Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.64: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Driving Ultrafast Magnetization Dynamics of Gd with Near-Infrared Laser Pulses — •Kamil Bobowski1, Beatrice Andres1, Robert Carley2, Björn Frietsch1, Markus Gleich1, Cephise Cacho3, Emma Springate3, Serguei Molodtsov2, and Martin Weinelt1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld — 3Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
We investigated the ultrafast magnetization dynamics of a single-crystalline Gd(0001) thin film with the high-harmonic source at the Artemis Facility at Rutherford Appleton Laboratory. In contrast to most studies, we employ 1300-nm pump pulses. In agreement with our earlier measurements, we observe a considerable redistribution of the electronic population around the Fermi level and a fast decrease of the exchange splitting of the valence bands [1]. However, within the first 200 fs we find an increase of the exchange splitting, which was also observed in MOKE experiments [2], caused by a dip in the majority band binding energy. In addition, we observe oscillations in the energetic position of the valence bands and the surface state before excitation. We discuss these oscillations in the framework of ponderomotive acceleration by a transient grating formed by the interference of the incoming and outgoing pump pulses [3].
[1] R. Carley et. al., Phys. Rev. Lett. 109, 057401 (2012).
[2] M. Sultan et. al., Phys. Rev. B 85, 184407 (2012).
[3] U. Bovensiepen et. al., Phys. Rev. B 79, 045415 (2009).