Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 5: Magnetization/Demagnetization Dynamics
MA 5.8: Vortrag
Montag, 20. März 2017, 11:30–11:45, HSZ 401
Pump-Probe Holographic Imaging of Nanoscale Magnetic Domains — S. Schleitzer1, L. Müller1, •M. Riepp1, A. Philippi-Kobs1, W. Roseker1, C. Gutt1, M. H. Berntsen1, B. Pfau2, D. Weder2, J. Geilhufe2, C. von Korff Schmising2, B. Vodungbo3, J. Gautier3, K. Li3, G. Malinowski3, B. Tudu3, F. Capotondi4, E. Pedersoli4, M. Kiskinova4, J. Lüning3, S. Eisebitt2, and G. Grübel1 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Technische Universität Berlin, Berlin, Germany — 3Université Pierre et Marie Curie, Paris, France — 4Elettra-Sincrotrone Trieste, Basovizza, Italy
While ultrafast magnetization dynamics of homogeneously magnetized samples has been studied by optical pump-probe techniques since decades, it is still an open question how nanoscale magnetic domain patterns react to an ultrashort optical stimulus. Here, we report on an optical pump–free electron laser (FEL)-probe imaging experiment on a (Co0.4nm/Pd0.2nm)30 multilayer deposited on a Si3N4 membrane. The multilayer exhibits a perpendicular magnetic anisotropy and a disordered maze-domain pattern (domain size of 80 nm). The experiment was conducted at DiProI beamline at FERMI@Elettra using FEL radiation tuned resonantly to the M3 absorption edge of cobalt. By using Fourier transform holography, the real-space domain configuration could be directly retrieved unambiguously from the scattering data. We fixed the pump-probe delay time to 1 ps and followed the evolution of the domain pattern at different pump fluences revealing ultrafast demagnetization in real space on the nanoscale.