Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy
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arXiv
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| Format: | Preprint |
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2023
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| author | Jechumtál, Jiří Rouzegar, Reza Gueckstock, Oliver Denker, Christian Hoppe, Wolfgang Remy, Quentin Seifert, Tom S. Kubaščík, Peter Woltersdorf, Georg Brouwer, Piet W. Münzenberg, Markus Kampfrath, Tobias Nádvorník, Lukáš |
| author_facet | Jechumtál, Jiří Rouzegar, Reza Gueckstock, Oliver Denker, Christian Hoppe, Wolfgang Remy, Quentin Seifert, Tom S. Kubaščík, Peter Woltersdorf, Georg Brouwer, Piet W. Münzenberg, Markus Kampfrath, Tobias Nádvorník, Lukáš |
| contents | We study the spatiotemporal dynamics of ultrafast electron spin transport across nanometer-thick copper layers using broadband terahertz spectroscopy. Our analysis of temporal delays, broadening and attenuation of the spin-current pulse revealed ballistic-like propagation of the pulse peak, approaching the Fermi velocity, and diffusive features including a significant velocity dispersion. A comparison to the frequency-dependent Ficks law identified the diffusion-dominated transport regime for distances larger than 2 nm. The findings lie the groundwork for designing future broadband spintronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_12082 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy Jechumtál, Jiří Rouzegar, Reza Gueckstock, Oliver Denker, Christian Hoppe, Wolfgang Remy, Quentin Seifert, Tom S. Kubaščík, Peter Woltersdorf, Georg Brouwer, Piet W. Münzenberg, Markus Kampfrath, Tobias Nádvorník, Lukáš Mesoscale and Nanoscale Physics Materials Science We study the spatiotemporal dynamics of ultrafast electron spin transport across nanometer-thick copper layers using broadband terahertz spectroscopy. Our analysis of temporal delays, broadening and attenuation of the spin-current pulse revealed ballistic-like propagation of the pulse peak, approaching the Fermi velocity, and diffusive features including a significant velocity dispersion. A comparison to the frequency-dependent Ficks law identified the diffusion-dominated transport regime for distances larger than 2 nm. The findings lie the groundwork for designing future broadband spintronic devices. |
| title | Accessing ultrafast spin-transport dynamics in copper using broadband terahertz spectroscopy |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2310.12082 |