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Analysis of domain structure and dynamics in tetragonal Lead Zirconate Titanate

Aukes, T.A. (2015) Analysis of domain structure and dynamics in tetragonal Lead Zirconate Titanate.

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Abstract:This research is about the domain structure and dynamics in tetragonal compositions of Lead Zirconate Titanate (PZT) epitaxial grown on Strontium Titanium Oxide (STO). PZT and a Strontium Ruthenate Oxide (SRO) bottom-electrode layer were grown on single terminated STO substrates using Pulsed Laser Deposition. To relax the misfit strain imposed by the STO substrate upon cooling down from deposition temperature, the PZT thin film forms a typical tetragonal a/c-domain structure. The PZT film was ferroelectrically switched using a thin metal top-electrode. Before and after switching, the domain structure was studied using di↵erent techniques like X-ray Di↵raction (XRD), Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM). The TEM indicated the presence of the a/c-domain structure and confirmed the expected relation between the surface height profile and the underlying domain structure. The height profile is used to map the domain structure with an AFM setup. In both XRD and AFM analysis a reconfiguration of the domain structure is observed, thereby indicating movement of the domains. In XRD it is observed that the structural changes relax back to it’s as-grown state. A di↵erent behavior is observed for di↵erent tetragonal compositions of the PZT, which is likely to arise from the di↵erence in tetragonality between both compositions.
Item Type:Essay (Master)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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