Abstract
The influence of local stress on the polarization switching of a two-dimensional ferroelectric thin film is investigated by a multi-field coupling model of flexoelectric effect. The evolution law of domain in a ferroelectric film under a local mechanical force is obtained. That is: under increasing mechanical stress, domain evolution in ferroelectric film will experience six stages “small angle of rotation→emergence of 90° domain switching→expansion of 90° domain→emergence of 180° domain switching→expansion of 180° domain→steady state”. f1111 related flexocoupling type and f1122 related flexocoupling type both play crucial roles in the whole switching process. 90° switching arises from the combined effect of the gradient of transverse strain in the thickness and horizontal direction as well as the gradient of out-of-plane strain in the horizontal direction, while 180° switching is attributed to the combined effect of the gradient of transverse strain and out-of-plane strain in the thickness direction.
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