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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: (Multi)ferroic States: From Fundamentals to Applications (V)

KFM 11.1: Invited Talk

Wednesday, March 19, 2025, 09:30–10:00, H9

Towards 3D nanoscale chemical mapping with atom probe tomography — •Kasper Hunnestad, Constantinos Hatzoglou, Antonius van Helvoort, and Dennis Meier — Norwegian University of Science and Technology, Trondheim, Norway

The discovery of new physical phenomena in materials is closely linked to the progress in characterization, and is propelled by the ability to observe and study physical processes occurring at the atomic level. Nanoscale structural characterization has been a cornerstone for many discoveries related to ferroic phenomena. Chemical characterization at the atomic level, however, remains a major challenge.

In the first part of this talk, I will present how atom probe tomography (APT) can be incorporated into the toolkit of nanoscale research to study ferroic oxide materials. In the second part of this talk, a special emphasis will be put on various ferroic phenomena, such as ferroelectric domain walls and interface effects. The focus will be on understanding their chemical state and the role of defects in controlling their physical properties.

The presentation will demonstrate that correlations between defect chemistry and ferroic phenomena can be experimentally probed with nanoscale spatial resolution using APT, opening an avenue to obtain a deeper understanding of ferroic materials.

Keywords: Atom probe tomography; Ferroelectric; Defect; Domain wall