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hysteresis loops for PZT at . The inset shows domain switching and nonswitching current responses under .
(a) Fatigue profiles for PZT with different pulse widths of in a full duty of cycling, where the solid lines are the best fitting of the data according to Eqs. (1)–(5). (b) Switching number dependence of nonswitching charge density with different pulse widths under measuring voltage of .
Pulse width dependence of fatigue factor extracted from solid-line fitting of fatigue profiles in Fig. 2(a). The solid lines are the best fitting of the data according to Eqs. (6) and (7).
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