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Title: Enhancing polarization by electrode-controlled strain relaxation in PbTiO{sub 3} heterostructures

A large remanent polarization close to theoretical value 80 μC/cm{sup 2} of bulk PbTiO{sub 3} is achieved in epitaxial heterostructures of (120–600)-nm-thick PbTiO{sub 3} films grown by pulsed laser deposition on (001) SrTiO{sub 3} substrate using a 100-nm-thick SrRuO{sub 3} bottom electrode layer. The heterostructures employing a 50-nm-thick electrode exhibit a significantly smaller polarization of ≤60 μC/cm{sup 2}. A detailed x-ray diffraction analysis of the crystal structure allows for relating this large polarization to electrode-controlled relaxation of epitaxial strain in PbTiO{sub 3}. Based on the observed results, we anticipate that the electrode-promoted strain relaxation can be used to enhance polarization in other epitaxial ferroelectric films.
Authors:
; ; ; ;  [1]
  1. Microelectronics and Materials Physics Laboratories, University of Oulu, P.O. Box 4500, FI-90014 Oulu (Finland)
Publication Date:
OSTI Identifier:
22499245
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 4; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; ELECTRODES; ENERGY BEAM DEPOSITION; EPITAXY; FERROELECTRIC MATERIALS; FILMS; LASER RADIATION; LAYERS; LEAD COMPOUNDS; POLARIZATION; PULSED IRRADIATION; RELAXATION; STRAINS; STRONTIUM TITANATES; SUBSTRATES; X-RAY DIFFRACTION