Suppression of creep-regime dynamics in epitaxial ferroelectric BiFeO3 films

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Title
Suppression of creep-regime dynamics in epitaxial ferroelectric BiFeO3 films
Author(s)
Yeong Jae Shin; Byung Chul Jeon; Sang Mo Yang; Hwang I.; Cho M.R.; Daniel Sando; Seung Ran Lee; Yoon J.-G.; Taewon Noh
Publication Date
2015-05
Journal
SCIENTIFIC REPORTS, v.5, no., pp.10485 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Switching dynamics of ferroelectric materials are governed by the response of domain walls to applied electric field. In epitaxial ferroelectric films, thermally-activated 'creep' motion plays a significant role in domain wall dynamics, and accordingly, detailed understanding of the system's switching properties requires that this creep motion be taken into account. Despite this importance, few studies have investigated creep motion in ferroelectric films under ac-driven force. Here, we explore ac hysteretic dynamics in epitaxial BiFeO3 thin films, through ferroelectric hysteresis measurements, and stroboscopic piezoresponse force microscopy. We reveal that identically-fabricated BiFeO3 films on SrRuO3 or La0.67Sr0.33MnO3 bottom electrodes exhibit markedly different switching behaviour, with BiFeO3/SrRuO3 presenting essentially creep-free dynamics. This unprecedented result arises from the distinctive spatial inhomogeneities of the internal fields, these being influenced by the bottom electrode's surface morphology. Our findings further highlight the importance of controlling interface and defect characteristics, to engineer ferroelectric devices with optimised performance
URI
https://pr.ibs.re.kr/handle/8788114/2018
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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