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Microscopic piezoelectric behavior of clamped and membrane (001) PMN-30PT thin films
- Source :
- APPLIED PHYSICS LETTERS
- Publication Year :
- 2021
-
Abstract
- Bulk single-crystal relaxor-ferroelectrics, like Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT), are widely known for their large piezoelectricity. This is attributed to polarization rotation which is facilitated by the presence of various crystal symmetries for compositions near a morphotropic phase boundary (MPB). Relaxor-ferroelectric thin films, which are necessary for low-voltage applications, suffer a reduction in their piezoelectric response due to clamping by the passive substrate. To understand the microscopic behavior of this adverse phenomenon, we employ AC electric field driven in-operando synchrotron x-ray diffraction (XRD) on patterned device structures to investigate the piezoelectric domain behavior under an electric field for both a clamped (001) PMN-PT thin film on Si and a (001) PMN-PT membrane released from its substrate. In the clamped film, the substrate inhibits the field induced rhombohedral (R) to tetragonal (T) phase transition resulting in a reversible R to Monoclinic (M) transition with a reduced longitudinal piezoelectric coefficient d33 < 100 pm/V. Releasing the film from the substrate results in recovery of the R to T transition and results in a d33 > 1000 pm/V. Using diffraction with spatial mapping, we find that lateral constraints imposed by the boundary between active and inactive material also inhibits the R to T transition. Phase-field calculations on both clamped and released PMN-PT thin films simulate our experimental findings. Resolving the suppression of thin film piezoelectric response is critical to their application in piezo-driven technologies.
- Subjects :
- Phase transition
Phase boundary
Condensed Matter - Materials Science
Piezoelectric coefficient
Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Substrate (electronics)
Piezoelectricity
Crystal
Electric field
Thin film
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- APPLIED PHYSICS LETTERS
- Accession number :
- edsair.doi.dedup.....95977b8992bcf425305f95259a78a5a7