Strain evolution in La0.6Sr0.4CoO3−δ and SrTi0.3Fe0.7O3−δ multilayer systems

Sergej Ražnjević; Sandra Drev; Andreas E. Bumberger; Matthäus Siebenhofer; Christin Böhme; Christoph Riedl; Jürgen Fleig; Miran Čeh; Markus Kubicek; Zaoli Zhang

doi:10.1063/5.0250573

Strain evolution in La0.6Sr0.4CoO3−δ and SrTi0.3Fe0.7O3−δ multilayer systems

S Sergej Ražnjević (Erich Schmid Institute of Materials Science, Austrian Academy of Sciences 1 , Jahnstraße 12, Leoben 8700,) S Sandra Drev (Center for Electron Microscopy and Microanalysis, Jožef Stefan Institute 2 , Jamova cesta 39, Ljubljana 1000,) A Andreas E. Bumberger (Institute of Chemical Technologies and Analytics, TU Wien 3 , Getreidemarkt 9, Vienna A-1060,) M Matthäus Siebenhofer (Institute of Chemical Technologies and Analytics, TU Wien 3 , Getreidemarkt 9, Vienna A-1060,) C Christin Böhme (Institute of Chemical Technologies and Analytics, TU Wien 3 , Getreidemarkt 9, Vienna A-1060,) C Christoph Riedl (Department of Physics, Network Science Institute) J Jürgen Fleig (Institute of Chemical Technologies and Analytics, TU Wien 3 , Getreidemarkt 9, Vienna A-1060,) M Miran Čeh (Center for Electron Microscopy and Microanalysis, Jožef Stefan Institute 2 , Jamova cesta 39, Ljubljana 1000,) M Markus Kubicek (Institute of Chemical Technologies and Analytics, TU Wien 3 , Getreidemarkt 9, Vienna A-1060,) Z Zaoli Zhang

Abstract

In this work, we investigated La0.6Sr0.4CoO3−δ / SrTi0.3Fe0.7O3−δ multilayer systems with different layer thicknesses. Reciprocal space mapping showed splitting of the reflections in the sample with 5 nm layers while for 15 nm thick layers reflections have been elongated. Using transmission electron microscopy, we investigated this phenomenon at the atomic scale and showed that the alternating 15 nm layers gradually increase their tensile out-of-plane strain, whereas the sample with 5 nm layers maintains a relatively stable strain state. In-plane strain relaxation is similar in both samples. Still, it differs in the strain relaxation mechanism, which involves the formation of amorphous regions in the 5 nm sample and the formation of edge dislocations in the 15 nm sample. Electron energy loss spectroscopy was employed to probe the oxidation states of Co, Fe, and Ti. In both samples, the oxygen vacancy concentration increases toward the surface.

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Article Details

Journal Journal of Applied Physics

Volume / Issue Vol. 137, Issue 12

Published March 28, 2025

DOI 10.1063/5.0250573

ISSN 0021-8979

Publisher American Institute of Physics

Journal Info

Journal of Applied Physics

American Institute of Physics

ISSN: 0021-8979 Physical Sciences

Authors (10)

S

Sergej Ražnjević

Erich Schmid Institute of Materials Science, Austrian Academy of Sciences 1 , Jahnstraße 12, Leoben 8700,

S

Sandra Drev

Center for Electron Microscopy and Microanalysis, Jožef Stefan Institute 2 , Jamova cesta 39, Ljubljana 1000,

A

Andreas E. Bumberger