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Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 25: Ultrafast Magnetization Effects 2

MA 25.8: Talk

Wednesday, September 7, 2022, 16:45–17:00, H43

Ultrafast magnetization dynamics in heterogeneous material compositions — •Sebastian T. Weber1, Christopher Seibel1, Marius Weber1, Martin Stiehl1, Sanjay Ashok1, Simon Häuser1, Martin Aeschlimann1, Hans Christian Schneider1, Benjamin Stadtmüller1,2, and Baerbel Rethfeld11Department of Physics and Research Center OPTIMAS, TU Kaiserslautern — 2Institute of Physics, Johannes Gutenberg University Mainz

Ultrafast magnetization dynamics plays a key role in the development of spintronic devices. The dynamics are influenced by the composition of material systems as well as the wavelength of the optical excitation. The latter can create spatially inhomogeneous excitation profiles in thick nickel films [1,2] or Ni|Au heterostructures [3].

In this contribution, we compare results of the thermodynamic µT-model with kinetic Boltzmann calculations and MOKE-measurements to investigate the influence of the wavelength on magnetization dynamics in different compositions. Our results show that laser and material parameters can enhance or hinder the interplay of relaxation processes, leading to different laser-induced magnetization dynamics.

[1] U. Bierbrauer et al., JOP: Cond. Mat. 29, 244002 (2017)
[2] S. Ashok et al., Appl. Phys. Lett. 120, 142402 (2022)
[3] C. Seibel et al., arXiv:2112.04780 (2021)

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