Abstract
Polarization fatigue of (Bi0.85Pr0.15)(Fe0.95Mn0.05)O3 (BPFMO) films is studied as functions of switching fields and frequencies. Poor fatigue resistance is observed at low switching frequencies and small cycling fields. An increase of dielectric constant is observed in accompany with the suppression of switchable polarization. Both the switchable polarization and the dielectric constant can be restored to their original values simultaneously by high electric field cycling. These characteristics are discussed in terms of migration and aggregation of oxygen vacancies on domain walls to block domain switching. The results support the domain wall pinning scenario for polarization degradation in BPFMO films.
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