Ferroelectricity

Optical properties of Sr$_{0.6}$Ba$_{0.4}$Nb$_2$O$_6$ films on single-crystal MgO(001) and MgO(110) substrates

Yu. V. Tekhtelev^a, N. V. Korchikova^a, A. V. Pavlenko<sup>bc

a</sup> Lugansk State Pedagogical University
^b Research Institute of Physics, Southern Federal University
^c Southern Research Center of the Russian Academy of Sciences, Rostov-on-Don

Abstract: The optical characteristics of Sr$_{0.6}$Ba$_{0.4}$Nb$_2$O$_6$ (SBN60) films of different thicknesses grown by RF cathodic sputtering in oxygen atmosphere on MgO(001) and MgO(110) substrates were studied using spectrophotometry and ellipsometry. It has been established that only when SBN60 films grow on MgO(110) substrates, a significant anisotropy of their optical properties is detected, which increases with decreasing film thickness. The reasons for the revealed regularities, as well as the role of the film nanostructure in the analysis of their optical properties, are discussed.

Keywords: thin films, magnesium oxide, barium-strontium niobate, spectrophotometry, ellipsometry.

Received: 23.03.2025
Revised: 07.04.2025
Accepted: 07.04.2025

DOI: 10.61011/FTT.2025.04.60552.56-25

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