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Nano Research 2021, 14(10): 3621-3628 https://doi.org/10.1007/s12274-021-3644-0
Research Article | Issue | Published: 28 June 2021

Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices

Show Author's Information Lili Qu1,§,  Da Lan1,§,  Liang Si2,§,  Chao Ma3,  Shasha Wang4,  Liqiang Xu5,  Kexuan Zhang1,  Feng Jin1,  Zixun Zhang1,  Enda Hua1,  Binbin Chen1,  Guanyin Gao1,  Feng Chen4,  Haifeng Du4,  Karsten Held2,  Lingfei Wang1( ),  Wenbin Wu1( )
Hefei National Laboratory for Physical Science at the Microscale,University of Science and Technology of China, ,Hefei,230026,China;
Institut für Festkörperphysik,TU Wien,1040,Vienna, Austria ;
College of Materials Science and Engineering,Hunan University,Changsha,410082,China;
Anhui Key Laboratory of Condensed Matter Physics at the Extreme Conditions,High Magnetic Field Laboratory and Hefei Science Center, Chinese Academy of Sciences,Hefei,230031,China;
Insititutes of Physical Science and Information Technology,Anhui University,Hefei,230601,China;

§ Lili Qu, Da Lan, and Liang Si contributed equally to this work.

Keywords:
charge transfer, oxide heterointerfaces, asymmetric interfacial effects, ferromagnetic order
Topics:
Magnetic properties
Cite this article:
Qu L, Lan D, Si L, et al. Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices. Nano Research, 2021, 14(10): 3621-3628. https://doi.org/10.1007/s12274-021-3644-0
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Abstract Full text Electronic supplementary material About this article

Interfacial magnetism in functional oxide heterostructures not only exhibits intriguing physical phenomena but also implies great potential for device applications. In these systems, interfacial structural and electronic reconstructions are essential for improving the stability and tunability of the magnetic properties. In this work, we constructed ultra-thin La0.67Ca0.33MnO3 (LCMO) and SrRuO3 (SRO) layers into superlattices, which exhibited a robust ferromagnetic phase. The high Curie temperature (TC) reaches 291 K, more than 30 K higher than that of bulk LCMO. We found that the LCMO/SRO superlattices consisted of atomically-sharp and asymmetric heterointerfaces. Such a unique interface structure can trigger a sizable charge transfer as well as a ferroelectric-like polar distortion. These two interfacial effects cooperatively stabilized the high-TC ferromagnetic phase. Our results could pave a promising approach towards effective control of interfacial magnetism and new designs of oxide-based spintronic devices.


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Electronic supplementary material
About this article

Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices

Show Author's information Lili Qu1,§, Da Lan1,§, Liang Si2,§, Chao Ma3, Shasha Wang4, Liqiang Xu5, Kexuan Zhang1, Feng Jin1, Zixun Zhang1, Enda Hua1, Binbin Chen1, Guanyin Gao1, Feng Chen4, Haifeng Du4, Karsten Held2, Lingfei Wang1( ), Wenbin Wu1( )
Hefei National Laboratory for Physical Science at the Microscale,University of Science and Technology of China, ,Hefei,230026,China;
Institut für Festkörperphysik,TU Wien,1040,Vienna, Austria ;
College of Materials Science and Engineering,Hunan University,Changsha,410082,China;
Anhui Key Laboratory of Condensed Matter Physics at the Extreme Conditions,High Magnetic Field Laboratory and Hefei Science Center, Chinese Academy of Sciences,Hefei,230031,China;
Insititutes of Physical Science and Information Technology,Anhui University,Hefei,230601,China;

§ Lili Qu, Da Lan, and Liang Si contributed equally to this work.

Abstract

Interfacial magnetism in functional oxide heterostructures not only exhibits intriguing physical phenomena but also implies great potential for device applications. In these systems, interfacial structural and electronic reconstructions are essential for improving the stability and tunability of the magnetic properties. In this work, we constructed ultra-thin La0.67Ca0.33MnO3 (LCMO) and SrRuO3 (SRO) layers into superlattices, which exhibited a robust ferromagnetic phase. The high Curie temperature (TC) reaches 291 K, more than 30 K higher than that of bulk LCMO. We found that the LCMO/SRO superlattices consisted of atomically-sharp and asymmetric heterointerfaces. Such a unique interface structure can trigger a sizable charge transfer as well as a ferroelectric-like polar distortion. These two interfacial effects cooperatively stabilized the high-TC ferromagnetic phase. Our results could pave a promising approach towards effective control of interfacial magnetism and new designs of oxide-based spintronic devices.

Keywords: charge transfer, oxide heterointerfaces, asymmetric interfacial effects, ferromagnetic order

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Publication history
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Acknowledgements

Publication history

Received: 15 March 2021
Revised: 23 May 2021
Accepted: 02 June 2021
Published: 28 June 2021
Issue date: October 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work has supported by the National Basic Research Program of China (Nos. 2016YFA0401003, 2017YFA0403502, and 2020YFA0309100), the National Natural Science Foundation of China (Nos. 11974326, 12074365, 11804342, U2032218, and 51872278), the Fundamental Research Funds for the Central Universities (Nos. WK2030000035 and WK2340000102), and Hefei Science Center CAS. L. S. and K. H. were supported by the Austrian Science Fund (FWF) through Projects Nos. P30997 and P32044. Calculations have been done on the Vienna Scientific Clusters (VSC).

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