標題: | Enhanced electric conductivity at ferroelectric vortex cores in BiFeO3 |
作者: | Balke, Nina Winchester, Benjamin Ren, Wei Chu, Ying Hao Morozovska, Anna N. Eliseev, Eugene A. Huijben, Mark Vasudevan, Rama K. Maksymovych, Petro Britson, Jason Jesse, Stephen Kornev, Igor Ramesh, Ramamoorthy Bellaiche, Laurent 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: | 1-一月-2012 |
摘要: | Topological defects in ferroic materials are attracting much attention both as a playground of unique physical phenomena and for potential applications in reconfigurable electronic devices. Here, we explore electronic transport at artificially created ferroelectric vortices in BiFeO3 thin films. The creation of one-dimensional conductive channels activated at voltages as low as 1V is demonstrated. We study the electronic as well as the static and dynamic polarization structure of several topological defects using a combination of first-principles and phase-field modelling. The modelling predicts that the core structure can undergo a reversible transformation into a metastable twist structure, extending charged domain walls segments through the film thickness. The vortex core is therefore a dynamic conductor controlled by the coupled response of polarization and electron-mobile-vacancy subsystems with external bias. This controlled creation of conductive one-dimensional channels suggests a pathway for the design and implementation of integrated oxide electronic devices based on domain patterning. |
URI: | http://hdl.handle.net/11536/150430 |
ISSN: | 1745-2473 |
期刊: | NATURE PHYSICS |
Volume: | 8 |
起始頁: | 81 |
結束頁: | 88 |
顯示於類別: | 期刊論文 |