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JOURNALS // Fizika Tverdogo Tela // Archive

Fizika Tverdogo Tela, 2022 Volume 64, Issue 7, Pages 794–797 (Mi ftt11048)

This article is cited in 1 paper

Magnetism

Effect of oxygen content "stabilization" in La$_{0.8}$Sr$_{0.2}$MnO$_{3-\delta}$ films at post annealing in air

Yu. M. Nikolaenko, N. B. Efros, D. O. Fedyuk, I. Yu. Reshidova

Galkin Donetsk Institute for Physics and Engineering, Donetsk

Abstract: The variation of oxygen content in the epitaxial La$_{0.8}$Sr$_{0.2}$MnO$_{3-\delta}$ films of 12–75 nm thick onto NdGaO$_3$ substrates was quantitatively investigated by indirect method during heat treatment procedure in air at temperature range 873–1073 K. The experimental time dependences of oxygen content variation were investigated theoretically with taking into account the effect of inhomogeneous diffusion of oxygen over the films thickness to provide optimal choice of temperature and duration of the heat treatment procedure. In films 25–75 nm thick, the effect of “stabilization” of the oxygen content (OC = 3) is revealed, which indicates the presence of an energy barrier that prevents the incorporation of an excess oxygen atom into the near-surface layer of the film at optimal conditions of heat treatment.

Keywords: epitaxial films, strain, oxygen index, non-uniform oxygen diffusion.

Received: 08.11.2021
Revised: 31.03.2022
Accepted: 04.04.2022

DOI: 10.21883/FTT.2022.07.52563.236



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