1. Polarization description of successive ferroelectric switching in hafnia
- Author
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Zhao, Guo-Dong, Liu, Xingen, Xu, Zhongshan, Ren, Wei, Zhu, Xiaona, Zhang, David Wei, and Yu, Shaofeng
- Subjects
Condensed Matter - Materials Science - Abstract
Intertwined ionic conduction and ferroelectric (FE) switching in HfO2 lead to extensive focuses. To describe its fundamental phenomena, we present a free-energy model describing the potential of ferroelectrics with successive FE switching paths, and extend the domain model of ionic conduction to ferroelectric domains. Associate theoretical analyses and first-principles calculations suggest a nesting-domain pattern with opposite piezoelectric loops during the nucleation-and-growth process in displacive FE-HfO2. A collective oxygen ion conduction mechanism is also proposed with a field-dependent ionic conductivity following the Merz's law. We conclude that the ionic conductibility is concomitant with the ferroelectricity in HfO2, and it may provide a new venue for pursuing low temperature fast oxide-ion conductors and artificial synapses., Comment: 26 pages
- Published
- 2023