Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.27: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Wavelength-dependent 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 Baerbel Rethfeld1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany
For a long time, the ultrafast magnetization dynamics of ferromagnets has predominantly been studied for optical excitation using only one photon energy. However, recent experiments have shown that the dynamics of the demagnetization and remagnetization process can be altered by the wavelength of the exciting laser pulse [1, 2].
In this contribution, we extend the temperature-based µT-model to investigate the ultrafast magnetization dynamics of Ni|Au heterostructures. Our model is based on realistic densities of states of both materials and includes energy and spin transfer at the interface. Thereby, we explicitly consider the wavelength- and layer-dependent absorption profile within multilayer structures. This allows us to show the influence of the wavelength-dependent excitation on the magnetization dynamics [3], which is also affected by the substrate thickness.
References:
[1] V. Cardin et al., Phys. Rev. B 101, 054430 (2020)
[2] U. Bierbrauer et al., JOP: Cond. Mat. 29, 244002 (2017)
[3] C. Seibel et al., arXiv:2112.04780 (2021)