Polarization fatigue and frequency-dependent recovery in Pb(Zr,Ti)O_3 epitaxial thin films with SrRuO_3 electrodes

摘要

Fatigue is investigated in epitaxial Pb(Zr,Ti)O_3 films grown on SrRuO_3/SrTiO_3 substrates with Ft or SrRuO_3 (SRO) top electrodes. It was experimentally determined that fatigue occurs irrespective of whether the top electrode is Pt or SRO. The fatigue behavior is strongly dependent on the frequency. A polarization recovery was observed for both types of top electrodes, but the recovery is almost complete for a SRO top electrode and only about 40% from the initial polarization value for Pt top electrodes. The results are tentatively explained by the frequency response of the deep traps and by migration of oxygen vacancies.