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Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films

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  • Eun-Mi Choi

    (Department of Materials Science and Metallurgy, University of Cambridge
    Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University (SKKU))

  • Tuhin Maity

    (Department of Materials Science and Metallurgy, University of Cambridge
    School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram)

  • Ahmed Kursumovic

    (Department of Materials Science and Metallurgy, University of Cambridge)

  • Ping Lu

    (Sandia National Laboratories)

  • Zenxhing Bi

    (School of Materials Engineering, Purdue University)

  • Shukai Yu

    (Department of Physics, The Pennsylvania State University, University Park)

  • Yoonsang Park

    (Department of Physics, The Pennsylvania State University, University Park)

  • Bonan Zhu

    (Department of Materials Science and Metallurgy, University of Cambridge)

  • Rui Wu

    (Department of Materials Science and Metallurgy, University of Cambridge)

  • Venkatraman Gopalan

    (Department of Physics, The Pennsylvania State University, University Park)

  • Haiyan Wang

    (School of Materials Engineering, Purdue University)

  • Judith L. MacManus-Driscoll

    (Department of Materials Science and Metallurgy, University of Cambridge)

Abstract

Orthorhombic RMnO3 (R = rare-earth cation) compounds are type-II multiferroics induced by inversion-symmetry-breaking of spin order. They hold promise for magneto-electric devices. However, no spontaneous room-temperature ferroic property has been observed to date in orthorhombic RMnO3. Here, using 3D straining in nanocomposite films of (SmMnO3)0.5((Bi,Sm)2O3)0.5, we demonstrate room temperature ferroelectricity and ferromagnetism with TC,FM ~ 90 K, matching exactly with theoretical predictions for the induced strain levels. Large in-plane compressive and out-of-plane tensile strains (−3.6% and +4.9%, respectively) were induced by the stiff (Bi,Sm)2O3 nanopillars embedded. The room temperature electric polarization is comparable to other spin-driven ferroelectric RMnO3 films. Also, while bulk SmMnO3 is antiferromagnetic, ferromagnetism was induced in the composite films. The Mn-O bond angles and lengths determined from density functional theory explain the origin of the ferroelectricity, i.e. modification of the exchange coupling. Our structural tuning method gives a route to designing multiferroics.

Suggested Citation

  • Eun-Mi Choi & Tuhin Maity & Ahmed Kursumovic & Ping Lu & Zenxhing Bi & Shukai Yu & Yoonsang Park & Bonan Zhu & Rui Wu & Venkatraman Gopalan & Haiyan Wang & Judith L. MacManus-Driscoll, 2020. "Nanoengineering room temperature ferroelectricity into orthorhombic SmMnO3 films," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16101-2
    DOI: 10.1038/s41467-020-16101-2
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    Cited by:

    1. Yaoxiang Jiang & Jianguo Niu & Cong Wang & Donglai Xue & Xiaohui Shi & Weibo Gao & Shifeng Zhao, 2024. "Experimental demonstration of tunable hybrid improper ferroelectricity in double-perovskite superlattice films," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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