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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.44: Poster
Dienstag, 1. April 2014, 13:00–15:30, P1
Time- and spatially-resolved imaging of magnetization dynamics using threshold magnetic circular dichroism — •Maximilian Staab1,2, Florian Schertz1, Hans-Joachim Elmers1, Mathias Kläui1,2, and Gerd Schönhense1 — 1Johannes Gutenberg Universität Mainz, Staudinger Weg 7, 55128 Mainz — 2MAINZ Graduate School of Excellence, Staudinger Weg 9, 55128 Mainz
While the static magnetic properties of nanostructures have been investigated for many decades, the magnetization dynamics in the femto- and picosecond range that governs the ultimate device performance is not yet understood completely and has therefore become recently the focus of research. To determine the spin dynamics with spatial and time resolution, threshold magnetic circular dichroism[1] is used as a contrast mechanism that describes asymmetries of the photoemission yield dependent on the magnetization orientation in a solid. It can be used for magnetic imaging combining very good spatial- and femtosecond time-resolution. For our measurements we fabricated perpendicularly magnetized thin Co/Au films and investigated them using photoemission electron microscopy with magnetic sensitivity due to threshold magnetic circular dichroism. Adding a femtosecond laser based pump-probe setup we aim at imaging spatially resolved magnetization dynamics within the femtosecond timescale to understand effects such as ultrafast demagnetization[2]. Project funded by DFG EL172/15.
[1] K. Hild et al., Phys. Rev. Lett. 102, 057207, (2009)
[2] E. Beaurepaire et al., Phys. Rev. Lett. 76, 4250-4253, (1996)