Coercive fields in ferroelectrics: A case study in lithium niobate and lithium tantalate

Sungwon Kim, Venkatraman Gopalan, Alexei Gruverman

Research output: Contribution to journalArticle

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The experimentally measured coercive electric fields for domain reversal in ferroelectrics are typically many orders of magnitude lower than the estimates from phenomenological free-energy theory. This letter specifically investigates the influence of polarization gradients at pre-existing 180° domain walls in ferroelectrics on coercive fields for domain wall motion. It is shown that the ratio of theoretical coercive field without and with a preexisting domain wall is directly proportional to the ratio xo/a, where a is the lattice parameter and 2xo is the polarization wall width. This factor is 7.5-45 for a 20-120 nm wall width, the latter width determined here as the experimental upper limit for polarization wall width in lithium tantalate.

Original languageEnglish (US)
Pages (from-to)2740-2742
Number of pages3
JournalApplied Physics Letters
Issue number15
StatePublished - Apr 15 2002


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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