X-Ray Diffraction Studies of 180° Ferroelectric Domains in PbTiO3/SrTiO3 Superlattices under an Applied Electric Field

The dielectric response of PbTiO3/SrTiO3 superlattices is studied using electrical and structural measurements. While the dielectric response of paraelectric superlattices is well accounted for by the lattice contribution, superlattices with ferroelectric compositions exhibit an enhanced permittivity. X-ray diffraction allowed the presence of ordered nanodomains in ferroelectric superlattices to be established and their displacement under an applied bias to be directly probed, demonstrating that the enhanced permittivity in these artificial materials is due to domain wall motion.