Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.6: Talk
Wednesday, March 9, 2016, 10:45–11:00, H34
Probing ultrafast spin dynamics of interface induced magnetism in platinum with circular polarized light from high harmonics generation — •Felix Willems1,2, Christopher Smeenk2, David Weder1,2, Nick Zhavoronkov2, Oleg Kornilov2, Clemens von Korff Schmising2, Ilie Radu2, Marc Vrakking2, and Stefan Eisebitt1,2 — 1IOAP, TU Berlin, Straße des 17.Juni 135, 10623 Berlin — 2Max-Born-Institut, Max-Born-Straße 2 A, 12489 Berlin
All-optical control and manipulation of magnetization in thin magnetic films is a promising route for spintronic and next-generation magnetic data storage devices [1, 2]. However, progress in understanding and, hence, in the successful design of such new multi-component magnetic systems for ultrafast applications has been challenged by the difficulty to experimentally access the underlying complex microscopic processes. We combine a high harmonic generation source with a λ/4 phase shifter to obtain circularly polarized XUV fs-pulses. The broad spectral bandwidth spanning 40-70 eV makes simultaneous detection of the element-specific spin dynamics via XMCD absorption spectroscopy possible. This allows us to extract information about individual contributions of the different materials and interacting spin systems. We report on first measurements of a Pt/Co/Pt sample showing simultaneous ultrafast demagnetization of Co and spin polarized Pt at the Co interface after optical excitation [3]. [1] A. Kirilyuk, A. et al., Rep Prog Phys 76, 026501 (2013). [2] S. Mangin, et al., Nature Materials 13, 286 (2014). [3] F. Willems et al., PRB R (in press)