Polarization switching in (001)-oriented Pb(Mg1/3Nb2/3)O3-x%PbTiO3 crystals:: Direct observation of heterogeneous nucleation by piezoreponse force microscopy

被引：11

作者：

Bai, FM ^{[1
]}

Li, JF ^{[1
]}

Viehland, D ^{[1
]}

机构：

[1] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 19期

关键词：

D O I：

10.1063/1.1819993

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polarization switching in (001)-oriented Pb(Mg1/3Nb2/3)O-3-x%PbTiO3, PMN-x%PT, crystals for x=20 and 35 has been investigated in situ by scanning force microscopy in a piezoresponse mode, under a step-increased dc electrical voltage (V-dc). The results demonstrate that switching initiates by the nucleation of nanosized polar regions with a reversed polarization. For x=20, nucleation occurs heterogeneously throughout the volume of the crystal. However, with increasing PT content, nucleation tends to preferentially initiate near preexisting twin boundaries; with increasing V-dc, the domains becoming increasingly "diffuse" due to heterogeneous nucleation and growth throughout the crystal. (C) 2004 American Institute of Physics.

引用

页码：4457 / 4459

页数：3

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