High Velocity, Low‐Voltage Collective In‐Plane Switching in (100) BaTiO3 Thin Films
Abstract
Ferroelectrics are being increasingly called upon for electronic devices in extreme environments. Device performance and energy efficiency is highly correlated to clock frequency, operational voltage, and resistive loss. To increase performance it is common to engineer ferroelectric domain structure with highly‐correlated electrical and elastic coupling that elicit fast and efficient collective switching. Designing domain structures with advantageous properties is difficult because the mechanisms involved in collective switching are poorly understood and difficult to investigate. Collective switching is a hierarchical process where the nano‐ and mesoscale responses control the macroscopic properties. Using chemical solution synthesis, epitaxially nearly‐relaxed (100) BaTiO3 films are synthesized. Thermal strain induces a strongly‐correlated domain structure with alternating domains of polarization along the [010] and [001] in‐plane axes and 90° domain walls along the [011] or [01] directions. Simultaneous capacitance–voltage measurements and band‐excitation piezoresponse force microscopy revealed strong collective switching behavior. Using a deep convolutional autoencoder, hierarchical switching is automatically tracked and the switching pathway is identified. The collective switching velocities are calculated to be ≈500 cm s−1 at 5 V (7 kV cm−1), orders‐of‐magnitude faster than expected. These combinations of properties are promising for high‐speed tunable dielectrics and low‐voltage ferroelectric memories and logic.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 28, 2022
- Source ID
- 10.1002/advs.202201530
Entities
People
- Joshua C Agar
- Michael J. Zachman
- Rama K. Vasudevan
- Shuyu Qin
- Tor Grande
- Trygve M. Ræder
Organizations
- Army Research Office
- Drexel University
- Lehigh University
- National Science Foundation Directorate for Mathematical & Physical Sciences
- Norwegian University of Science and Technology
- Oak Ridge National Laboratory
- Office of Science
- Research Council of Norway
- Technical University of Denmark
- United States Department of Energy