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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.21: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Spatially-Localized Second Harmonic Generation via Spin Wave Concentration in Patterned YIG Structures — •Marc Eger¹, Stephanie Lake¹, Philipp Geyer¹, Seth Kurfman¹, Rouven Dreyer¹, and Georg Schmidt^1,2 — ¹Martin-Luther-Universität Halle-Wittenberg Insitut für Physik, Halle, Germany — ²Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany

The anisotropic dispersion and inherent non-linearity of (magnetostatic) spin waves in thin films and confined structures provide unique opportunities for implementation in next-generation radio-frequency devices [1]. A particular challenge remains in establishing effective and useful means to locally generate and subsequently exploit higher harmonics without extraneous non-linear losses [2]. In order to compensate these losses, one method to achieve this is to focus low-intensity spin waves in a low-loss magnetic material to a localised region far from the exciting antenna. This can be done, for example, with deterministically tuning the dispersion relation by modifying film thickness along with a geometric confinement through standard patterning processes. Here we compare micromagnetic simulations and experimental results obtained by frequency- and spatially-resolved SNS MOKE [3] within passive, lithographically-patterned YIG funnel structures, wherein we demonstrate second harmonic generation of magnons.

[1] Ustinov et. al, IEEE Magnetics Letters 10, 1-4, 2019

[2] T. Hula et. al, Appl. Phys. Lett. 117, 042404, 2020

[3] Rouven Dreyer et. al., Phys. Rev. Materials 5, 064411, 2021

Keywords: Ferromagnetic Resonance; Second Harmonic Generation; SNS-MOKE; non-linear Magnonics; YIG