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Title: Correlation between epitaxial strain and magnetic properties in La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 bilayers

Abstract

Magnetic properties arising at interfaces of perovskite oxides such as La0.7Sr0.3CoO3 (LSCO) and La0.7Sr0.3MnO3 (LSMO) depend sensitively on the fine details of their structural properties. In this work, we use high-resolution transmission electron microscopy and spectroscopy to examine the structural and electronic phenomena at the interfaces in two LSCO/LSMO bilayers with reversed growth order. Two different strain mechanisms are at work in these films: compressive or tensile epitaxial strain, and distortion of the octahedral tilt pattern to maintain a network of corner-sharing octahedra. While the epitaxial strain is constant regardless of the growth order, the modification of the octahedral tilt pattern depends on whether the film is grown directly on the substrate or as the second sublayer. As a consequence, exchange spring behavior is observed only when the LSCO sublayer is grown first. The different mechanisms of strain accommodation within the oxygen octahedra network in each material proved to be of critical importance in determining the interfacial structure and thus magnetic and electronic properties of the bilayers.

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [3]
  1. Department of Materials Science and Engineering, University of California, Davis, Davis, California 95616, USA
  2. Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA
  3. Physical and Computational Science Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1507390
Report Number(s):
PNNL-SA-142751
Journal ID: ISSN 0021-8979
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 8; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Byers, J. Paige, Li, Binzhi, Chopdekar, Rajesh V., Ditto, Jeffrey, Johnson, David C., Takamura, Yayoi, and Browning, Nigel D. Correlation between epitaxial strain and magnetic properties in La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 bilayers. United States: N. p., 2019. Web. doi:10.1063/1.5054003.
Byers, J. Paige, Li, Binzhi, Chopdekar, Rajesh V., Ditto, Jeffrey, Johnson, David C., Takamura, Yayoi, & Browning, Nigel D. Correlation between epitaxial strain and magnetic properties in La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 bilayers. United States. doi:10.1063/1.5054003.
Byers, J. Paige, Li, Binzhi, Chopdekar, Rajesh V., Ditto, Jeffrey, Johnson, David C., Takamura, Yayoi, and Browning, Nigel D. Thu . "Correlation between epitaxial strain and magnetic properties in La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 bilayers". United States. doi:10.1063/1.5054003.
@article{osti_1507390,
title = {Correlation between epitaxial strain and magnetic properties in La 0.7 Sr 0.3 CoO 3 /La 0.7 Sr 0.3 MnO 3 bilayers},
author = {Byers, J. Paige and Li, Binzhi and Chopdekar, Rajesh V. and Ditto, Jeffrey and Johnson, David C. and Takamura, Yayoi and Browning, Nigel D.},
abstractNote = {Magnetic properties arising at interfaces of perovskite oxides such as La0.7Sr0.3CoO3 (LSCO) and La0.7Sr0.3MnO3 (LSMO) depend sensitively on the fine details of their structural properties. In this work, we use high-resolution transmission electron microscopy and spectroscopy to examine the structural and electronic phenomena at the interfaces in two LSCO/LSMO bilayers with reversed growth order. Two different strain mechanisms are at work in these films: compressive or tensile epitaxial strain, and distortion of the octahedral tilt pattern to maintain a network of corner-sharing octahedra. While the epitaxial strain is constant regardless of the growth order, the modification of the octahedral tilt pattern depends on whether the film is grown directly on the substrate or as the second sublayer. As a consequence, exchange spring behavior is observed only when the LSCO sublayer is grown first. The different mechanisms of strain accommodation within the oxygen octahedra network in each material proved to be of critical importance in determining the interfacial structure and thus magnetic and electronic properties of the bilayers.},
doi = {10.1063/1.5054003},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 125,
place = {United States},
year = {2019},
month = {2}
}

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