期刊
NANO LETTERS
卷 12, 期 6, 页码 2846-2851出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3003717
关键词
Ferroelectric domains; oxide superlattices; electrostatic coupling; electron energy loss spectroscopy
类别
资金
- Swiss National Science Foundation through the NCCR MaNEP and division II
- EU [026019 ESTEEM]
- Spanish Ministry of Science and Innovation through the MICINN [FIS2009-12721-C04-02]
- Spanish Ministry of Education through the FPU [AP2006-02958]
- Spanish Ministry of Education and Science through the MEC [EX2009-0156]
The performance of ferroelectric devices is intimately entwined with the structure and dynamics of ferroelectric domains. In ultrathin ferroelectrics, ordered nanodomains arise naturally in response to the presence of a depolarizing field and give rise to highly inhomogeneous polarization and structural profiles. Ferroelectric superlattices offer a unique way of engineering the desired nanodomain structure by modifying the strength of the electrostatic interactions between different ferroelectric layers. Through a combination of X-ray diffraction, transmission electron microscopy, and first-principles calculations, the electrostatic coupling between ferroelectric layers is studied, revealing the existence of interfacial layers of reduced tetragonality attributed to inhomogeneous strain and polarization profiles associated with the domain structure.
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