Robust In‐Plane Ferroelectricity in Ultrathin Epitaxial Aurivillius Films

• DOI: 10.1002/admi.202000202
• Publication Date: 2020-05-29T11:34:51Z
• Authors: Elzbieta Gradausk...; Marco Campanini; Banani Biswas; Christof W. Schne...; Manfred Fiebig; Marta D. Rossell; Morgan Trassin
• Keywords: Aurivillius; Orthorhombic crystal system

Abstract Layered ferroelectrics, often referred to as natural superlattices, exhibit functionalities beyond those of the classical ferroelectric perovskite compounds due their highly anisotropic structure. Unfortunately, layered architecture has been impeding growth single crystalline thin films, and thus integration into oxide‐electronic devices. Here, fatigue‐free switching in epitaxial Bi 5 FeTi 3 O 15 films is demonstrated. The achievement twin‐free with sub‐unit‐cell thickness precision on a lattice‐matching NdGaO orthorhombic substrate significantly enhances uniaxial properties. In ultrathin regime, such in‐plane polarization periodic arrangement domains, which, anisotropy, results nominally charged domain walls. ferroelectricity remarkable endurance after 10 cycles Aurivillius breaks new ground for alternative device paradigms that are less susceptible limitations arising from depolarizing‐field effects regime.