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MA: Fachverband Magnetismus
MA 9: Ultrafast Magnetization Effects II
MA 9.11: Talk
Monday, March 18, 2024, 18:00–18:15, H 2013
Real-space imaging of ultrafast dynamics in nanoscale magnetic domains — •Hung-Tzu Chang1, Sergey Zayko1, Timo Schmidt2, Murat Sivis1,3, Manfred Albrecht2, and Claus Ropers1,3 — 1Max Planck Institute for Multidisciplinary Sciences, 37077 Goettingen, Germany — 2Experimental Physics IV, Institute for Physics, University of Augsburg, 86159 Augsburg, Germany — 3IV Physical Institute, University of Goettingen, 37077 Goettingen, Germany
Direct visualization of photoinduced dynamics of nanoscale spin textures is crucial for understanding the mechanisms of ultrafast demagnetization and all-optical magnetic switching. Here, we image the real-space response of magnetic domains in optically excited Co-based magnetic thin films with circularly polarized femtosecond extreme ultraviolet pulses [1]. Our experiment provides direct observations of domain wall dynamics at picosecond timescales, as well as the photoinduced disappearance of small domains, which should further advance the understanding of spin dynamics in nanomaterials.
[1] Zayko et al. Nat. Commun. 12, 6337 (2021)
Keywords: ultrafast demagnetization; domain wall dynamics; magnetic circular dichroism; coherent diffractive imaging