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Proceedings Paper

Barkhausen noise in relaxor ferroelectrics
Author(s): Lambert K. Chao; Eugene V. Colla; Michael B. Weissman
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Paper Abstract

Relaxor ferroelectrics form a diverse class of materials which typically show cooperative freezing into a nonergodic glassy state without long-range ferroelectric order. We discuss Barkhausen noise techniques in the non-ferroelectric regimes of the relaxors as a probe of the types of glassy order present. Preliminary data on PMN/PT (10% and 32%) show dipole moment step sizes which shrink abruptly upon cooling into the relaxor regime. This is similar to previous results on PMN, but with interesting differences possibly due to the larger ferroelectric correlations in PMN/PT: namely, a history dependence of the noise and a smaller dynamic step size despite larger static ferroelectric correlations. In light of these noise results and aging behavior in PMN/PT and SBN:La, we discuss a tentative new picture we recently proposed of freezing in PMN and related relaxors (analogous to that in reentrant spin glasses) as well as constraints on theoretical models for the relaxors.

Paper Details

Date Published: 9 May 2003
PDF: 6 pages
Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003);
Show Author Affiliations
Lambert K. Chao, Univ. of Illinois/Urbana-Champaign (United States)
Eugene V. Colla, Univ. of Illinois/Urbana-Champaign (United States)
Michael B. Weissman, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5112:
Noise as a Tool for Studying Materials
Michael B. Weissman; Nathan E. Israeloff; A. Shulim Kogan, Editor(s)

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