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Indirect excitation of ultrafast demagnetization
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(2016) Indirect excitation of ultrafast demagnetization. Scientific Reports, 6 (1). 18970. doi:10.1038/srep18970 ISSN 2045-2322.
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Official URL: http://dx.doi.org/10.1038/srep18970
Abstract
Does the excitation of ultrafast magnetization require direct interaction between the photons of the optical pump pulse and the magnetic layer? Here, we demonstrate unambiguously that this is not the case. For this we have studied the magnetization dynamics of a ferromagnetic cobalt/palladium multilayer capped by an IR-opaque aluminum layer. Upon excitation with an intense femtosecond-short IR laser pulse, the film exhibits the classical ultrafast demagnetization phenomenon although only a negligible number of IR photons penetrate the aluminum layer. In comparison with an uncapped cobalt/palladium reference film, the initial demagnetization of the capped film occurs with a delayed onset and at a slower rate. Both observations are qualitatively in line with energy transport from the aluminum layer into the underlying magnetic film by the excited, hot electrons of the aluminum film. Our data thus confirm recent theoretical predictions.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Scientific Reports | ||||||
Publisher: | Nature Publishing Group | ||||||
ISSN: | 2045-2322 | ||||||
Official Date: | 6 January 2016 | ||||||
Dates: |
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Volume: | 6 | ||||||
Number: | 1 | ||||||
Article Number: | 18970 | ||||||
DOI: | 10.1038/srep18970 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 19 October 2020 | ||||||
Date of first compliant Open Access: | 19 October 2020 |
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