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MA: Fachverband Magnetismus
MA 30: Skyrmions II
MA 30.10: Vortrag
Mittwoch, 20. März 2024, 17:45–18:00, EB 301
Skyrmions and Hopfions: topological chirality emerging from dipole-dipole interactions — •Svitlana Kondovych1 and Igor Luk'yanchuk2 — 1Institute for Theoretical Solid State Physics, IFW Dresden, 01069 Dresden, Germany — 2Laboratory of Condensed Matter Physics, University of Picardie, 80039 Amiens, France
Confined ferroics display non-uniform vector field texturing, driven by the interplay of dipole-dipole interactions, elastic strains, anisotropic energy, and confinement effects. Topologically non-trivial, chirality-endowed structures like Bloch domain walls, merons, skyrmions, and Hopfions attract attention for their fundamental importance and diverse applications. In magnetic [1-3] and ferroelectric [4,5] materials, chirality spontaneously emerges to minimize stray fields, even without the local, Dzyaloshinskii-Moriya-like antisymmetric exchange.
We present a theoretical framework to elucidate the role of dipole-dipole interactions in formation of chiral topological states in nanosized ferroic structures. Through various examples, we illustrate non-uniform confined vector fields, highlighting the possibility to tailor and manipulate their swirling and handedness.
S.K. acknowledges the support from the Alexander von Humboldt Foundation.
[1] E. Berganza, et al., Sci. Rep. 12, 3426 (2022).
[2] F. Büttner, et al., Sci. Rep. 8, 1-12 (2018).
[3] J. Schöpf, et al. Nano Letters 23.8, 3532-3539 (2023).
[4] I. Lukyanchuk, et al., Nat. Commun. 11, 2433 (2020).
[5] Y. Tikhonov, et al., Sci. Rep. 10, 8657 (2020).
Keywords: ferroics; chirality; dipole-dipole interactions; skyrmion; Hopfion