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

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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.

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

Authors and Affiliations

  1. Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, Hefei, 230026, China

    Lili Qu, Da Lan, Kexuan Zhang, Feng Jin, Zixun Zhang, Enda Hua, Binbin Chen, Guanyin Gao, Lingfei Wang & Wenbin Wu

  2. Institut für Festkörperphysik, TU Wien, 1040, Vienna, Austria

    Liang Si & Karsten Held

  3. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China

    Chao Ma

  4. 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

    Shasha Wang, Feng Chen & Haifeng Du

  5. Insititutes of Physical Science and Information Technology, Anhui University, Hefei, 230601, China

    Liqiang Xu

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  1. Lili Qu
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Qu, L., Lan, D., Si, L. et al. Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices. Nano Res. 14, 3621–3628 (2021). https://doi.org/10.1007/s12274-021-3644-0

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