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(Color online) The ferroelectric domain structure in a superlattice of BT8/ST3 shown with the BT layer on top surface (a), and the ST layer on the surface (b), respectively. The white and purple colors in the BT layer indicate the tetragonal c+ and c− domains, respectively. The mixed monoclinic (represented by blue, yellow, red, and dark red)/orthorhombic (represented by orange and green) phases are observed in the ST layer. (c) The polarization vector map at one cross-section plane of the domain structure in (a) or (b); the value of the polarization out of plane (see color bar) are reduced by P0 = 0.26 C/m2.
(Color online) The constricted PE hysteresis loop of BT8/ST3 superlattice on GdScO3 substrate, at room temperature. Several different values of background dielectric constant are used to investigate the influence of background dielectric constant on the hysteresis loop. The circle, square, triangle, diamond symbol lines represents k b = 1, 5, 10, and 50, respectively.
(Color online) The polarization distribution vector maps (a)-(e) are corresponding to the points a-e in Figure 2, respectively.
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