SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Focus Session: Ultrafast Dynamics in Nanostructures II
O 83.4: Vortrag
Donnerstag, 30. März 2023, 16:00–16:15, GER 38
Imaging of femtosecond spin dynamics at the nanoscale — •Sergey Zayko1,4, Hung-Tzu Chang1, Ofer Kfir2, Timo Schmidt3, Jakob Hagen1, Michael Heigl3, Murat Sivis1,4, Manfred Albrecht3, and Claus Ropers1,4 — 1Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 2School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel — 3Experimental Physics IV, Institute for Physics, University of Augsburg, Germany — 4IV Physical Institute, Solids and Nanostructures, Georg-August University
Femtosecond pulse durations combined with broad extreme-UV spectrum inherent to high harmonic generation (HHG) grant spectroscopic access to various material properties and phenomena including charge, spin and lattice dynamics. Here, we extend the applicability of HHG sources to direct real-space imaging of ultrafast processes. Specifically, we map femtosecond spin dynamics induces by optical excitations ferro- and ferrimagnetic materials. Our results demonstrate the first implementation of HHG radiation for element specific imaging as well as the first real-space imaging of femtosecond dynamics. Moreover, the achieved spatio-temporal resolution (down to 13.5 nm spatial and 15 fs temporal) is more than an order of magnitude higher than any magneto-optical imaging scheme reported so far, which would facilitate deeper fundamental understanding and, in particular, support application-oriented studies. Notably, the developed imaging scheme is directly applicable to a broad range of phenomena including transient absorption and structural phase transitions.