Dresden 2017 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 11: Ferroics - Domains, Domain Walls and Skyrmions II

DF 11.1: Topical Talk

Wednesday, March 22, 2017, 09:30–10:00, WIL B321

Implications of domain evolution during the growth of ferroelectric superlattices — Rui Liu, Benjamin Bein, Hsiang-Chun Hsing, Anna Gura, Mohammed Humed Yusuf, Giulia Bertino, Jin-Wen Lai, and •Matthew Dawber — Dept of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA

In ferroelectric superlattices the constituent materials are often under considerable epitaxial strain, raising their ferroelectric transition temperatures to the point where they are comparable to or exceed the growth temperature. This has a number of important consequences for the growth of the superlattice and it's eventual properties. For example, the polarization domain structure is markedly different depending on whether the overall structure's transition temperature lies constantly below, constantly above, or oscillates around the growth temperature. Perhaps more surprisingly, we have found that the ferroelectric polarization of a growing structure has a strong effect on the rate at which it grows, which is critical information if high quality samples with well defined layer thicknesses are to be achieved. A useful approach to investigating these questions is x-ray diffraction performed in-situ during the growth process. The precise control of both layer thicknesses and the arrangement of polarization domains are particularly important for applications of ferroelectric materials that rely on their polar surface structure, such as photocatalysis or the nanoscale control of the charge state of 2D materials.