標題: Unraveling Deterministic Mesoscopic Polarization Switching Mechanisms: Spatially Resolved Studies of a Tilt Grain Boundary in Bismuth Ferrite
作者: Rodriguez, Brian J.
Choudhury, Samrat
Chu, Y. H.
Bhattacharyya, Abhishek
Jesse, Stephen
Seal, Katyayani
Baddorf, Arthur P.
Ramesh, R.
Chen, Long-Qing
Kalinin, Sergei V.
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 10-七月-2009
摘要: The deterministic mesoscopic mechanism of ferroelectric domain nucleation is probed at a single atomically-defined model defect: an artificially fabricated bicrystal grain boundary (GB) in an epitaxial bismuth ferrite film. Switching spectroscopy piezoresponse force microscopy (SS-PFM) is used to map the variation of local hysteresis loops at the GB and in its immediate vicinity. It is found that the the influence of the GB on nucleation results in a slight shift of the negative nucleation bias to larger voltages. The mesoscopic mechanisms of domain nucleation in the bulk and at the GB are studied in detail using phase-field modeling, elucidating the complex mechanisms governed by the interplay between ferroelectric and ferroelastic wall energies, depolarization fields, and interface charge. The combination of phase-field modeling and SS-PFM allows quantitative analysis of the mesoscopic mechanisms for polarization switching, and hence suggests a route for unraveling the mechanisms of polarization switching at a single defect level and ultimately optimizing materials properties through microstructure engineering.
URI: http://dx.doi.org/10.1002/adfm.200900100
http://hdl.handle.net/11536/6967
ISSN: 1616-301X
DOI: 10.1002/adfm.200900100
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 19
Issue: 13
起始頁: 2053
結束頁: 2063
顯示於類別:期刊論文


文件中的檔案:

  1. 000268297800004.pdf