Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Non-Skyrmionic Magnetic Textures
MA 37.1: Vortrag
Mittwoch, 11. März 2026, 15:00–15:15, POT/0351
Regularized micromagnetic theory for Bloch points — •Vladyslav M. Kuchkin1, Andreas Haller1, Andreas Michels1, Thomas L. Schmidt1, and Nikolai S. Kiselev2 — 1Department of Physics and Materials Science, University of Luxembourg — 2Peter Grünberg Institute, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
Magnetic singularities, known as Bloch points, pose a significant challenge for the micromagnetic theory due to the divergence of the effective field at these points. In this talk, we present a recently developed regularized micromagnetic model that does not assume a fixed magnetization length, but treats magnetization as an order parameter on the S3 sphere, thus allowing it to vary in length from zero up to a threshold value. Such an extension of micromagnetics respects the fundamental properties of local spin expectation values in quantum systems. Relying on the S3 order parameter, we derive Landau-Lifshitz-Gilbert and Thiele equations and apply them to the dynamics of several spin textures: domain walls in nanowires, chiral bobbers, and magnetic dipole strings. The results demonstrate how the extended formalism accounts for the dynamics of Bloch points observed experimentally and open up prospects for modeling complex spin structures, including the nucleation and annihilation of topological states such as skyrmions and hopfions.
Keywords: Bloch points; Chiral bobber; Dipole strings; Regularized micromagnetism; S3-model