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Indirect excitation of ultrafast demagnetization.

Vodungbo, Boris; Tudu, Bahrati; Perron, Jonathan; Delaunay, Renaud; Müller, Leonard; Berntsen, Magnus H; Grübel, Gerhard; Malinowski, Grégory; Weier, Christian and Gautier, Julien, et al. (2016) In Scientific Reports 6.
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... (More)
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. (Less)
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Scientific Reports
volume
6
publisher
Nature Publishing Group
external identifiers
  • pmid:26733106
  • scopus:84954525302
  • wos:000391987000001
ISSN
2045-2322
DOI
10.1038/srep18970
language
English
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yes
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bf283253-c691-4d53-a91b-8456ed6f02ba (old id 8593006)
date added to LUP
2016-02-11 12:08:52
date last changed
2017-11-19 03:46:11
@article{bf283253-c691-4d53-a91b-8456ed6f02ba,
  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.},
  articleno    = {18970},
  author       = {Vodungbo, Boris and Tudu, Bahrati and Perron, Jonathan and Delaunay, Renaud and Müller, Leonard and Berntsen, Magnus H and Grübel, Gerhard and Malinowski, Grégory and Weier, Christian and Gautier, Julien and Lambert, Guillaume and Zeitoun, Philippe and Gutt, Christian and Jal, Emmanuelle and Reid, Alexander H and Granitzka, Patrick W and Jaouen, Nicolas and Dakovski, Georgi L and Moeller, Stefan and Minitti, Michael P and Mitra, Ankush and Carron, Sebastian and Pfau, Bastian and von Korff Schmising, Clemens and Schneider, Michael and Eisebitt, Stefan and Lüning, Jan},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Indirect excitation of ultrafast demagnetization.},
  url          = {http://dx.doi.org/10.1038/srep18970},
  volume       = {6},
  year         = {2016},
}