Revealing domain wall stability during ultrafast demagnetization
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914489901776896 |
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| author | Chang, Hung-Tzu Zayko, Sergey Schmidt, Timo Kfir, Ofer Sivis, Murat Mentink, Johan H. Albrecht, Manfred Ropers, Claus |
| author_facet | Chang, Hung-Tzu Zayko, Sergey Schmidt, Timo Kfir, Ofer Sivis, Murat Mentink, Johan H. Albrecht, Manfred Ropers, Claus |
| contents | The ultrafast control of nanoscale spin textures such as magnetic domain walls or skyrmions is essential for advancing high-speed, high-density spintronics. However, imaging their dynamics will require a technique that combines nanometer spatial and femtosecond temporal resolution. Introducing ultrafast sub-wavelength imaging in the extreme ultraviolet, we track domain wall properties during ultrafast demagnetization in ferro- and ferrimagnetic thin films. We reveal that domain walls remain invariant in position, shape, and width, down to a demonstrated sub-nanometer precision, for up to 50% demagnetization. Stronger excitation causes stochastic nanoscale domain switching. This previously unobservable robustness of laser-excited domain walls highlights the localized nature of photoinduced demagnetization and presents both challenges and opportunities for all-optical magnetic control. The presented technique can be generalized to directly probe nanoscale dynamics in spintronic materials and devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17917 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revealing domain wall stability during ultrafast demagnetization Chang, Hung-Tzu Zayko, Sergey Schmidt, Timo Kfir, Ofer Sivis, Murat Mentink, Johan H. Albrecht, Manfred Ropers, Claus Materials Science Mesoscale and Nanoscale Physics The ultrafast control of nanoscale spin textures such as magnetic domain walls or skyrmions is essential for advancing high-speed, high-density spintronics. However, imaging their dynamics will require a technique that combines nanometer spatial and femtosecond temporal resolution. Introducing ultrafast sub-wavelength imaging in the extreme ultraviolet, we track domain wall properties during ultrafast demagnetization in ferro- and ferrimagnetic thin films. We reveal that domain walls remain invariant in position, shape, and width, down to a demonstrated sub-nanometer precision, for up to 50% demagnetization. Stronger excitation causes stochastic nanoscale domain switching. This previously unobservable robustness of laser-excited domain walls highlights the localized nature of photoinduced demagnetization and presents both challenges and opportunities for all-optical magnetic control. The presented technique can be generalized to directly probe nanoscale dynamics in spintronic materials and devices. |
| title | Revealing domain wall stability during ultrafast demagnetization |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.17917 |