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Three-State Ferroelastic Switching and Large Electromechanical Responses in PbTiO3 Thin Films.

  • Author(s): Damodaran, Anoop R
  • Pandya, Shishir
  • Agar, Josh C
  • Cao, Ye
  • Vasudevan, Rama K
  • Xu, Ruijuan
  • Saremi, Sahar
  • Li, Qian
  • Kim, Jieun
  • McCarter, Margaret R
  • Dedon, Liv R
  • Angsten, Tom
  • Balke, Nina
  • Jesse, Stephen
  • Asta, Mark
  • Kalinin, Sergei V
  • Martin, Lane W
  • et al.

Leveraging competition between energetically degenerate states to achieve large field-driven responses is a hallmark of functional materials, but routes to such competition are limited. Here, a new route to such effects involving domain-structure competition is demonstrated, which arises from strain-induced spontaneous partitioning of PbTiO3 thin films into nearly energetically degenerate, hierarchical domain architectures of coexisting c/a and a1 /a2 domain structures. Using band-excitation piezoresponse force microscopy, this study manipulates and acoustically detects a facile interconversion of different ferroelastic variants via a two-step, three-state ferroelastic switching process (out-of-plane polarized c+ → in-plane polarized a → out-of-plane polarized c- state), which is concomitant with large nonvolatile electromechanical strains (≈1.25%) and tunability of the local piezoresponse and elastic modulus (>23%). It is further demonstrated that deterministic, nonvolatile writing/erasure of large-area patterns of this electromechanical response is possible, thus showing a new pathway to improved function and properties.

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