Ferroelectric Domains in PbTiO₃/SrTiO₃Superlattices

Novel high-temperature ferroelectric domain morphology in PbTiO3 ultrathin films

“…This is consistent with experimental XRD results for PbTiO 3 films of similar thickness [31,32] and PbTiO 3 /SrTiO 3 superlattices [19,33,34]. Morphologically, these are LandauLifshitz domains having 90 • closure domain caps at the surface as previously observed in theoretical studies of PbTiO 3 films using interatomic potentials [11,35].…”

Photoinduced Domain Pattern Transformation in Ferroelectric-Dielectric Superlattices

“…In contrast to the dependence on the absorbed optical intensity, Fig. 4(c) shows that the lattice parameter decreases at elevated temperature, consistent with the heating of PTO-based thin films on STO [28]. Unlike the optical experiment, in which the STO substrate remains close to room temperature, both the SL and STO substrate were heated in the laboratory experiments.…”

“…1(a). The PTO/STO SL system has well-defined ferroelectric properties, including low leakage and a systematic scaling of the Curie temperature and domain period with layer thickness and average composition [8,28]. The diagram in Fig.…”

“…Based on the value of θ at which the domain transformation is favored in LGD calculations, the charge density required to induce the domain transformation is 2×10 19 cm -3 (see Supplemental Materials) [40]. The value of the required defect density is within the range of reported defect concentrations [28,48]. Polarization screening would be expected to lead to downward uniform polarization, based on the direction observed in other SLs [49].…”

Depolarizing field in ultrathin electrocalorics

“…[24]. Such technique correctly predicts domain patterns and electric response of partially compensated films [25,26]. The quality of charge compensation is given in percentage of total surface charge screened, and is described by a parameter β. β =100% and β =0% correspond to a fully compensated and an uncompensated surface charge, respectively.…”