Exploration of magnon-magnon coupling in an antidot lattice: The role of non-uniform magnetization texture
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916110902755328 |
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| author | Moalic, Mathieu Zelent, Mateusz Szulc, Krzysztof Krawczyk, Maciej |
| author_facet | Moalic, Mathieu Zelent, Mateusz Szulc, Krzysztof Krawczyk, Maciej |
| contents | We numerically study the spin wave dynamics in an antidot lattice based on a Co/Pd multilayer structure with reduced perpendicular magnetic anisotropy at the edges of the antidots. This structure forms a magnonic crystal with a periodic antidot pattern and a periodic magnetization configuration consisting of out-of-plane magnetized bulk and in-plane magnetized rims. Our results show the different behavior of spin waves in the bulk and in the rims under varying out-of-plane external magnetic field strength, revealing complex spin-wave spectra and hybridizations between the modes of these two subsystems. A particularly strong magnon-magnon coupling, due to exchange interactions, is found between the fundamental bulk spin-wave mode and the second-order radial rim modes. However, the dynamical coupling between the spin-wave modes at low frequencies, involving the first-order radial rim modes, is masked by the changes in the static magnetization at the bulk-rim interface with magnetic field changes. The study expands the horizons of magnonic-crystal research by combining periodic structural patterning and non-collinear magnetization texture to achieve strong magnon-magnon coupling, highlighting the significant role of exchange interactions in the coupling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_10540 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exploration of magnon-magnon coupling in an antidot lattice: The role of non-uniform magnetization texture Moalic, Mathieu Zelent, Mateusz Szulc, Krzysztof Krawczyk, Maciej Mesoscale and Nanoscale Physics We numerically study the spin wave dynamics in an antidot lattice based on a Co/Pd multilayer structure with reduced perpendicular magnetic anisotropy at the edges of the antidots. This structure forms a magnonic crystal with a periodic antidot pattern and a periodic magnetization configuration consisting of out-of-plane magnetized bulk and in-plane magnetized rims. Our results show the different behavior of spin waves in the bulk and in the rims under varying out-of-plane external magnetic field strength, revealing complex spin-wave spectra and hybridizations between the modes of these two subsystems. A particularly strong magnon-magnon coupling, due to exchange interactions, is found between the fundamental bulk spin-wave mode and the second-order radial rim modes. However, the dynamical coupling between the spin-wave modes at low frequencies, involving the first-order radial rim modes, is masked by the changes in the static magnetization at the bulk-rim interface with magnetic field changes. The study expands the horizons of magnonic-crystal research by combining periodic structural patterning and non-collinear magnetization texture to achieve strong magnon-magnon coupling, highlighting the significant role of exchange interactions in the coupling. |
| title | Exploration of magnon-magnon coupling in an antidot lattice: The role of non-uniform magnetization texture |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.10540 |