应变对 (PbTiO3)n/(SrTiO3)n 超晶格拓扑铁电极性构型稳定性的影响,Applied Physics Letters

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应变对 (PbTiO3)n/(SrTiO3)n 超晶格拓扑铁电极性构型稳定性的影响
Applied Physics Letters ( IF 3.5 ) Pub Date : 2023-08-04 , DOI: 10.1063/5.0160901
Cheng Dai ₁ , Zijian Hong ₂ , Sujit Das ₃ , Yun-Long Tang _{4,

5} , Lane W. Martin ₄ , Ramamoorthy Ramesh ₄ , Long-Qing Chen ₁

Affiliation

除了正常的铁电域态外，(PbTiO3)n/(SrTiO3)n (PTO/STO) 超晶格系统还表现出有趣的拓扑相（例如涡旋和斯格明子）。现有的研究主要集中在PTO/STO超晶格的拓扑极性分布和性质对其周期性的依赖性上。在这里，我们采用相场模拟研究应变对拓扑相变和铁电畴结构的影响。我们总结了各向同性应变（沿 x 方向的面内失配应变等于沿 y 方向的面内失配应变）周期性相图，显示了不同极性拓扑状态的稳定区域，包括正常铁电孪晶、涡旋、斯格明子及其混合物漩涡和双胞胎。我们还分析了各向异性面内应变（沿 x 方向的面内失配应变不等于沿 y 方向的面内失配应变）下的偏振构型，并证明应变各向异性可用于调整涡旋阵列沿任一方向的方向[100] pc 或 [010] pc 方向或迷宫涡旋阵列。这项工作为通过应变工程操纵 PTO/STO 超晶格中的极性结构提供了指导。

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Strain effects on stability of topological ferroelectric polar configurations in (PbTiO3)n/(SrTiO3)n superlattices

The (PbTiO3)n/(SrTiO3)n (PTO/STO) superlattice system has been shown to exhibit interesting topological phases (e.g., vortices and skyrmions) in addition to normal ferroelectric domain states. Existing studies are mostly focused on the dependence of topological polar distributions and properties of PTO/STO superlattice on its periodicity. Here, we study the strain effect on the topological phase transitions and ferroelectric domain structures employing phase-field simulations. We summarized in an isotropic strain (in-plane misfit strain along the x direction is equal to that along the y direction) periodicity phase diagram displaying the stability regions of different polar topological states, including normal ferroelectric twins, vortices, skyrmions, and mixtures of vortices and twins. We also analyzed the polarization configurations under anisotropic in-plane strains (in-plane misfit strain along the x direction is not equal to that along the y direction) and demonstrated that the strain anisotropy can be used to tune the directions of vortex arrays along either the [100] pc or [010] pc directions or labyrinth vortex arrays. This work offers guidance to manipulating polar structures in the PTO/STO superlattices via strain engineering.

更新日期：2023-08-04

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