Dipole spring ferroelectrics in superlattice SrTiO 3/BaTiO 3 thin films exhibiting constricted hysteresis loops

Pingping Wu, Xingqiao Ma, Yulan Li, Venkatraman Gopalan, Long Qing Chen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Ferroelectric superlattice heterostructures have recently been explored for potential applications in electronic devices. In this letter, we employed the phase-field approach to simulate the domain structure and switching of a (BaTiO 3) 8/(SrTiO 3) 3 superlattice film constrained by a GdScO 3 substrate. A constricted ferroelectric hysteresis loop was observed with a high saturation polarization but a small coercive field. The shape of the hysteresis loop is understood by analyzing the ferroelectric polarization distributions during switching. It is demonstrated that the multilayers stack behaves as dipole spring ferroelectric, named in analogy to exchange spring magnets in magnetic multilayers that show similar loops.

Original languageEnglish (US)
Article number092905
JournalApplied Physics Letters
Volume100
Issue number9
DOIs
StatePublished - Feb 27 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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