C-AXIS PREFERRED ORIENTATION OF LASER-ABLATED EPITAXIAL PBTIO3 FILMS AND THEIR ELECTRICAL-PROPERTIES

Ferroelectric PbTiO3 epitaxial thin films have been formed on a base electrode of Pt(100)/MgO(100) using ArF excimer laser ablation. The x-ray diffraction patterns of these films show c-axis orientation with a rocking angle of 0.5 when the film is cooled faster than 75 degrees C/min after the deposition. The films exhibit clear and large ferroelectric hysteresis loops. The dielectric constant of the films is 130 and remnant polarization is 80 mu C/cm(2). The values are almost the same as those theoretically predicted. The pyroelectric coefficient of these films is 1000-1500 V/W at 10 Hz, even without poling treatment,