title: Unique nano-domain structures in self-assembled BiFeO₃ and Pb(Zr,Ti)O₃ ferroelectric nanocapacitors.
abstract: In this work, self-assembled ferroelectric BiFeO3 (BFO) and Pb(Zr,Ti)O3 (PZT) nanocapacitors were fabricated by a one-step pulsed-laser deposition process. Each individual nanocapacitor consists of a SrRuO3 or LaSrMnO3 bottom electrode layer, an epitaxial ferroelectric middle layer and a self-assembled nanoisland of conductive Bi2O3 or PbO2 as the top nanoelectrode. The nanoelectrodes have a lateral size of 10-100 nm depending on various deposition equivalent thickness. The as-fabricated nanocapacitors exhibit unique so-called anti-domain structures, with opposite polarization orientation to that of the naked ferroelectric films, which can be understood by the different interface built-in-voltages between their neighboring layers. They also show apparent reduced coercive fields and enhanced piezoelectricity compared to the naked films, as revealed by the switching spectroscopy piezoresponse force microscopy (SSPFM) and band-excitation mapping. Besides that, individual addressable polarization writing and erasing properties were also observed in these nanocapacitors and the written domain can maintain stability up to 12 h, which is promising for data storage devices.
authors.affiliation: Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, People's Republic of China.
authors.forename: Fengyuan
authors.initials: F
authors.lastname: Zhang
authors.forename: Qing
authors.initials: Q
authors.lastname: Miao
authors.forename: Guo
authors.initials: G
authors.lastname: Tian
authors.forename: Zengxing
authors.initials: Z
authors.lastname: Lu
authors.forename: Lina
authors.initials: L
authors.lastname: Zhao
authors.forename: Hua
authors.initials: H
authors.lastname: Fan
authors.forename: Xiao
authors.initials: X
authors.lastname: Song
authors.forename: Zhongwen
authors.initials: Z
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Zeng
authors.forename: Xingsen
authors.initials: X
authors.lastname: Gao
authors.forename: Junming
authors.initials: J
authors.lastname: Liu