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DS: Fachverband Dünne Schichten
DS 44: Magnetic Coupling and Anisotropy in Thin Films (joint session MA/DS)
DS 44.1: Vortrag
Freitag, 20. März 2020, 09:30–09:45, HSZ 04
Imaging of ultrafast spin dynamics using high-harmonic radiation — •Sergey Zayko1, Ofer Kfir1, Michael Heigl2, Michael Lohmann1, Jakob Hagen1, Murat Sivis1, Manfred Albrecht2, and Claus Ropers1 — 1IV Physical Institute, University of Göttingen — 2Experimental physics IV, University of Augsburg
The demand for next-generation information processing methodologies increases the interest in spintronic devices, as they may offer energy-efficient operation at THz frequencies [1,2]. Such developments require means for tracking of magnetic dynamics with nanoscale resolution and a temporal precision well below a picosecond, as highlighted in a first experimental effort [3]. Here we utilize MCD (magnetic circular dichroism) imaging with high-harmonic radiation [4] for the mapping of spin-texture dynamics. Our experiment captures magnetic movies with a combined 40 nm spatial- and 40 femtosecond temporal resolutions, and images with resolution better than 20 nm. We use these capabilities to follow the ultrafast responses of magnetic domains in materials with perpendicular magnetic anisotropy, such as local ultrafast demagnetization and non-local dynamics near domain walls. We believe that our approach will yield deeper insights into the corresponding physics of the ultrafast magnetism and become an indispensable tool for applied research.
[1] A. Fert, V. Cros, and J. Sampaio, Nat Nano 8, 152 (2013). [2] Nature Nanotech 10, 185 (2015). [3] C. von Korff Schmising et al., Phys. Rev. Lett. 112, 217203 (2014). [4] O. Kfir, S. Zayko et al., Science Advances 3, eaao4641 (2017).