Magnon-mediated terahertz spin transport in metallic Gd|Pt stacks
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917969636884480 |
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| author | Gueckstock, Oliver Amrhein, Tim Andres, Beatrice Jiménez-Cavero, Pilar Gahl, Cornelius Seifert, Tom S. Rouzegar, Reza Radu, Ilie Lucas, Irene Wietstruk, Marko Morellón, Luis Weinelt, Martin Kampfrath, Tobias Thielemann-Kühn, Nele |
| author_facet | Gueckstock, Oliver Amrhein, Tim Andres, Beatrice Jiménez-Cavero, Pilar Gahl, Cornelius Seifert, Tom S. Rouzegar, Reza Radu, Ilie Lucas, Irene Wietstruk, Marko Morellón, Luis Weinelt, Martin Kampfrath, Tobias Thielemann-Kühn, Nele |
| contents | We study femtosecond spin transport in a Gd|Pt stack induced by a laser pulse. Remarkably, the dynamics of the spin current from Gd to Pt suggests that its dominant driving force is the ultrafast spin Seebeck effect. As the contribution of a transient spin voltage in the metal Gd is minor, Gd acts akin a magnetic insulator here. This view is supported by time- and spin-resolved photoemission, which indicates that a buildup of spin voltage is suppressed by exchange scattering, leading to similar amplitudes and relaxation rates of hot majority- and minority-spin electron populations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_22483 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnon-mediated terahertz spin transport in metallic Gd|Pt stacks Gueckstock, Oliver Amrhein, Tim Andres, Beatrice Jiménez-Cavero, Pilar Gahl, Cornelius Seifert, Tom S. Rouzegar, Reza Radu, Ilie Lucas, Irene Wietstruk, Marko Morellón, Luis Weinelt, Martin Kampfrath, Tobias Thielemann-Kühn, Nele Mesoscale and Nanoscale Physics We study femtosecond spin transport in a Gd|Pt stack induced by a laser pulse. Remarkably, the dynamics of the spin current from Gd to Pt suggests that its dominant driving force is the ultrafast spin Seebeck effect. As the contribution of a transient spin voltage in the metal Gd is minor, Gd acts akin a magnetic insulator here. This view is supported by time- and spin-resolved photoemission, which indicates that a buildup of spin voltage is suppressed by exchange scattering, leading to similar amplitudes and relaxation rates of hot majority- and minority-spin electron populations. |
| title | Magnon-mediated terahertz spin transport in metallic Gd|Pt stacks |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.22483 |