High-dielectric-tunability of ferroelectric (Pb, Sr)TiO3 thin films on (001) LaAlO3

摘要

Ferroelectric (Pb,Sr)TiO3 (PSTO) thin films were epitaxially grown on (001) LaAlO3 (LAO) by using pulsed laser deposition. 'Microstructural characterizations with x-ray diffraction and transmission electron microscopy indicate that the as-grown films have excellent single crystalline quality and a (001)(PSTO)//(001)(LAO) and [100](PSTO)//[100](LAO) interface relationship. Dielectric property measurements reveal that the as-grow films have a very high dielectric constant value of 3100 and very large dielectric tunability of 48% at 40 V/cm at room temperature. These excellent results suggest that the highly epitaxial ferroelectric (Pb, Sr)TiO3 thin films can be developed for room-temperature tunable microwave elements in wireless communication applications. (C) 2004 American Institute of Physics.