Document Type
Article
Publication Date
5-2022
Keywords
Polarization domains; Applied electric field by AFM tip; Merz's law
Abstract
Piezoresponse force microscopy is used to study the velocity of the polarization domain wall in ultrathin ferroelectric barium titanate (BTO) films grown on strontium titanate (STO) substrates by molecular beam epitaxy. The electric field due to the cone of the atomic force microscope tip is demonstrated as the dominant electric field for domain expansion in thin films at lateral distances greater than about one tip diameter away from the tip. The velocity of the domain wall under the applied electric field by the tip in BTO for thin films (less than 40 nm) followed an expanding process given by Merz's law. The material constants in a fit of the data to Merz's law for very thin films are reported as about 4.2 KV/cm for the activation field, Ea, and 0.05 nm/s for the limiting velocity, v∞. These material constants showed a dependence on the level of strain in the films, but no fundamental dependence on thickness.
Citation
Zamani-Alavijeh, M., Morgan, T. A., Kuchuk, A. V., & Salamo, G. J. (2022). The Growth of Polarization Domains in Ultrathin Ferroelectric Films Seeded by the Tip of an Atomic Force Microscope. Nano Express, 17 (1), 52. https://doi.org/10.1186/s11671-022-03688-2
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
