We investigate in-plane ferroelectricity in an epitaxial ferroelectricdielectric (PTOSTO) superlattice under tensile strain. Using a combination of x-ray diffraction and piezoresponse force microscopy, we identify a strain-induced periodic in-plane nanoscale domain architecture with polarization along the base diagonals of the PTO unit cell. We scrutinize its switching behavior using local in-plane trailing fields from the scanning-probe tip. For an electric field pointing in the polarization direction of a specific domain state, we create stable single-domain areas of in-plane polarization at the scale of tens of micrometers. Our findings on controlling robust in-plane ferroelectricity in ultrathin ferroelectric layers can help one to develop device concepts unaffected by the detrimental effects of the depolarizing field.
Stabilization and manipulation of in-plane polarization in a ferroelectric|dielectric superlattice
Note: This paper is part of the Special Topic on Domains and Domain Walls in Ferroic Materials
Nives Strkalj, Marco Bernet, Martin F. Sarott, Jakob Schaab, Thomas Weber, Manfred Fiebig, Morgan Trassin; Stabilization and manipulation of in-plane polarization in a ferroelectric|dielectric superlattice. J. Appl. Phys. 7 May 2021; 129 (17): 174104. https://doi.org/10.1063/5.0035867
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