SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Non-Skyrmionic Magnetic Textures I
MA 11.1: Vortrag
Montag, 27. März 2023, 15:00–15:15, POT 6
Topological defects in a multiferroic antiferromagnet — •Aurore Finco1, Angela Haykal1, Stéphane Fusil2, Pawan Kumar1, Pauline Dufour2, Anne Forget3, Dorothée Colson3, Jean-Yves Chauleau3, Michel Viret3, Nicolas Jaouen4, Vincent Garcia2, and Vincent Jacques1 — 1Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France — 2Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, Palaiseau, France — 3SPEC, CEA, CNRS, Université Paris-Saclay, Gif sur Yvette, France — 4Synchrotron SOLEIL, Gif-sur-Yvette, France
We report on the formation of topological defects emerging from the cycloidal order at the surface of bulk BiFeO3 crystals [1]. Combining reciprocal and real-space magnetic imaging techniques, we first observe, in a single ferroelectric domain, the coexistence of regions in which the antiferromagnetic cycloid propagates along different wave vectors. We then show that the direction of these wave vectors is not strictly locked to the preferred crystallographic axes but rather rotates continuously. At the junctions between the magnetic domains, we observe topological line defects identical to those found in a broad variety of lamellar physical systems with rotational symmetries. Our work establishes the presence of these magnetic objects at room temperature in the multiferroic antiferromagnet BiFeO3, offering new opportunities in terms of robustness and electrical control towards their use in spintronic devices.
[1] Finco et al, Phys. Rev. Lett. 128, 187201 (2022)