Demagnetization dynamics after noncollinear dual optical excitation
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910419386368000 |
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| author | Parchenko, Sergii Riepp, Matthias Marotzke, Simon Larsson, Agne Åberg Kapaklis, Vassilios Oppeneer, Peter M. Scherz, Andreas |
| author_facet | Parchenko, Sergii Riepp, Matthias Marotzke, Simon Larsson, Agne Åberg Kapaklis, Vassilios Oppeneer, Peter M. Scherz, Andreas |
| contents | We explore the impact of optical excitation using two interfering ultrashort optical pulses on ultrafast magnetization dynamics. Our investigation focuses on Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach. We observe significant variations in the dynamics of magnetization suppression and subsequent recovery when triggered with two optical pulses of the same polarization-essentially meeting conditions for interference. Conversely, dynamics triggered with cross-polarized pump beams exhibit expected similarity to that triggered with a single pulse. Delving into the underlying physical processes contributing to laser-induced demagnetization and recovery dynamics, we find that our current understanding cannot elucidate the observed trends. Consequently, we propose that optical excitation with interfering light possesses not previously acknowledged capacity to induce long-lasting alterations in the dynamics of angular momentum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_15110 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Demagnetization dynamics after noncollinear dual optical excitation Parchenko, Sergii Riepp, Matthias Marotzke, Simon Larsson, Agne Åberg Kapaklis, Vassilios Oppeneer, Peter M. Scherz, Andreas Optics Materials Science We explore the impact of optical excitation using two interfering ultrashort optical pulses on ultrafast magnetization dynamics. Our investigation focuses on Pt/Co/Pt multilayers and TbCo alloy samples, employing a dual pump approach. We observe significant variations in the dynamics of magnetization suppression and subsequent recovery when triggered with two optical pulses of the same polarization-essentially meeting conditions for interference. Conversely, dynamics triggered with cross-polarized pump beams exhibit expected similarity to that triggered with a single pulse. Delving into the underlying physical processes contributing to laser-induced demagnetization and recovery dynamics, we find that our current understanding cannot elucidate the observed trends. Consequently, we propose that optical excitation with interfering light possesses not previously acknowledged capacity to induce long-lasting alterations in the dynamics of angular momentum. |
| title | Demagnetization dynamics after noncollinear dual optical excitation |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2404.15110 |