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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: Ferroics - Domains and Domain Walls (joint session KFM/MA)

KFM 11.8: Vortrag

Mittwoch, 18. März 2020, 17:40–18:00, TOE 317

Tracing domain formation in ferroelectric PZT films in-situ — •Martin Sarott, Manfred Fiebig, and Morgan Trassin — Department of Materials, ETH Zurich, Switzerland

The pronounced impact of growth conditions on the formation of domains in ferroelectric thin films obstructs the effective design of devices based on ferroelectrics that require controlled polarization states and deterministic switching dynamics. Here, we overcome this notorious difficulty by tracking in-situ, during growth, the emergence of domains in ultrathin ferroelectric layers. We use a combination of in-situ optical second harmonic generation (ISHG) and reflection high energy electron diffraction to directly observe the formation of in-plane oriented a-domains in an otherwise c-domain matrix in technologically relevant PZT films. By monitoring ISHG, we correlate the signal to the domain structure and identify a signature of mixed in-plane/out-of-plane domain patterns. Furthermore, we reveal the impact of epitaxial strain on the emergence of a-domains in a c-domain matrix. Our in-situ approach allows us to disentangle the influence of various growth parameters on the domain structure and thus enables the design of thin films with predefined domain states for reliable ferroelectric properties in the ultrathin regime.