Author:
Vodungbo Boris,Tudu Bharati,Perron Jonathan,Delaunay Renaud,Müller Leonard,Berntsen Magnus H.,Grübel Gerhard,Malinowski Grégory,Weier Christian,Gautier Julien,Lambert Guillaume,Zeitoun Philippe,Gutt Christian,Jal Emmanuelle,Reid Alexander H.,Granitzka Patrick W.,Jaouen Nicolas,Dakovski Georgi L.,Moeller Stefan,Minitti Michael P.,Mitra Ankush,Carron Sebastian,Pfau Bastian,von Korff Schmising Clemens,Schneider Michael,Eisebitt Stefan,Lüning Jan
Abstract
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.
Publisher
Springer Science and Business Media LLC
Cited by
64 articles.
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