標題: Nanoscale Control of Phase Variants in Strain-Engineered BiFeO3
作者: Vasudevan, Rama K.
Liu, Yunya
Li, Jiangyu
Liang, Wen-I
Kumar, Amit
Jesse, Stephen
Chen, Yi-Chun
Chu, Ying-Hao
Nagarajan, Valanoor
Kalinin, Sergei V.
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Bismuth ferrite;mixed phase;cantilever resonance tracking;PFM
公開日期: 1-Aug-2011
摘要: Development of magnetoelectric, electromechanical, and photovoltaic devices based on mixed-phase rhombohedral-tetragonal (R-T) BiFeO3 (BFO) systems is possible only if the control of the engineered R phase variants is realized. Accordingly, we explore the mechanism of a bias induced phase transformation in this system. Single point spectroscopy demonstrates that the T -> R transition is activated at lower voltages compared to T -> - T polarization switching. With phase field modeling, the transition is shown to be electrically driven. We further demonstrate that symmetry of formed R-phase rosettes can be broken by a proximal probe motion, allowing controlled creation of R variants with defined orientation. This approach opens a pathway to designing next-generation magnetoelectronic and data storage devices in the nanoscale.
URI: http://dx.doi.org/10.1021/nl201719w
http://hdl.handle.net/11536/150351
ISSN: 1530-6984
DOI: 10.1021/nl201719w
期刊: NANO LETTERS
Volume: 11
起始頁: 3346
結束頁: 3354
Appears in Collections:Articles