Ferroelectric Domain Walls

Statics, Dynamics, and Functionalities Revealed by Atomic Force Microscopy
Softcover Nachdruck of the original 1. Auflage 2014
ISBN: 978-3-319-38277-7
Verlag: Springer International Publishing

Buch, Englisch, 159 Seiten, Paperback, Format (B × H): 155 mm x 235 mm, Gewicht: 2759 g

Reihe: Springer Theses

Using the nano metric resolution of atomic force microscopy techniques, this work explores the rich fundamental physics and novel functionalities of domain walls in ferroelectric materials, the nano scale interfaces separating regions of differently oriented spontaneous polarization. Due to the local symmetry-breaking caused by the change in polarization, domain walls are found to possess an unexpected lateral piezoelectric response, even when this is symmetry-forbidden in the parent material. This has interesting potential applications in electromechanical devices based on ferroelectric domain patterning. Moreover, electrical conduction is shown to arise at domain walls in otherwise insulating lead zirconate titanate, the first such observation outside of multiferroic bismuth ferrite, due to the tendency of the walls to localize defects. The role of defects is then explored in the theoretical framework of disordered elastic interfaces possessing a characteristic roughness scaling and complex dynamic response. It is shown that the heterogeneous disorder landscape in ferroelectric thin films leads to a breakdown of the usual self-affine roughness, possibly related to strong pinning at individual defects. Finally, the roles of varying environmental conditions and defect densities in domain switching are explored and shown to be adequately modelled as a competition between screening effects and pinning.

Zielgruppe

Research

Autoren/Hrsg.

Guyonnet, Jill

Fachgebiete

• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde Materialwissenschaft: Elektronik, Optik
• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde Werkstoffkunde, Materialwissenschaft: Forschungsmethoden
• Naturwissenschaften Physik Thermodynamik Festkörperphysik, Kondensierte Materie
• Naturwissenschaften Physik Elektromagnetismus Mikroskopie, Spektroskopie

Inhaltsverzeichnis

Introduction.- Domain Walls in Ferroelectric Materials.- Experimental Setup.- Lateral Piezoelectric Response Across Ferroelectric Domain Walls.- Electrical Conduction at 180° Ferroelectric Domain Walls.- A Statistical Approach to Domain Wall Roughening and Dynamics: Disordered Elastic Systems.- Measuring the Roughness Exponent of One-Dimensional Interfaces.- Roughness Analysis of 180° Ferroelectric Domain Walls.- Disorder and Environmental Effects on Nanodomain Growth.- Conclusions.- Appendix A Displacement Autocorrelation Function Scaling for Super-Rough Interfaces.- Appendix B AFM for the Eye.