Phase field model of domain structures and switching process in thin ferroelectric layers with deadlayers
The domain structure evolution and the polarization-applied field hysteresis in thin ferroelectric layers with deadlayers were studied by using phase field simulations. Simulation results demonstrate that the hysteresis loop depends on the deadlayer thickness and the strength of electrostatic interactions. Thin deadlayers and/or weaker electrostatic interactions produce a rectangular loop with large remnant polarization. Thicker deadlayers and/or stronger electrostatic interactions produce dumbbell shaped double loops with approximately zero remnant polarization. The transformation from a poled single-domain to poly-domain state can produce either the 180° domain structure when elastic interactions in the layer are weak, or the 90° c/a structure when elastic interactions are strong. It is demonstrated that the type of the domain structure produced by the single-domain to polydomain transformation can affect the path of the domain structure evolution under a varying applied field, and that the 180° domain structures can have either columnar or stripe morphology.
|Keywords||Ferroelectrics, Phase field models, Thin films|
|Conference||Materials Science and Technology Conference and Exhibition 2009, MS and T'09|
Artemev, A. (2009). Phase field model of domain structures and switching process in thin ferroelectric layers with deadlayers. In Materials Science and Technology Conference and Exhibition 2009, MS and T'09 (pp. 91–101).