Chen, Yi-Chun

Chu, Ying-Hao

Jesse, Stephen

Kalinin, Sergei V.

Kumar, Amit

Li, Jiangyu

Liang, Wen-I

Liu, Yunya

Nagarajan, Valanoor

Vasudevan, Rama K.

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 -&gt; R transition is activated at lower voltages compared to T -&gt; - 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.</p

Queen's University Belfast Research Portal

Nanoscale Control of Phase Variants in Strain-Engineered BiFeO3

Nanoscale Control of Phase Variants in Strain-Engineered BiFeO3

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Queen's University Belfast Research Portal