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Domain alignment within ferroelectric/dielectric PbTiO 3 /SrTiO 3 superlattice nanostructures

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C7NR07203A· OSTI ID:1423429
 [1];  [2];  [3];  [4];  [3];  [4];  [5];  [6];  [7];  [3]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Materials Science and Engineering; University of Wisconsin-Madison
  2. Univ. of Connecticut, Storrs, CT (United States). Dept. of Physics
  3. Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Materials Science and Engineering
  4. Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Center for Hierarchical Material Design, Northwestern-Argonne Inst. of Science and Engineering
  7. Univ. of Connecticut, Storrs, CT (United States). Dept. of Physics and Dept. of Materials Science and Engineering and Inst. of Material Science
The ferroelectric domain pattern within lithographically defined PbTiO3/SrTiO3 ferroelectric/dielectric heteroepitaxial superlattice nanostructures is strongly influenced by the edges of the structures. Synchrotron X-ray nanobeam diffraction reveals that the spontaneously formed 180° ferroelectric stripe domains exhibited by such superlattices adopt a configuration in rectangular nanostructures in which domain walls are aligned with long patterned edges. The angular distribution of X-ray diffuse scattering intensity from nanodomains indicates that domains are aligned within an angular range of approximately 20° with respect to the edges. Computational studies based on a time-dependent Landau–Ginzburg–Devonshire model show that the preferred direction of the alignment results from lowering of the bulk and electrostrictive contributions to the free energy of the system due to the release of the lateral mechanical constraint. This unexpected alignment appears to be intrinsic and not a result of distortions or defects caused by the patterning process. Thus, our work demonstrates how nanostructuring and patterning of heteroepitaxial superlattices allow for pathways to create and control ferroelectric structures that may appear counterintuitive.
Research Organization:
Argonne National Laboratory (ANL); Univ. of Wisconsin-Madison, Madison, WI (United States)
Sponsoring Organization:
National Science Foundation (NSF); Oak Ridge Institute for Science and Education (ORISE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)
Grant/Contract Number:
AC02-06CH11357; FG02-04ER46147
OSTI ID:
1423429
Alternate ID(s):
OSTI ID: 1432062
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 7 Vol. 10; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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