Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Ultrafast Magnetization III

MA 30.2: Talk

Wednesday, March 18, 2020, 09:45–10:00, HSZ 101

A novel high flux XUV light source for the study of ultrafast element-specific magnetization dynamics — •Christina Möller, Johannes Otto, Henrike Probst, Mariana Brede, Matthijs Jansen, Sabine Steil, Daniel Steil, and Stefan Mathias — 1. Physikalisches Institut, Göttingen, Germany

In recent years, it has been shown that the combination of a femtosecond extreme ultraviolet (XUV) light source with magneto-optical Kerr measurements (MOKE) provides a powerful tool for the study of element-specific magnetization dynamics. Using a high-harmonic based XUV MOKE setup, it was for instance found that femtosecond spin currents drive ultrafast magnetic processes [1], how magnetic sublattices interact on femtosecond timescales [2], and that spin dynamics can be induced coherently and directly on the timescale of the optical excitation itself [3,4].

Here, we present our new element-specific HHG based MOKE experiment, which makes use of a high-repetition rate fiber-based laser amplifier system, and adds high magnetic fields and cooling capabilities to the control of the magnetic sample, thereby overcoming limitations of the first harmonic generation (HHG) based MOKE setups. We show first element-specific data of a Fe/Ni alloy and manganite films highlighting the improved signal quality of the setup.

[1] Rudolf et al., Nature Comm. 3, 1037 (2012).

[2] Mathias et al., PNAS 108, 4792 (2012).

[3] Hofherr et al., Science Advances, in press (2019).

[4] Siegrist et al., Nature 571, 240 (2019).