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Bending-induced isostructural transitions in ultrathin layers of van der Waals ferrielectrics

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [3];  [3];  [4];  [4];  [2];  [5];  [6];  [7]
  1. National Academy of Sciences of Ukraine, Kyiv (Ukraine); Penn State University
  2. National Academy of Sciences of Ukraine, Kyiv (Ukraine)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  4. Pennsylvania State University, University Park, PA (United States)
  5. University of Aveiro (Portugal)
  6. Uzhhorod University (Ukraine)
  7. University of Tennessee, Knoxville, TN (United States)
Using Landau-Ginzburg-Devonshire (LGD) phenomenological approach we analyze the bending-induced re-distribution of electric polarization and field, elastic stresses and strains inside ultrathin layers of van der Waals ferrielectrics. We consider a CuInP2S6 (CIPS) thin layer with fixed edges and suspended central part, the bending of which is induced by external forces. The unique aspect of CIPS is the existence of two ferrielectric states, FI1 and FI2, corresponding to big and small polarization values, which arise due to the specific four-well potential of the eighth-order LGD functional. When the CIPS layer is flat, the single-domain FI1 state is stable in the central part of the layer, and the FI2 states are stable near the fixed edges. With an increase of the layer bending below the critical value, the sizes of the FI2 states near the fixed edges decreases, and the size of the FI1 region increases. When the bending exceeds the critical value, the edge FI2 states disappear being substituted by the FI1 state, but they appear abruptly near the inflection regions and expand as the bending increases. The bending-induced isostructural FI1-FI2 transition is specific for the bended van der Waals ferrielectrics described by the eighth (or higher) order LGD functional with consideration of linear and nonlinear electrostriction couplings. Furthermore, the isostructural transition, which is revealed in the vicinity of room temperature, can significantly reduce the coercive voltage of ferroelectric polarization reversal in CIPS nanoflakes, allowing for the curvature-engineering control of various flexible nanodevices.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; SC0021118
OSTI ID:
2282697
Alternate ID(s):
OSTI ID: 2455098
OSTI ID: 2212817
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 263; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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