Simulations of domain pattern in lead-titanate by molecular dynamics simulations aided q-state Potts model

Amir Reza Ansari Dezfoli, Shih kang Lin, Wen Dung Hsu

研究成果: Article

摘要

Manipulation or detection of domain patterns in ferroelectrics is of great interest due to wide applications for such materials. Among all the simulation methods, q-state Potts model is a common method used to simulate the domain pattern of ferroelectrics. The method, however, expresses the effect of temperature and coupling energy between interacting cells in an implicit way. In this study, we developed a new scheme that can explicitly study the temperature and coupling energy effect on the domain pattern of ferroelectrics. The method combined molecular dynamics (MD) simulations with a modified q-state Potts model. In the traditional q-state Potts model, each state is represented by a constant. Here we propose that the states are a function of temperature. We tested our method with a standard Jp in various temperatures. The results are consistent with those by phase-field method. The effect of Jp was also studied. By adjusting the Jp, effect of external stress/strain or the buffer layer on the domain pattern of PbTiO3 may be simulated. The correlation between the hysteresis loop and changing of domain pattern was also investigated. This new method provides insights in evolution of domain patterns in terms of temperature, the coupling energy and external electric voltage.

原文English
文章編號6664
頁(從 - 到)221-226
頁數6
期刊Computational Materials Science
110
DOIs
出版狀態Published - 2015 十二月 1

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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