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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 43: Magnetization Dynamics II of 3

MA 43.1: Talk

Thursday, March 14, 2013, 15:00–15:15, H22

Ultrafast spin transport as key to femtosecond demagnetization — •Andrea Eschenlohr1, Marco Battiato2, Pablo Maldonado2, Niko Pontius1, Torsten Kachel1, Karsten Holldack1, Rolf Mitzner1, Alexander Föhlisch1, Peter M. Oppeneer2, and Christian Stamm11Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 2Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden

Ultrafast demagnetization of ferromagnetic metals is typically triggered by excitation with a femtosecond laser pulse. Here we demonstrate that hot electrons transported into a ferromagnetic layer can induce demagnetization as fast and efficient as direct laser excitation. We investigate a layered structure consisting of a Ni film covered by a Au layer, with the thickness of the Au layer chosen such that the incident laser pulse is completely absorbed. Magnetization dynamics in the buried Ni film is measured with x-ray magnetic circular dichroism in transmission geometry at the BESSY II Femtoslicing source, finding sub-picosecond demagnetization of equal magnitude as in a directly excited Ni film. Simulations show that the observed demagnetization is due to spin-dependent transport of non-equilibrium electrons from the Au layer through the ferromagnetic layer into the substrate.

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