Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 3: Magnonics I

MA 3.6: Talk

Monday, March 17, 2025, 10:45–11:00, H18

Exotic Magnon Spectra from Strong Dipolar Interactions and Anisotropy — •Konrad Scharff — KIT, Karlsruhe, Deutschland

Magnetic dipole-dipole interactions on lattices have been known to be the source of non-analytical behaviour of associated spin wave dispersions at and around the Brillouin zone center [1,2]. We investigate the consequences and predicted signatures of said non-analyticity in a 3D hexagonal lattice model that additionally hosts magnetic exchange interaction, as well as an easy-plane on-site anisotropy. Dynamical susceptibilities are theoretically evaluated and compared to available experimental data.

[1] Jensen, J. and Mackintosh, A.R. Rare Earth Magnetism. Clarendon Press - Oxford (1991)

[2] Baehr, M. et al. Effect of magnetic dipolar interactions on the interchain spin-wave dispersion in CsNiF3. Phys. Rev B 54, 12932 (1996)

Keywords: 4f Electron Systems; Dipolar Interactions