We investigate experimentally and numerically the polarization hysteresis loop of a PZT thin film utilized in MEMS actuators. A fully coupled electromechanical phase-field technique is employed for the numerical prediction part, starting from a simplified model of the thin film proposed on the basis of several experimental evidences. It is shown that polycrystalline nature of the film plays a fundamental role. In particular the simulations demonstrate that grains with dielectric interfaces and stochastic orientation of the crystallographic directions have a significant impact on the overall hysteresis loop.

On the simulation of the hysteresis loop of polycrystalline PZT thin films

Fedeli, Patrick;Cuneo, Federico;Magagnin, Luca;Nobili, Luca;Frangi, Attilio
2020-01-01

Abstract

We investigate experimentally and numerically the polarization hysteresis loop of a PZT thin film utilized in MEMS actuators. A fully coupled electromechanical phase-field technique is employed for the numerical prediction part, starting from a simplified model of the thin film proposed on the basis of several experimental evidences. It is shown that polycrystalline nature of the film plays a fundamental role. In particular the simulations demonstrate that grains with dielectric interfaces and stochastic orientation of the crystallographic directions have a significant impact on the overall hysteresis loop.
2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1158103
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