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Nanoscale polarization relaxation and piezoelectric properties of SBN thin films

  • M. Melo*
  • , E. B. Araujo
  • , M. Ivanov
  • , V. Y. Shur
  • , A. L. Kholkin
  • *Corresponding author for this work
  • Universidade Estadual Paulista Júlio de Mesquita Filho
  • University of Aveiro
  • Ural Federal University

Research output: Chapter in Book/Report/Conference proceedingConference paperResearchpeer-review

2 Citations (Scopus)

Abstract

Randomly oriented Sr0.75Ba0.25Nb2O6 thin films have been deposited on Pt(111)/Ti/SiO2/Si substrates using a polymeric chemical route to study their peculiar nanopolar structures and local ferroelectric properties using piezoresponse force microscopy (PFM) technique. PFM images reveals grains with contrast among fully white and fully black, a clear indication of non-zero polarization in the SBN films far above Tm ∼ 221 K. Asymmetries observed in local hysteresis loops recorded at different grains suggest an imprint effect in the studied films due to an internal build-in electric field. Some grains show asymmetric hysteresis loops while other grains show symmetric hysteresis loops. The origin of the imprint effect observed in the SBN films is discussed in terms of complex defects associated to oxygen vacancies. The experimental relaxation curves were fitted using the Kohlrausch-Williams-Watts function. The time constant τ increases from 404 to 977 ms as the magnitude voltage increases.

Original languageEnglish
Title of host publication2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop, ISAF/ECAPD/PFM 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509018710
DOIs
Publication statusPublished - 27 Sept 2016
Externally publishedYes
Event2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop, ISAF/ECAPD/PFM 2016 - Darmstadt, Germany
Duration: 21 Aug 201625 Aug 2016

Publication series

Name2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop, ISAF/ECAPD/PFM 2016

Conference

Conference2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop, ISAF/ECAPD/PFM 2016
Country/TerritoryGermany
CityDarmstadt
Period21/08/1625/08/16

Keywords

  • SBN films
  • piezoresponse
  • polarization relaxation

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