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MA: Fachverband Magnetismus
MA 16: Magnetization and Demagnetization Dynamics I
MA 16.2: Vortrag
Dienstag, 8. März 2016, 09:45–10:00, H34
Optically induced magnetization dynamics probed by Lorentz microscopy — •Marcel Möller1, Tim Eggebrecht2, Nara Rubiano da Silva1, Jan Gregor Gatzmann1, Theo Diekmann1, Armin Feist1, Ulrike Martens3, Henning Ulrichs2, Vladyslav Zbarsky2, Markus Münzenberg3, Claus Ropers1, and Sascha Schäfer1 — 14th Physical Institute, University of Göttingen, Germany — 21st Physical Institute, University of Göttingen, Germany — 3Interface and Surface Physics, University of Greifswald, Germany
Combining Lorentz microscopy with in-situ optical excitation promises fascinating new insights into magnetization dynamics. Following two different approaches, first we present the generation of a dense vortex-antivortex network by a single intense femtosecond laser pulse in a thin continuous Fe/SN bilayer. The spatial distribution of the vortex-antivortex network exhibits glasslike properties, with well-defined short-range correlations. The formation of the defect network is explained with a Kibble-Zurek-type mechanism involving a rapid temperature quench from the paramagnetic to the ferromagnetic phase.
Secondly, we will report on the ultrafast Lorentz imaging of nanostructured magnetic thin films. Applying a electron-pump/laser-probe scheme using an ultrafast transmission electron microscope (UTEM) will yield access to temporally and spatially resolved magnetization dynamics.