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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.20958 |
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| _version_ | 1866917231738224640 |
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| author | Wittrock, Steffen Klose, Christopher Perna, Salvatore Baumgaertl, Korbinian Mucchietto, Andrea Schneider, Michael Fuchs, Josefin Deinhart, Victor Karaman, Tamer Grundler, Dirk Eisebitt, Stefan Pfau, Bastian Schick, Daniel |
| author_facet | Wittrock, Steffen Klose, Christopher Perna, Salvatore Baumgaertl, Korbinian Mucchietto, Andrea Schneider, Michael Fuchs, Josefin Deinhart, Victor Karaman, Tamer Grundler, Dirk Eisebitt, Stefan Pfau, Bastian Schick, Daniel |
| contents | Magnons are quantised collective excitations of long-range ordered spins. At nanometre wavelengths, exchange interactions increasingly govern their dynamics, giving rise to a largely unexplored regime of couplings between magnons and other quasiparticles. Yet, detecting such short-wavelength spin waves has remained a key experimental challenge. Here, we introduce Magnon Momentum Microscopy (MMM) -- a quasi-elastic, resonant magnetic soft-X-ray scattering technique that directly images magnon populations across two-dimensional momentum space. Owing to its remarkable sensitivity, MMM can capture nonlinear magnon-magnon interactions over large regions of the dispersion plane. Applying MMM to the prototypical magnonic material yttrium iron garnet (YIG), we uncover a rich variety of previously unobserved nonlinear magnon interactions. With its element specificity, bulk sensitivity, as well as intrinsic access to nanometre-scale wavelengths without frequency limitation, soft-X-ray MMM establishes a powerful and versatile platform for exploring short-wavelength and nonlinear magnonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_20958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Soft-X-ray momentum microscopy of nonlinear magnon interactions below 100-nm wavelength Wittrock, Steffen Klose, Christopher Perna, Salvatore Baumgaertl, Korbinian Mucchietto, Andrea Schneider, Michael Fuchs, Josefin Deinhart, Victor Karaman, Tamer Grundler, Dirk Eisebitt, Stefan Pfau, Bastian Schick, Daniel Mesoscale and Nanoscale Physics Materials Science Magnons are quantised collective excitations of long-range ordered spins. At nanometre wavelengths, exchange interactions increasingly govern their dynamics, giving rise to a largely unexplored regime of couplings between magnons and other quasiparticles. Yet, detecting such short-wavelength spin waves has remained a key experimental challenge. Here, we introduce Magnon Momentum Microscopy (MMM) -- a quasi-elastic, resonant magnetic soft-X-ray scattering technique that directly images magnon populations across two-dimensional momentum space. Owing to its remarkable sensitivity, MMM can capture nonlinear magnon-magnon interactions over large regions of the dispersion plane. Applying MMM to the prototypical magnonic material yttrium iron garnet (YIG), we uncover a rich variety of previously unobserved nonlinear magnon interactions. With its element specificity, bulk sensitivity, as well as intrinsic access to nanometre-scale wavelengths without frequency limitation, soft-X-ray MMM establishes a powerful and versatile platform for exploring short-wavelength and nonlinear magnonics. |
| title | Soft-X-ray momentum microscopy of nonlinear magnon interactions below 100-nm wavelength |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2504.20958 |