Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912147132383232 |
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| author | Légaré, Katherine Barrette, Guillaume Giroux, Laurent Parent, Jean-Michel Haddad, Elissa Ibrahim, Heide Lassonde, Philippe Jal, Emmanuelle Vodungbo, Boris Lüning, Jan Boschini, Fabio Jaouen, Nicolas Légaré, François |
| author_facet | Légaré, Katherine Barrette, Guillaume Giroux, Laurent Parent, Jean-Michel Haddad, Elissa Ibrahim, Heide Lassonde, Philippe Jal, Emmanuelle Vodungbo, Boris Lüning, Jan Boschini, Fabio Jaouen, Nicolas Légaré, François |
| contents | In the last few decades, ultrafast demagnetization elicited by ultrashort laser pulses has been the subject of a large body of work that aims to better understand and control this phenomenon. Although specific magnetic materials' properties play a key role in defining ultrafast demagnetization dynamics, features of the driving laser pulse such as its duration and photon energy might also contribute. Here, we report ultrafast demagnetization of a cobalt/platinum multilayer in a broad spectral range spanning from the near-infrared (near-IR) to the mid-infrared (mid-IR), with wavelengths between 0.8 and 8.7 $μ$m. The ultrafast dynamics of the macroscopic magnetization is tracked via the time-resolved magneto-optical Kerr effect. We show that the ultrafast demagnetization of the sample can be efficiently induced over that entire excitation spectrum with minimal dependence on the excitation wavelength. Instead, we confirm that the temporal profile of the pump excitation pulse is an important factor influencing ultrafast demagnetization dynamics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_04892 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system Légaré, Katherine Barrette, Guillaume Giroux, Laurent Parent, Jean-Michel Haddad, Elissa Ibrahim, Heide Lassonde, Philippe Jal, Emmanuelle Vodungbo, Boris Lüning, Jan Boschini, Fabio Jaouen, Nicolas Légaré, François Materials Science In the last few decades, ultrafast demagnetization elicited by ultrashort laser pulses has been the subject of a large body of work that aims to better understand and control this phenomenon. Although specific magnetic materials' properties play a key role in defining ultrafast demagnetization dynamics, features of the driving laser pulse such as its duration and photon energy might also contribute. Here, we report ultrafast demagnetization of a cobalt/platinum multilayer in a broad spectral range spanning from the near-infrared (near-IR) to the mid-infrared (mid-IR), with wavelengths between 0.8 and 8.7 $μ$m. The ultrafast dynamics of the macroscopic magnetization is tracked via the time-resolved magneto-optical Kerr effect. We show that the ultrafast demagnetization of the sample can be efficiently induced over that entire excitation spectrum with minimal dependence on the excitation wavelength. Instead, we confirm that the temporal profile of the pump excitation pulse is an important factor influencing ultrafast demagnetization dynamics. |
| title | Near- and mid-infrared excitation of ultrafast demagnetization in a cobalt multilayer system |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.04892 |