Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Interaction with Strong or Short Laser Pulses II (joint session A/MO)
A 21.6: Vortrag
Mittwoch, 13. März 2024, 15:45–16:00, HS 1010
Extreme-UV microscopy at ultimate spatial and temporal scales — Sergey Zayko1, •Hung-Tzu Chang1, Ofer Kfir2, Murat Sivis1, and Claus Ropers1 — 1Department of Ultrafast Dynamics, Max-Planck-Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany — 2School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, 69978Tel Aviv, Israel
Future developments in logic and storage devices heavily rely on versatile research tools operating at the relevant spatio-temporal scales. In applied research fields such as spintronics and strongly correlated electronic materials, these extend into previously unreachable femtosecond-nanometer regimes [1]. In this work, we demonstrate an experimental advance towards such capabilities with femtosecond element-specific, spin-sensitive microscopy at ultimate spatio-temporal scales, achieving simultaneous 18 nm spatial and 35 fs temporal resolution. This allows for a close examination of ultrafast phenomena in real space, providing, deeper insights into the puzzles surrounding ultrafast spin dynamics in the presence of nanoscale magnetic domains [2]. By optimizing the experimental conditions for static imaging, we demonstrate real-space resolutions of 13.5 nm and 12.5 nm for spin and charge scattering, using probe wavelengths close to the m-edges of Co and Ni, respectively. These results from our compact high-harmonic based microscope establish a set of new benchmarks for photon-based imaging techniques.
[1] Zayko et al., Nat. Commun. 12, 6337 (2021)
[2] Koopmans et al., Nat. Materials 9, 259-265 (2010)
Keywords: High harmonic generation; femtosecond; Microscopy; imaging; ultrafast