Journal Article

PUBDB-2016-04819

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Indirect excitation of ultrafast demagnetization

Vodungbo, B. (Corresponding author)Extern* ; Tudu, B. ; Perron, J. ; Delaunay, R.Extern* ; Müller, L.DESY* ; Berntsen, M. H. ; Grübel, G.DESY* ; Malinowski, G.Extern* ; Weier, C.Extern* ; Gautier, J. ; Lambert, G. ; Zeitoun, P.Extern* ; Gutt, C.Extern* ; Jal, E.Extern* ; Reid, A. H. ; Granitzka, P. W. ; Jaouen, N.Extern* ; Dakovski, G. L. ; Moeller, S.Extern* ; Minitti, M. P. ; Mitra, A. ; Carron, S. ; Pfau, B.Extern* ; von Korff Schmising, C.Extern* ; Schneider, M. ; Eisebitt, S.Extern* ; Lüning, J.Extern*

2016
Nature Publishing Group London

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Please use a persistent id in citations: doi: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.

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Contributing Institute(s):

1. Coherent X-ray Scattering (FS-CXS)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2016

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