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

Author:

Dai Cheng1ORCID,Hong Zijian2ORCID,Das Sujit3ORCID,Tang Yun-Long45ORCID,Martin Lane W.4ORCID,Ramesh Ramamoorthy4ORCID,Chen Long-Qing1ORCID

Affiliation:

1. Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University 1 , University Park, Pennsylvania 16802, USA

2. Lab of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University 2 , Hangzhou 310027, China

3. Materials Research Centre, Indian Institute of Science 3 , Bangalore, Karnataka 560012, India

4. Department of Materials Science and Engineering, University of California 4 , Berkeley, California 94720, USA

5. Shenyang National Laboratory for Materials Science Institute of Metal Research, Chinese Academy of Sciences 5 , Shenyang 110016, China

Abstract

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.

Funder

U.S. Department of Energy

Army Research Office

Science and Engineering Research Board

Indian Institute of Science

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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