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Reducing Coercive-Field Scaling in Ferroelectric Thin Films via Orientation Control
Ruijuan Xu1, Ran Gao1, Sebastian E Reyes-Lillo2,3,4
1Department of Materials Science and Engineering , University of California , Berkeley , California 94720 , United States.
ACS Nano
|April 12, 2018
Summary
Ferroelectric thin films show altered scaling laws at smaller sizes. (111)-oriented films transition to a monoclinic phase, deviating from the expected Janovec-Kay-Dunn scaling due to structural changes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Low-power electronic devices require understanding scaling effects in ferroelectric thin films.
- The Janovec-Kay-Dunn (JKD) law describes the relationship between coercive field (Ec) and thickness (d) as Ec ∝ d⁻²/³.
Purpose of the Study:
- To investigate the scaling behavior of ferroelectric thin films, specifically PbZr₀.₂Ti₀.₈O₃ (PTO).
- To understand deviations from the JKD law in different crystallographic orientations.
Main Methods:
- Fabrication of (001)- and (111)-oriented PTO heterostructures.
- X-ray diffraction (XRD) for structural analysis.
- First-principles calculations to model energy barriers and phase transitions.
Main Results:
- (001)-oriented films followed JKD scaling, remaining tetragonal.
- (111)-oriented films deviated from JKD scaling below 165 nm due to a tetragonal-to-monoclinic symmetry transition.
- This transition, driven by compressive strain, reduced the energy barrier for switching and remanent polarization.
Conclusions:
- Structural evolution in ferroelectric thin films can lead to deviations from established scaling laws.
- The monoclinic phase in (111)-oriented PTO films provides a mechanism for reducing coercive fields.
- This research offers insights into controlling ferroelectric properties for device applications.
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