Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Focus Session: THz meets X-ray

O 46.3: Topical Talk

Mittwoch, 18. März 2015, 11:30–12:00, MA 001

Magnetization Dynamics seen via Pump-Probe Holographic X-ray Imaging — •Stefan Eisebitt — Institut für Optik und Atomare Physik, Technische Universität Berlin — Division of Synchrotron Radiation Research, Lund University

Magnetism exhibits phenomena on intrinsic timescales spanning many orders of magnitude, due to its electronic nature including ultrafast phenomena on short length scales. I will demonstrate how x-ray Fourier transform holography (FTH) with magnetic dichroism contrast [1] can be used in pump-probe schemes to follow magnetization dynamics on the nano-, pico- and femtosecond time scale in real space. Specifically, results on the GHz dynamic behavior of magnetic bubbles (pumped by magnetic field pulses) [2] and on ultrafast optical demagnetization (pumped by localized IR pulses) [3] will be discussed.

[1] S. Eisebitt et al., Lensless imaging of magnetic nanostructures by X-ray spectro-holography, Nature 432, 885 (2004).

[2] F. Büttner et al., Dynamics and inertia of skyrmionic spin structures, (Nature Physics, accepted)

[3] C. von Korff Schmising et al., Imaging Ultrafast Demagnetization Dynamics after a Spatially Localized Optical Excitation, Phys Rev Lett 112, 217203 (2014)