) on the magnetic field in double perovskite Sr$_2$FeMoO$_{6-\delta}$ thin films was determined, which contradicts the classical model predicting the decrease of $\mathbf{B}$. It has been found that the value of $\mathbf{B}$ increases monotonically with the increase of the magnetic field (in the range of $0.01$–$0.16$ T). It was shown that this effect is not due to the dominance of the magnon contribution but is caused by the competition of demagnetization mechanisms associated with structural defects. The investigation results demonstrate that an external magnetic field alters the balance between magnon and defect contributions to thermal demagnetization.

Keywords: double perovskite, Sr$_2$FeMoO$_6$, Bloch's law, Bloch coefficient, thermal demagnetization, magnons, cation disorder, anti-phase boundaries.

UDC: 62-4:539.23:537.311.3:537.622

Received: 15.10.2025

DOI: 10.54341/20778708_2025_4_65_91