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-Jan-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
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