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FM: Fachverband Funktionsmaterialien

FM 12: German-French Focus Session: Materials Research in Polar Oxides – From Domain Engineering to Photonic and Electronic Devices I

FM 12.1: Hauptvortrag

Mittwoch, 11. März 2026, 09:30–10:00, BEY/0138

Shedding Light on Polar Topological Textures — •Salia Cherifi-Hertel — CNRS and University of Strasbourg, IPCMS

The study of topological polarization textures in ferroelectric materials represents a rapidly evolving frontier in ferroic research, with implications for solitonic information technologies and emergent phenomena in correlated oxides. Complex configurations, such as non-Ising and chiral domain walls, bubble domains, (anti)vortices, and polar (anti)skyrmions, highlight the diversity of polarization states in low-dimensional systems, where symmetry breaking, strain, and electrostatic boundary conditions produce novel functionalities. While piezoresponse force and transmission electron microscopies remain central to nanoscale characterization, optical methods are emerging as powerful, noninvasive alternatives. Second-harmonic generation (SHG) microscopy, in particular, provides intrinsic sensitivity to symmetry and polarization orientation, enabling three-dimensional mapping of polar architectures. This presentation will outline recent advances in SHG polarimetry combined with machine-learning-assisted analysis, enabling rapid, quantitative reconstruction of 3D polarization textures. This integrated approach offers a robust framework for probing polar topologies and uncovering the intricate coupling between structure, symmetry, and functionality in ferroic materials.

Keywords: Ferroelectrics; Domain Walls; Polarization Texture; Chirality