期刊
ADVANCED FUNCTIONAL MATERIALS
卷 20, 期 20, 页码 3466-3475出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201000475
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资金
- Division of Scientific User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy
- National Science Council, R.O.C. [NSC-98-2119-M-009-016]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy [DE-AC02-05CH1123]
Ferroelectric polarization switching in epitaxial (110) BiFeO3 films is studied using piezoresponse force microscopy of a model in-plane capacitor structure. The electrode orientation is chosen such that only two active domain variants exist. Studies of the kinetics of domain evolution allows clear visualization of nucleation sites, as well as forward and lateral growth stages of domain formation. It is found that the location of the reverse-domain nucleation is correlated with the direction of switching in a way that the polarization in the domains nucleated at an electrode is always directed away from it. The role of interface charge injection and surface screening charge on switching mechanisms is explored, and the nucleation is shown to be controllable by the bias history of the sample. Finally, the manipulation of domain nucleation through domain structure engineering is illustrated. These studies pave the way for the engineering and design of the ferroelectric device structures through control of individual steps of the switching process.
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