Observation of room-temperature ferroelectricity in tetragonal strontium titanate thin films on SrTiO3 (001) substrates

Abstract

We investigated the ferroelectric properties of strontium titanate (STO) thin films deposited on SrTiO3 (001) substrate with SrRuO3 electrodes. The STO layer was grown coherently on the SrTiO3 substrate without in-plane lattice relaxation, but its out-of-plane lattice constant increased with a decrease in the oxygen pressure during deposition. Using piezoresponse force microscopy and P-V measurements, we showed that our tetragonal STO films possess room-temperature ferroelectricity. We discuss the possible origins of the observed ferroelectricity.

References in corpus (1)

• Formation of Co nanoclusters in epitaxial Ti_{0.96} Co_{0.04} O_2 thin films and their ferromagnetism

Cited by in corpus (4)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Nanoscale Phenomena in Oxide Heterostructures
• Localized electronic states induced by defects and possible origin of ferroelectricity in strontium titanate thin films
• Oxygen deficiency and migration mediated electric polarization in Fe,Co-substituted SrTiO${}_{3-\delta }$