Piezoelectric response of nanoscale $PbTiO3$ in composite $PbTiO3−CoFe2O4$ epitaxial films Available to Purchase

Piezoelectric properties of $PbTiO3$ in $1/3PbTiO3−2/3CoFe2O4$ transverse epitaxial nanostructures on differently oriented $SrTiO3$ were analyzed using conventional and switching-spectroscopy piezoelectric force microscopy. The results confirmed that the individual $PbTiO3$ nanocolumns in the $CoFe2O4$ matrix exhibit a detectable piezoelectric response regardless of substrate orientation. For the {100} and {110} orientations, a bias of $±10V$ produced ferroelectric domain switching; however, no switching was observed for the {111} films. Small values of piezoelectric constants $dzz(100)≈11pm/V$⁠, $dzz(110)≈5pm/V$⁠, and $dzz(111)≈3pm/V$ are attributed to the weak intrinsic response of the nano-$PbTiO3$ under strong mechanical and depolarizing-field constraints in the composite films.