DOI: 10.1073/pnas.2007736117
论文题名: Interface and surface stabilization of the polarization in ferroelectric thin films
作者: Gattinoni C. ; Strkalj N. ; Härdi R. ; Fiebig M. ; Trassin M. ; Spaldin N.A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 46 起始页码: 28589
结束页码: 28595
语种: 英语
英文关键词: Thin films | critical thickness | ferroelectricity | surface science
Scopus关键词: Article
; chemical interaction
; controlled study
; density functional theory
; electrochemical analysis
; polarization
; priority journal
; second harmonic generation microscopy
; static electricity
; stoichiometry
英文摘要: Ferroelectric perovskites present a switchable spontaneous polarization and are promising energy-efficient device components for digital information storage. Full control of the ferroelectric polarization in ultrathin films of ferroelectric perovskites needs to be achieved in order to apply this class of materials in modern devices. However, ferroelectricity itself is not well understood in this nanoscale form, where interface and surface effects become particularly relevant and where loss of net polarization is often observed. In this work, we show that the precise control of the structure of the top surface and bottom interface of the thin film is crucial toward this aim. We explore the properties of thin films of the prototypical ferroelectric lead titanate (PbTiO3) on a metallic strontium ruthenate (SrRuO3) buffer using a combination of computational (density functional theory) and experimental (optical second harmonic generation) methods. We find that the polarization direction and strength are influenced by chemical and electronic processes occurring at the epitaxial interface and at the surface. The polarization is particularly sensitive to adsorbates and to surface and interface defects. These results point to the possibility of controlling the polarization direction and magnitude by engineering specific interface and surface chemistries. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163366
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Gattinoni, C., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland; Strkalj, N., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland; Härdi, R., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland; Fiebig, M., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland; Trassin, M., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland; Spaldin, N.A., Department of Materials, ETH Zurich, Zurich, 8093, Switzerland
Recommended Citation:
Gattinoni C.,Strkalj N.,Härdi R.,et al. Interface and surface stabilization of the polarization in ferroelectric thin films[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(46)