2020 年 128 巻 8 号 p. 431-435
Artificial superlattice thin films of (Pb0.9Sr0.1)TiO3 (PST)n/SrTiO3 (STO)m were grown on SrRuO3-electroded DyScO3 (001)pc substrates by pulsed laser deposition. X-ray diffraction (XRD) showed that the fabricated superlattice thin films have a good periodicity in the out-of-plane direction, indicating the sharp interfaces regardless of the difference in layer thickness. Synchrotron XRD indicated that the film with n/m = 14/20 had a weak periodicity in the in-plane direction, which may had arisen from the ordered polar vortex arrays existing in the PST layers. All the fabricated superlattice thin films showed the electric field-induced strain, though its magnitude was smaller than that for typical ferroelectric materials.