Modification of three-magnon splitting in a flexed magnetic vortex
| Autor: | L. Körber, C. Heins, I. Soldatov, R. Schäfer, A. Kákay, H. Schultheiss, K. Schultheiss |
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| Rok vydání: | 2023 |
| Předmět: |
Condensed Matter - Materials Science
Kerr microscopy Condensed Matter - Mesoscale and Nanoscale Physics Physics and Astronomy (miscellaneous) BLS Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences micromagnetic modeling three-magnon splitting Physics - Applied Physics Applied Physics (physics.app-ph) reservoir computing vortex Mesoscale and Nanoscale Physics (cond-mat.mes-hall) spin wave magnon |
| Zdroj: | Applied Physics Letters 122(2023), 092401 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | We present an experimental and numerical study of three-magnon splitting in a micrometer-sized magnetic disk with a vortex state strongly deformed by static in-plane magnetic fields. Excited with large enough power at frequency [Formula: see text], the primary radial magnon modes of a cylindrical magnetic vortex can decay into secondary azimuthal modes via spontaneous three-magnon splitting. This nonlinear process exhibits selection rules leading to well-defined and distinct frequencies [Formula: see text] of the secondary modes. Here, we demonstrate that three-magnon splitting in vortices can be significantly modified by deforming the magnetic vortex with in-plane magnetic fields, leading to a much richer three-magnon response. We find that, with increasing field, an additional class of secondary modes is excited, which are localized to highly flexed regions adjacent to the displaced vortex core. While these modes satisfy the same selection rules of three-magnon splitting, they exhibit much lower three-magnon threshold power compared to regular secondary modes of a centered vortex. The applied static magnetic fields are small ([Formula: see text]), providing an effective parameter to control the nonlinear spectral response of confined vortices. Our work expands the understanding of nonlinear magnon dynamics in vortices and advertises these for potential neuromorphic applications based on magnons. |
| Databáze: | OpenAIRE |
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