Direct Observation of Continuous Electric Dipole Rotation in Flux-Closure Domains in Ferroelectric Pb(Zr,Ti)O3

被引：390

作者：

Jia, Chun-Lin ^{[1
,2
]}

Urban, Knut W. ^{[1
,2
]}

Alexe, Marin ^{[3
]}

Hesse, Dietrich ^{[3
]}

Vrejoiu, Ionela ^{[3
]}

机构：

[1] Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany

[3] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany

来源：

SCIENCE | 2011年 / 331卷 / 6023期

关键词：

FILMS; MICROSCOPY; SCALE; LAYER;

D O I：

10.1126/science.1200605

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Low-dimensional ferroelectric structures are a promising basis for the next generation of ultrahigh-density nonvolatile memory devices. Depolarization fields, created by incompletely compensated charges at the surfaces and interfaces, depress the polarization of such structures. Theory suggests that under conditions of uncompensated surface charges, local dipoles can organize in flux-closure structures in thin films and vortex structures in nano-sized ferroelectrics, reducing depolarization fields. However, the continuous rotation of the dipoles required in vortex structures and the behavior of unit cell dipoles in flux-closure structures have never been experimentally established. By aberration-corrected transmission electron microscopy, we obtained experimental evidence for continuous rotation of the dipoles closing the flux of 180 domains in a ferroelectric perovskite thin film.

引用

页码：1420 / 1423

页数：4

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