Observation of thermally activated coherent magnon-magnon coupling in a magnonic hybrid system
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912616364900352 |
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| author | Wagle, Dinesh Li, Yi Kaffash, Mojtaba Taghipour Lendinez, Sergi Hossain, Mohammad Tomal Novosad, Valentine Jungfleisch, M. Benjamin |
| author_facet | Wagle, Dinesh Li, Yi Kaffash, Mojtaba Taghipour Lendinez, Sergi Hossain, Mohammad Tomal Novosad, Valentine Jungfleisch, M. Benjamin |
| contents | We experimentally demonstrate strong magnon-magnon coupling by thermal spin excitations in yttrium iron garnet/permalloy (YIG/Py) hybrid structures using microfocused Brillouin light scattering - an optical technique that enables the detection of zero-wavevector and higher-order wavevector spin waves in a broad frequency range. The thermally activated magnons in the bilayer lead to a hybrid excitation between magnon modes in the conductive Py layer with a wide wavevector range and the first perpendicular standing magnon modes in the insulating YIG layer, facilitated by strong interfacial exchange coupling. To further investigate this coupling, we compare the thermal magnon spectra with the results obtained from electrical excitation and detection methods, which primarily detect the uniform Py mode. The realization of coherent coupling between incoherent (thermal) magnons is important for advancing energy-efficient magnonic devices, particularly in classical as well as quantum spin-wave computing technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14875 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of thermally activated coherent magnon-magnon coupling in a magnonic hybrid system Wagle, Dinesh Li, Yi Kaffash, Mojtaba Taghipour Lendinez, Sergi Hossain, Mohammad Tomal Novosad, Valentine Jungfleisch, M. Benjamin Mesoscale and Nanoscale Physics Materials Science We experimentally demonstrate strong magnon-magnon coupling by thermal spin excitations in yttrium iron garnet/permalloy (YIG/Py) hybrid structures using microfocused Brillouin light scattering - an optical technique that enables the detection of zero-wavevector and higher-order wavevector spin waves in a broad frequency range. The thermally activated magnons in the bilayer lead to a hybrid excitation between magnon modes in the conductive Py layer with a wide wavevector range and the first perpendicular standing magnon modes in the insulating YIG layer, facilitated by strong interfacial exchange coupling. To further investigate this coupling, we compare the thermal magnon spectra with the results obtained from electrical excitation and detection methods, which primarily detect the uniform Py mode. The realization of coherent coupling between incoherent (thermal) magnons is important for advancing energy-efficient magnonic devices, particularly in classical as well as quantum spin-wave computing technologies. |
| title | Observation of thermally activated coherent magnon-magnon coupling in a magnonic hybrid system |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2503.14875 |