Nonreciprocal Spin Waves in Nanoscale Domain Walls Detected by Scanning X-ray Microscopy in Perpendicular Magnetic Anisotropic Fe/Gd Multilayers
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866908485737775104 |
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| author | Che, Ping Deenen, Axel Mucchietto, Andrea Grafe, Joachim Heigl, Michael Baumgaertl, Korbinian Weigand, Markus Bechtel, Michael Koraltan, Sabri Schutz, Gisela Suess, Dieter Albrecht, Manfred Grundler, Dirk |
| author_facet | Che, Ping Deenen, Axel Mucchietto, Andrea Grafe, Joachim Heigl, Michael Baumgaertl, Korbinian Weigand, Markus Bechtel, Michael Koraltan, Sabri Schutz, Gisela Suess, Dieter Albrecht, Manfred Grundler, Dirk |
| contents | Spin wave nonreciprocity in domain walls (DWs) allows for unidirectional signal processing in reconfigurable magnonic circuits. Using scanning transmission x-ray microscopy (STXM), we examined coherently-excited magnons propagating in Bloch-like DWs in amorphous Fe/Gd multilayers with perpendicular magnetic anisotropy (PMA). Near 1 GHz we detected magnons with short wavelengths down to $λ= 281$ nm in DWs whose minimum width amounted to $δ_{\rm DW} = 52$ nm. Consistent with micromagnetic simulations, the STXM data reveal their nonreciprocal magnon band structures. We identified Bloch points which disrupted the phase evolution of magnons and induced different $λ$ adjacent to the topological defects. Our observations provide direct evidence of nonreciprocal spin waves within Bloch-like DWs, serving as programmable waveguides in magnonic devices with directed information flow. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_06186 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nonreciprocal Spin Waves in Nanoscale Domain Walls Detected by Scanning X-ray Microscopy in Perpendicular Magnetic Anisotropic Fe/Gd Multilayers Che, Ping Deenen, Axel Mucchietto, Andrea Grafe, Joachim Heigl, Michael Baumgaertl, Korbinian Weigand, Markus Bechtel, Michael Koraltan, Sabri Schutz, Gisela Suess, Dieter Albrecht, Manfred Grundler, Dirk Mesoscale and Nanoscale Physics Materials Science Spin wave nonreciprocity in domain walls (DWs) allows for unidirectional signal processing in reconfigurable magnonic circuits. Using scanning transmission x-ray microscopy (STXM), we examined coherently-excited magnons propagating in Bloch-like DWs in amorphous Fe/Gd multilayers with perpendicular magnetic anisotropy (PMA). Near 1 GHz we detected magnons with short wavelengths down to $λ= 281$ nm in DWs whose minimum width amounted to $δ_{\rm DW} = 52$ nm. Consistent with micromagnetic simulations, the STXM data reveal their nonreciprocal magnon band structures. We identified Bloch points which disrupted the phase evolution of magnons and induced different $λ$ adjacent to the topological defects. Our observations provide direct evidence of nonreciprocal spin waves within Bloch-like DWs, serving as programmable waveguides in magnonic devices with directed information flow. |
| title | Nonreciprocal Spin Waves in Nanoscale Domain Walls Detected by Scanning X-ray Microscopy in Perpendicular Magnetic Anisotropic Fe/Gd Multilayers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2311.06186 |