Noise and aging studies of relaxor ferroelectrics

M. B. Weissman, E. V. Colla, L. K. Chao

Research output: Contribution to journalConference articlepeer-review

Abstract

A combination of noise and aging data on relaxor ferroelectrics shows that this category of glassy system contains materials with diverse physics. Barkhausen noise studies of several cubic relaxor materials indicate that the sizes of dynamically coherent units are limited by competition between driving field energies and barrier heights. At the onset of glassy behavior, the coherent dipole moment changes drop rapidly, indicating rapid increase in barrier heights. Several different cubic relaxors show aging effects similar to spinglasses in the frozen glassy regime. However, the scale of fields needed to disrupt aging is inconsistent with models of spinglass order among ferroelectric nanodomains. We propose a model similar to reentrant xy spinglasses, in which the glass freezing is from polarization components orthogonal to the ferro polarization. A prediction of this model is that uniaxial relaxors should not show spinglass aging in their frozen state, and this prediction is confirmed.

Original languageEnglish (US)
Pages (from-to)40-50
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5469
DOIs
StatePublished - Sep 13 2004
EventFluctuations and Noise in Materials - Maspalomas
Duration: May 26 2004May 28 2004

Keywords

  • Aging
  • Ferroelectric
  • Glass
  • Ising
  • Noise
  • Random
  • Relaxor
  • Spinglass

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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