Energy landscape scheme for an intuitive understanding of complex domain dynamics in ferroelectric thin films

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Title
Energy landscape scheme for an intuitive understanding of complex domain dynamics in ferroelectric thin films
Author(s)
Tae Heon Kim; Jong-Gul Yoon; Seung Hyub Baek; Woong-kyu Park; Sang Mo Yang; Seung Yup Jang; Taeyuun Min; Jin-Seok Chung; Chang-Beom Eom; Tae Won Noh
Publication Date
2015-06
Journal
SCIENTIFIC REPORTS, v.5, no., pp.11625 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Fundamental understanding of domain dynamics in ferroic materials has been a longstanding issue because of its relevance to many systems and to the design of nanoscale domain-wall devices. Despite many theoretical and experimental studies, a full understanding of domain dynamics still remains incomplete, partly due to complex interactions between domain-walls and disorder. We report domain-shape-preserving deterministic domain-wall motion, which directly confirms microscopic return point memory, by observing domain-wall breathing motion in ferroelectric BiFeO3 thin film using stroboscopic piezoresponse force microscopy. Spatial energy landscape that provides new insights into domain dynamics is also mapped based on the breathing motion of domain walls. The evolution of complex domain structure can be understood by the process of occupying the lowest available energy states of polarization in the energy landscape which is determined by defect-induced internal fields. Our result highlights a pathway for the novel design of ferroelectric domain-wall devices through the engineering of energy landscape using defect-induced internal fields such as flexoelectric fields
URI
https://pr.ibs.re.kr/handle/8788114/2015
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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