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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 2: Focus Session: Defects and Interfaces in Multiferroics 1

KFM 2.1: Hauptvortrag

Montag, 5. September 2022, 09:30–10:00, H5

Domain-wall engineering in multiferroic materials — •Guillaume Nataf — GREMAN UMR7347, CNRS, University of Tours, INSA Centre Val de Loire, 37000 Tours, France

Ferroelectric and ferroelastic domain walls are two-dimensional topological defects with thicknesses approaching the unit cell level that can move in response to an electric-field or an applied stress. They exhibit emergent functional properties, such as polarity in non-polar systems or electrical conductivity in otherwise insulating materials, and due their complex strain profiles they interact with phonons as 'defects' would.

In this talk I will: (1) Show how to characterize domain walls with optical techniques (polarized light optical microscopy, liquid crystal decoration, Raman spectroscopy); (2) Discuss how domain walls move in response to an electric field or an applied stress, through discrete impulsive jumps, indicators of avalanches on a broad range of scales; (3) Show that domain walls can be used to induce large thermal conductivity variations in materials.