Our research is focused around three-dimensional, in situ visualization of the emergent behavior that is seen in patterned functional nanostructures and heterostructures as their dimensions are reduced to the nanoscale. We strive to understand the complex energy landscape in heterostructure nanosystems whose building blocks show resistance switching, ferroelectric, ferromagnetic, and superconducting properties.
Our aim is to obtain a fundamental understanding of domain behavior and charge transport properties in these nanostructures through control of the parameters that contribute to their energy landscape, such as interlayer coupling, geometric effects that lead to anisotropy, and the interaction between adjacent nanostructures. A variety of methods can be used to probe emergent behavior on a global scale, but in nanoscale materials it is essential to be able to probe the local behavior, which can best be done through direct imaging as a function of external stimuli such as applied fields, temperature, and/or time.
Our multi-modal approach involves an interwoven combination of aberration-corrected Lorentz transmission electron microscopy (ALTEM) and advanced scanning force microscopy to solving scientific questions related to the behavior of ferroic nanostructures. A particular focus of our effort will be on the use of three-dimensional analysis and imaging techniques that we have developed to visualize domain and transport behavior in nanostructures.
- YoonYoung Choi (Supervisor, Seungbum Hong)
- Woon Ik Park (Supervisor, Seungbum Hong)
- Sheng Zhang (Supervisor, Charudatta Phatak)