Complex polarization topologies in a confined PbTiO3 layer

ORAL

Abstract

The manipulation of charge and lattice boundary conditions of atomically precise low-dimensional complex oxide heterostructures can stabilize ferroelectric topologies such as polar vortices and skyrmion-like bubble domains. Recent discovery the continuous rotation of clockwise/counterclockwise ferroelectric vortices were observed in ferroelectric/paraelectric (PbTiO3)n/(SrTiO3)n superlattices on the DyScO3 substrate. In this work, we reduce the complexity of the ferroelectric/paraelectric superlattice to the study of a model system of a single confined PbTiO3 layer on different substrates. We will present experimental-theoretical study of the emergence of complex topologies of electrical polarization. Phase-field modeling predicts a systematic evolution of the polarization states corresponding to different strain conditions of the substrates and second principle calculation predicts the polar distribution of electrical topologies. By changing strain conditions, we characterize from polar vortices to skyrmion-like bubble domains by high resolution scanning transmission electron microscopy in conjunction with piezoelectric force microscopy study of ferroelectric structure and reciprocal space mapping study of domain periodicity.

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Presenters

  • S.-L. Hsu

    Department of Materials Science & Engineering, University of California, MSE, UC Berkeley, Department of Materials Science & Engineering, University of California, Berkeley

Authors

  • S.-L. Hsu

    Department of Materials Science & Engineering, University of California, MSE, UC Berkeley, Department of Materials Science & Engineering, University of California, Berkeley

  • Margaret McCarter

    Physics, UC Berkeley

  • Zijian Hong

    MSE, Penn State University

  • Y. L Tang

    Materials Science Division, Lawrence Berkeley National Laboratory, MSE, UC Berkeley

  • SUJIT DAS

    Department of Materials Science & Engineering, University of California, MSE, UC Berkeley

  • A. Ghosh

    Department of Materials Science & Engineering, University of California, MSE, UC Berkeley

  • Javier Junquera

    Universidad de Cantabria, Departamento de Ciencias de la Tierra y Fisica de la Materia Condensada, Universidad de Cantabria

  • Long-Qing Chen

    MSE, Penn State University, Materials Science and Engineering, The Pennsylvania State University, Department of Materials Science & Engineering, The Pennsylvania State University

  • Lane Martin

    MSE, UC Berkeley

  • Ramamoorthy Ramesh

    Department of Physics, University of California, Physics, Univ of California - Berkeley, MSE, UC Berkeley, Department of Materials Science & Engineering, University of California, Berkeley, Department of Materials Science and Engineering, University of California