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Nontrivial Aharonov-Bohm effect and alternating dispersion of magnons in cone-state ferromagnetic rings

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arxiv 2308.08486 v3 pith:UEWVXD3U submitted 2023-08-16 cond-mat.mes-hall cond-mat.mtrl-sci

Vera Uzunova , Lukas Körber , Agapi Kavvadia , Gwendolyn Quasebarth , Helmut Schultheiss , Attila Kákay , Boris Ivanov This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords effectmagneticmoderingsaharonov-bohmazimuthalmagnonmodes
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Soft magnetic dots in the form of thin rings have unique topological properties. They can be in a vortex state with no vortex core. Here, we study the magnon modes of such systems both analytically and numerically. In an external magnetic field, magnetic rings are characterized by easy-cone magnetization and shows a giant splitting of doublets for modes with the opposite value of the azimuthal mode quantum number. The effect of the splitting can be refereed as a magnon analog of the topology-induced Aharonov-Bohm effect. For this we develop an analytical theory to describe the non-monotonic dependence of the mode frequencies on the azimuthal mode number, influenced by the balance between the local exchange and non-local dipole interactions.

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  1. Excitation of vortex core gyration in nanopillars through driven Floquet magnons

    cond-mat.mes-hall 2025-07 conditional novelty 5.0 of 10

    RF-driven azimuthal spin waves in a 300 nm vortex nanopillar support multiple steady-state gyration radii, each producing a distinct Floquet frequency comb, so the device can be hysteretic.

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