Pulse width dependent polarizations of ferroelectric (Pb,La)(Zr,Ti)O-3 thin film capacitors

We report the measurements of pulse polarizations of (Pb,La)(Zr,Ti)O-3 ferr oelectric capacitors as a function of pulse width. Pulse polarizations were measured from the switching current responses in the pulse width range fro m 1 mus to 1 s. The relation between pulse polarizations(switched(P*) and n on-switched polarization(P-boolean AND)) and hysteresis loop parameters was studied. In the case of all write/read pulse widths are same. P* increased but P-boolean AND decreased with increasing pulse width. These results are explained by poling effects and confirmed by measuring pulse width depende ncies with different patterns of pulse trains.