Experimental demonstration of tunable hybrid improper ferroelectricity in double-perovskite superlattice films

Yaoxiang Jiang, Jianguo Niu, Cong Wang (), Donglai Xue, Xiaohui Shi, Weibo Gao () and Shifeng Zhao ()
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Yaoxiang Jiang: Inner Mongolia University
Jianguo Niu: Inner Mongolia University
Cong Wang: Beijing University of Chemical Technology
Donglai Xue: Inner Mongolia University
Xiaohui Shi: Inner Mongolia University
Weibo Gao: Nanyang Technological University
Shifeng Zhao: Inner Mongolia University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Hybrid improper ferroelectricity can effectively avoid the intrinsic chemical incompatibility of electronic mechanism for multiferroics. Perovskite superlattices, as theoretically proposed hybrid improper ferroelectrics with simple structure and high technological compatibility, are conducive to device integration and miniaturization, but the experimental realization remains elusive. Here, we report a strain-driven oxygen octahedral distortion strategy for hybrid improper ferroelectricity in La2NiMnO6/La2CoMnO6 double-perovskite superlattices. The epitaxial growth mode with mixed crystalline orientations maintains a large strain transfer distance more than 90 nm in the superlattice films with lattice mismatch less than 1%. Such epitaxial strain permits sustainable long-range modulation of oxygen octahedral rotation and tilting, thereby inducing and regulating hybrid improper ferroelectricity. A robust room-temperature ferroelectricity with remnant polarization of ~ 0.16 μC cm−2 and piezoelectric coefficient of 2.0 pm V−1 is obtained, and the density functional theory calculations and Landau-Ginsburg-Devonshire theory reveal the constitutive correlations between ferroelectricity, octahedral distortions, and strain. This work addresses the gap in experimental studies of hybrid improper ferroelectricity for perovskite superlattices and provides a promising research platform and idea for designing and exploring hybrid improper ferroelectricity.

Date: 2024
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DOI: 10.1038/s41467-024-49707-x

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