期刊
NATURE MATERIALS
卷 11, 期 8, 页码 700-709出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat3371
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资金
- US Department of Energy, Division of Materials Sciences and Division of Chemical Sciences [DE-AC02-05CH11231, DE-AC02-98CH10886]
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-06CH11357]
- National Science Foundation [NSF-MSN CAREER-1157300, EPS-1003897, NSF-DMR-1004869]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1157300] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [1003897] Funding Source: National Science Foundation
Ferroelectricity in finite-dimensional systems continues to arouse interest, motivated by predictions of vortex polarization states and the utility of ferroelectric nanomaterials in memory devices, actuators and other applications. Critical to these areas of research are the nanoscale polarization structure and scaling limit of ferroelectric order, which are determined here in individual nanocrystals comprising a single ferroelectric domain. Maps of ferroelectric structural distortions obtained from aberration-corrected transmission electron microscopy, combined with holographic polarization imaging, indicate the persistence of a linearly ordered and monodomain polarization state at nanometre dimensions. Room-temperature polarization switching is demonstrated down to similar to 5 nm dimensions. Ferroelectric coherence is facilitated in part by control of particle morphology, which along with electrostatic boundary conditions is found to determine the spatial extent of cooperative ferroelectric distortions. This work points the way to multi-Tbit/in(2) memories and provides a glimpse of the structural and electrical manifestations of ferroelectricity down to its ultimate limits.
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