Properties of highly (100) oriented Ba0.9Sr0.1TiO3/LaNiO3 heterostructuresprepared by chemical solution routes

Highly (100) oriented Ba0.9Sr0.1TiO3/LaNiO3 heterostructures have been grow n on Si(100) using chemical solution routes. X-ray diffraction analysis sho ws that Ba0.9Sr0.1TiO3 thin films are high (100) orientation (alpha (100)=0 .92). Atomic force microscopy investigation shows that they have large grai ns about 80-200 nm. A Pt/Ba0.9Sr0.1TiO3/LaNiO3 capacitor has been fabricate d and showed excellent ferroelectricity, the remnant polarization and coerc ive field are 10.8 muC/cm(2) and 96 kV/cm, respectively. The electric field dependence of capacitance measurement shows that the capacitor has large c apacitance tuning ([C-max-C-min]/C(max)x100%) of 63%. The Ba0.9Sr0.1TiO3 th in films have high dielectric constant (epsilon) of 200 at 1 MHz. (C) 2001 American Institute of Physics.