STUDIES ON THE FATIGUE BEHAVIOR OF FERROELECTRIC FILM USING PREISACH APPROACH

ABSTRACT

The PREISACH approach is applied to provide further insight into the physical mechanisms of ferroelectric operation and degradation. Starting from the discussion on experimental determined PREISACH distribution, analytical formulae for the various fatigue cycles is deduced. Considerations about the uniform expression respects to the cycle numbers, and the ways to describe it are also made. The agreement between the measure and calculation illustrate such a description to be an efficient tool to model the ferroelectric fatigue behavior. This approach is also utilized to examine nature of cycling degradation, the excursion of defect charge and their effect on domain pinning is characterized quantificationally. This model seems quite appropriate to relate the degenerative loops with the actual defect structure.

Keywords:

• PREISACH approach
• ferroelectric fatigue

ACKNOWLEDGMENTS

This work is supported by the Key program of National Nature Science Foundation of China, No. 90407023. We would also like to thank Mr. Chi Sheng and Radient Corp. for the PZT capacitor sample.