期刊
NANO LETTERS
卷 12, 期 11, 页码 5524-5531出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl302382k
关键词
Domain wall conduction; PFM; phase-field modeling; c-AFM; ferroelectrics
类别
资金
- ARC
- Australian Nanotechnology Network
- NAS Ukraine
- Division of Scientific User Facilities, U.S. Department of Energy
- Department of Energy Basic Sciences [DOE DE-FG02-07ER46417]
- National Science Council, R.O.C [NSC-101-2119-M-009-003-MY2]
- Ministry of Education (MOE-ATU) [101W961]
- Center for interdisciplinary science of National Chiao Tung University
A new paradigm of domain wall. nanoelectronics has emerged recently, in which the domain wall in a ferroic is itself an active device element The ability to spatially. modulate the ferroic order parameter within a single domain wall allows the physical properties to be tailored at will and hence opens vastly unexplored device possibilities: Here, we demonstrate via ambient and ultrahigh-vacuum (UHV) scanning probe microscopy (SPM) measurements in bismuth ferrite that the conductivity of the domain walls can be modulated by up to 500% in the spatial dimension as a function of domain wall curvature. Landau-Ginzburg-Devonshire calculations reveal the conduction is a.. result of carriers or vacancies migrating to neutralize the charge at the farmed interface. Phase field modeling indicates that anisotropic potential distributions can occur even for initially uncharged walls, from polarization dynamics mediated by elastic effects. These results are the first proof of concept for modulation of charge as a function of domain wall geometry by a proximal probe, thereby expanding potential applications for oxide ferroics in future nanoscale electronics.
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