Direct observation of asymmetric domain wall motion in a ferroelectric capacitor
| Autor: | Long Qing Chen, Jason Britson, Ho Nyung Lee, Ja Kyung Lee, Woo Seok Choi, Ye Cao, Ga Young Shin, Sang Ho Oh, Yoon Ah Shin, Seongyong Park, Kyung Song |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Polymers and Plastics Condensed matter physics business.industry media_common.quotation_subject Metals and Alloys Nucleation Ferroelectricity Asymmetry Ferroelectric capacitor Electronic Optical and Magnetic Materials law.invention Capacitor Optics law Electric field Electrode Ceramics and Composites Polarization (electrochemistry) business media_common |
| Zdroj: | Acta Materialia. 61:6765-6777 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2013.07.051 |
| Popis: | We report in situ transmission electron microscopy observations of the 180° polarization switching process of a PbZr0.2Ti0.8O3 (PZT) capacitor. The preferential, but asymmetric, nucleation and forward growth of switched c-domains were observed at the PZT/electrode interfaces, arising due to the built-in electric field induced at each interface. The subsequent sideways growth of the switched domains was inhibited by the depolarization field due to the imperfect charge compensation at the counter-electrode and also at the boundaries with preexisting a-domains, which contributed further to the asymmetric switching behavior. It was found that the preexisting a-domains split into fine a- and c-domains constituting a 90° stripe domain pattern during the 180° polarization switching process, revealing that these domains also actively participated in the out-of-plane polarization switching. The real-time observations uncovered the origin of the switching asymmetry and further clarified the importance of charged domain walls and the interfaces with electrodes in the ferroelectric switching processes. |
| Databáze: | OpenAIRE |
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