Journal
ADVANCED MATERIALS
Volume 29, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201701475
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Funding
- Department of Energy (DOE), Office of Basic Energy Sciences (BES), Division of Materials Science and Engineering [DE-SC0014430]
- National Basic Research Program of China [2015CB654901]
- National Natural Science Foundation of China [51302132, 11474147]
- DOE/BES, Division of Materials Science and Engineering [DE-FG02-07ER46417]
- NSF [DMR-1210588]
- NSF MRSEC [DMR-1420620]
- DOE/BES, Division of Materials Sciences and Engineering [DE-SC0002334]
- National Center for Electron Microscopy at Lawrence Berkeley National Laboratory under DOE [DE-AC02-05CH11231]
- National Science Foundation [ECCS-0335765]
- National Energy Research Scientific Computing Center, a DOE Office of Science User Facility [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210588] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0002334] Funding Source: U.S. Department of Energy (DOE)
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Tailoring and enhancing the functional properties of materials at reduced dimension is critical for continuous advancement of modern electronic devices. Here, the discovery of local surface induced giant spontaneous polarization in ultrathin BiFeO3 ferroelectric films is reported. Using aberration- corrected scanning transmission electron microscopy, it is found that the spontaneous polarization in a 2 nm-thick ultrathin BiFeO3 film is abnormally increased up to approximate to 90-100 mu C cm(-2) in the out-of-plane direction and a peculiar rumpled nanodomain structure with very large variation in c/a ratios, which is analogous to morphotropic phase boundaries (MPBs), is formed. By a combination of density functional theory and phase-field calculations, it is shown that it is the unique single atomic Bi2O3-x layer at the surface that leads to the enhanced polarization and appearance of the MPB-like nanodomain structure. This finding clearly demonstrates a novel route to the enhanced functional properties in the material system with reduced dimension via engineering the surface boundary conditions.
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