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강상관계 물질 연구단
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Controlled manipulation of oxygen vacancies using nanoscale flexoelectricity

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Title
Controlled manipulation of oxygen vacancies using nanoscale flexoelectricity
Author(s)
Saikat Das; Bo Wang; Ye Cao; Myung Rae Cho; Yeong Jae Shin; Sang Mo Yang; Lingfei Wang; Minu Kim; Sergei V. Kalinin; Long-Qing Chen; Tae Won Noh
Publication Date
2017-09
Journal
NATURE COMMUNICATIONS, v.8, no.1, pp.615 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Oxygen vacancies, especially their distribution, are directly coupled to the electromagnetic properties of oxides and related emergent functionalities that have implications for device applications. Here using a homoepitaxial strontium titanate thin film, we demonstrate a controlled manipulation of the oxygen vacancy distribution using the mechanical force from a scanning probe microscope tip. By combining Kelvin probe force microscopy imaging and phase-field simulations, we show that oxygen vacancies can move under a stress-gradient-induced depolarisation field. When tailored, this nanoscale flexoelectric effect enables a controlled spatial modulation. In motion, the scanning probe tip thereby deterministically reconfigures the spatial distribution of vacancies. The ability to locally manipulate oxygen vacancies on-demand provides a tool for the exploration of mesoscale quantum phenomena and engineering multifunctional oxide devices. © 2017 The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/5029
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
02_Das_et_al-2017-Nature_Communications.pdfDownload

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