Magnetic properties and interfacial phenomena of epitaxial perovskite oxides depend sensitively on parameters such as film thickness and strain state. In this work, epitaxial La0.67Sr0.33CoO3 (LSCO)/La0.67Sr0.33MnO3 (LSMO) bilayers were grown on NdGaO3 (NGO) and LaAlO3 (LAO) substrates with a fixed LSMO thickness of 6 nm, and LSCO thickness (tLSCO) varying from 2 to 10 nm. Soft x-ray magnetic spectroscopy revealed that magnetically active Co2+ ions that strongly coupled to the LSMO layer were observed below a critical tLSCO for bilayers grown on both substrates. On LAO substrates, this critical thickness was 2 nm, above which the formation of Co2+ ions was quickly suppressed leaving only a soft LSCO layer with mixed valence Co3+/Co4+ ions. The magnetic properties of both LSCO and LSMO layers displayed strong tLSCO dependence. This critical tLSCO increased to 4 nm on NGO substrates, and the magnetic properties of only the LSCO layer displayed tLSCO dependence. A non-magnetic layer characterized by Co3+ ions and with a thickness below 2 nm exists at the LSCO/substrate interface for both substrates. The results contribute to the understanding of interfacial exchange spring behavior needed for applications in next generation spintronic and magnetic memory devices.
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21 November 2022
Research Article|
November 15 2022
Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers
Special Collection:
Special Collection Recognizing Women in Applied Physics
Mingzhen Feng
;
Mingzhen Feng
(Data curation, Formal analysis, Methodology, Software, Writing – original draft, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California
, Davis, California 95616, USA
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Nolan J. Ahlm;
Nolan J. Ahlm
(Data curation, Formal analysis, Methodology)
1
Department of Materials Science and Engineering, University of California
, Davis, California 95616, USA
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Alexander M. Kane
;
Alexander M. Kane
(Data curation, Formal analysis, Resources)
1
Department of Materials Science and Engineering, University of California
, Davis, California 95616, USA
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I-Ting Chiu;
I-Ting Chiu
(Data curation, Formal analysis, Resources)
2
Department of Chemical Engineering, University of California
, Davis, California 95616, USA
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Dayne Y. Sasaki
;
Dayne Y. Sasaki
(Data curation, Formal analysis, Resources)
1
Department of Materials Science and Engineering, University of California
, Davis, California 95616, USA
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Padraic Shafer
;
Padraic Shafer
(Data curation, Resources, Software, Writing – review & editing)
3
Advanced Light Source, Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
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Alpha T. N'Diaye
;
Alpha T. N'Diaye
(Data curation, Resources, Software)
3
Advanced Light Source, Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
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Apurva Mehta
;
Apurva Mehta
(Data curation, Resources, Software)
4
Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
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Yayoi Takamura
Yayoi Takamura
a)
(Conceptualization, Funding acquisition, Investigation, Supervision, Writing – review & editing)
1
Department of Materials Science and Engineering, University of California
, Davis, California 95616, USA
a)Author to whom correspondence should be addressed: ytakamura@ucdavis.edu
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a)Author to whom correspondence should be addressed: ytakamura@ucdavis.edu
Note: This paper is part of the Special Collection Recognizing Women in Applied Physics.
J. Appl. Phys. 132, 195301 (2022)
Article history
Received:
August 21 2022
Accepted:
October 25 2022
Citation
Mingzhen Feng, Nolan J. Ahlm, Alexander M. Kane, I-Ting Chiu, Dayne Y. Sasaki, Padraic Shafer, Alpha T. N'Diaye, Apurva Mehta, Yayoi Takamura; Strain- and thickness-dependent magnetic properties of epitaxial La0.67Sr0.33CoO3/La0.67Sr0.33MnO3 bilayers. J. Appl. Phys. 21 November 2022; 132 (19): 195301. https://doi.org/10.1063/5.0122009
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