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MA: Fachverband Magnetismus

MA 8: INNOMAG e.V. Prizes 2024 (Diplom-/Master and Ph.D. Thesis)

MA 8.5: Vortrag

Montag, 18. März 2024, 16:40–17:05, H 1058

Spin waves in curved magnetic shells — •Lukas Körber — HZDR, Dresden, Germany — TU Dresden, Germany

Exploring 3D systems has attracted several research fields, including the study of ferromagnets and superconductors. Given the underlying order parameter and interactions, twisting and bending flat into curved shells leads to emerging effects when the bending radius approaches the system's internal length scales. Curvature-induced anisotropies and magnetochiral interactions have been widely studied in ferromagnetic systems, uncovering the stabilization of solitons, pinning of domain walls, or suppression of the Walker breakdown.

The impact of curvature and geometry on low-energy magnetization dynamics (the propagation of spin waves) manifests in several aspects. For example, curvature can modify dynamic magnetic charges. As a result, magneto-chiral symmetry breaking of magnetostatic origin can lead to asymmetric spin-wave dispersion, nonreciprocal spatial mode profiles and strongly modify nonlinear magnetization dynamics. Moreover, a nontrivial topology of three-dimensional magnetic specimens can induce a Berry phase of spin waves or impose selection rules on the dynamics of magnetic textures. Furthermore, achiral symmetry breaking, induced, e.g., by lowering rotational symmetries, can lead to symmetry-governed doublet splitting. Here, we explore several of the aforementioned geometrical effects on magnetization dynamics and present the development of noval numerical techniques to study spin waves in curved magnetic shells efficiently.

Keywords: spin waves; curvature; micromagnetism; dynamic-matrix methods; continuum theory