期刊
APPLIED PHYSICS LETTERS
卷 118, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/5.0040512
关键词
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资金
- Fundamental Research Funds for the Central Universities [G2018KY0305, G2020KY0501]
- National Key Research and Development Program of China [2019YFA0307900]
- Beijing Natural Science Foundation [Z190011]
- Beijing Institute of Technology Research Fund Program for Young Scholars
- DOE [DE-FG02-07ER46382]
By creatively adopting an inclined polishing process, the study revealed the presence of large-scale CDWs in ferroelectric manganites, offering a new potential for the design of nano-devices.
A ferroelectric charged domain wall (CDW) carries bound charges, originating from the variation of the normal components of polarization across the domain boundary, leading to a possible two-dimensional conductive interface in insulating materials. The ferroelectric CDW can be precisely created, erased, and manipulated, therefore offering an intriguing pathway toward the design of nano-devices. However, due to rather large energy costs, the size of the CDW is usually on the nanoscale. Here, taking flux-grown ferroelectric hexagonal manganites (h-RMnO3) as an example, we creatively adopted an accessible inclined polishing process to reveal the domain evolution of stripe, loop, and vortex domain patterns by depth profiling. Interestingly, we observed an unexpected large-scale straight CDW in as-grown LuMnO3 with length up to a millimeter size, which may result from the polar catastrophe during the flux growth. The large-scale CDW has a residual influence on the formation of the loop domain when the crystal anneals below the ferroelectric transition temperature, but completely disappears as the topological vortices emerge. The observed large-scale CDWs make h-RMnO3 a potential candidate for advanced electronic devices, leading to a panoply of desired properties.
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