SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.8: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Laser-induced ultrafast magnetization dynamics in Ni|Au heterostructures — •Stephanie Roden1, Christopher Seibel1, Marius Weber1, Martin Stiehl1, Sebastian T. Weber1, Martin Aeschlimann1, Benjamin Stadtmüller1,2, Hans Christian Schneider1, and Bärbel Rethfeld1 — 1Department of Physics and Research Center OPTIMAS, RPTU, Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Studying the optically induced magnetization dynamics of heterostructures has provided clear insights into the particle and energy transport effects on ultrafast timescales. This understanding leads to new concepts to control the magnetization dynamics by tuning the wavelength of optical excitation [1, 2, 3].
In this contribution we demonstrate how the magnetization dynamics of Ni|Au heterostructures can also be controlled by the thickness of the non-magnetic gold layer. Our conclusions are based on an extended temperature-based µT-model which includes the thickness-dependent absorption profile. We find that thin gold films slow down the demagnetization process of nickel while the demagnetization times decrease again for larger gold film thicknesses. Furthermore we consider transport effects within the gold layer and demonstrate the dependence of the induced spin polarization into the substrate on the considered depth in the substrate.
[1] V. Cardin et al., Phys. Rev. B 101, 054430 (2020)
[2] M. Stiehl et al., Appl. Phys. Lett. 120, 062410 (2022)
[3] C. Seibel et al, Phys. Rev. B 106, L140405 (2022)