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Title: Ferroelastic switching in a layered-perovskite thin film

Here, a controllable ferroelastic switching in ferroelectric/multiferroic oxides is highly desirable due to the non-volatile strain and possible coupling between lattice and other order parameter in heterostructures. However, a substrate clamping usually inhibits their elastic deformation in thin films without micro/nano-patterned structure so that the integration of the non-volatile strain with thin film devices is challenging. Here, we report that reversible in-plane elastic switching with a non-volatile strain of approximately 0.4% can be achieved in layeredperovskite Bi2WO6 thin films, where the ferroelectric polarization rotates by 90 within four in-plane preferred orientations. Phase-field simulation indicates that the energy barrier of ferroelastic switching in orthorhombic Bi2WO6 film is ten times lower than the one in PbTiO3 films, revealing the origin of the switching with negligible substrate constraint. The reversible control of the in-plane strain in this layered-perovskite thin film demonstrates a new pathway to integrate mechanical deformation with nanoscale electronic and/or magnetoelectronic applications.
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [1] ;  [6] ;  [7] ;  [8] ;  [3] ;  [5] ;  [1]
  1. Beijing Normal Univ., Beijing (China)
  2. Univ. of Antwerp, Antwerp (Belgium); Beijing Univ. of Technology, Beijing (China)
  3. Tsinghua Univ., Beijing (China)
  4. Univ. of Science and Technology of China, Hefei (China)
  5. Univ. of California, Berkeley, CA (United States)
  6. Chinese Academy of Science, Beijing (China)
  7. Univ. of Antwerp, Antwerp (Belgium)
  8. Tsinghua Univ., Beijing (China); The Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY physical sciences; materials science; nanotechnology; condensed matter