Squareness Control in Polarization-Electric Field Hysteresis Curves in Rhombohedral Pb(Zr,Ti)O_3 Films

摘要

Squareness in polarization-electric field hysteresis loops of (100)-oriented epitaxial and fiber-textured rhombohedral Pb(Zr,Ti)O_3 films prepared on (100) SrTiO_3 and (100) Si substrates, respectively, was investigated as a function of temperature. The ratio of remanent polarization to saturation polarization (P_r/P_(sat)) decreased with increasing temperature for all films. It depends on the kind of substrates and the remained strain in the in-plane orientation. These data suggest that the existing strain in the films possibly affects the temperature dependence of the P_r/P_(sat) ratio.