期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.047601
关键词
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资金
- Swiss COST office [C10.0089]
- Oak Ridge National Laboratory's SHaRE User Facility
- Office of Basic Energy Sciences, U.S. Department of Energy
- the Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy [DE-FG02-09ER46554]
- McMinn Endowment
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
We determine the atomic structure of the pseudotetragonal T phase and the pseudorhombohedral R phase in highly strained multiferroic BiFeO3 thin films by using a combination of atomic-resolution scanning transmission electron microscopy and electron energy-loss spectroscopy. The coordination of the Fe atoms and their displacement relative to the O and Bi positions are assessed by direct imaging. These observations allow us to interpret the electronic structure data derived from electron energy-loss spectroscopy and provide evidence for the giant spontaneous polarization in strained BiFeO3 thin films.
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