期刊
ACTA MATERIALIA
卷 58, 期 1, 页码 67-75出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.08.057
关键词
Ferroelectricity; Nanostructure; Piezoelectricity
资金
- ARC DP [0666231, 0771432]
- UNSW Faculty Research
- Oak Ridge National Laboratory's Center for Nanophase Materials Sciences [CNMS2007-233]
- Scientific User Facilities Division
- Office of Basic Energy Sciences
- US Department of Energy
- Division of User facilities
- BES DOE
- SSPFM
Grain-to-grain long-range interactions and the ensuing collective dynamics in the domain behavior of nanostructured polycrystalline Pb(Zr,Ti)O(3) ferroelectric thin films have been investigated. To identify the key factors and interactions controlling local polarization dynamics we utilize a synergistic approach based on focused ion beam (FIB) milled damage-free nanostructures to isolate single grains and grain clusters, time-resolved piezoresponse force microscopy and switching spectroscopy PFM (SSPFM) (PFM) to address polarization dynamics within individual grains, and finite-element simulations to quantify the local ferroelectric interactions and hence assess the weight of several possible switching mechanisms. The experiments find that of the three possible switching mechanisms, namely direct electromechanical coupling, local built-in electric field and strain, and grain boundary electrostatic charges, the last one is the dominant mechanism. Although finite-element simulations find that direct electromechanical coupling and local built-in field-induced switching are possible, calculations confirm that for the utilized material properties, the aforementioned mechanisms are energetically unfavored. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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