Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnonics I
MA 3.6: Vortrag
Montag, 17. März 2025, 10:45–11:00, H18
Exotic Magnon Spectra from Strong Dipolar Interactions and Anisotropy — Michal Stekiel1, Christoph Resch2, •Konrad Scharff3, Markus Garst3, and Christian Pfleiderer2 — 1Jülich Center for Neutron Science at MLZ, Jülich, Germany — 2Technical University Munich, Garching, Germany — 3Karlsruhe Institute of Technology, Karlsruhe, Germany
Magnetic dipole-dipole interactions have been known to be the source of non-analytical behaviour of associated spin wave dispersions in the long wavelength limit [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 from finite resolution inelastic neutron scattering experiments performed on the 4f electron system ErB2. We argue that the joint presence of strong dipole-dipole interactions and a large anisotropy can account for the exotic features observed in the recorded spectra of magnetic excitations.
[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