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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 13: Focus Session: (Multi-)Ferroic States III

KFM 13.1: Talk

Wednesday, March 20, 2024, 09:30–10:00, EMH 225

What can we expect from multiferroic antiskyrmions? — •Jiri Hlinka — Institute of Physics, Czech Acad. Sci., Prague, Czechia

The prediction and experimental confirmation of magnetic skyrmions - the objects with nontrivial swirling spins patterns - revolutionized the physics of nanoscale magnetism and opened new horizons for spintronics. In spite of the inherently shorter and faster correlations of the electric polarization, the recent developments in electric skyrmionics follow these innovations. Our recent work with M. Goncalves and M. Pasciak[arXiv:2303.07389] reveals that classical ferroelectric perovskite - barium titanate - can host 2-3 nm wide polar columns spontaneously surrounded by a unique noncollinear polarization pattern that has never been described before. Based on the reference-frame-invariant topological charge of this topological defect, we name it *ferroelectric antiskyrmion*. In this contribution we shall address the question about the existence and properties od whether similar topological defects can exist in multiferroic materials like bismuth ferrite.

Keywords: bismuth ferrite; multiferroics; antiskyrmion