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O: Fachverband Oberflächenphysik

O 37: Poster Session III: Surface magnetism III

O 37.2: Poster

Dienstag, 2. März 2021, 10:30–12:30, P

Wavelength-dependent magnetization dynamics in Ni|Au bilayers — •Christopher Seibel, Marius Weber, Sebastian T. Weber, Hans Christian Schneider, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Kaiserslautern, Germany

Existing experimental and theoretical studies of ultrafast demagnetization in ferromagnets rely mostly on only one fixed wavelength to excite the sample. However, recent experiments indicate that the dynamics of the demagnetization and remagnetization process depend on the wavelength of the exciting laser pulse [1, 2].

In this contribution, we apply the temperature-based µT-model to investigate the magnetization dynamics of a thin nickel layer on a gold substrate. Our model relies on realistic densities of states of both materials and includes energy and spin transfer at the interface. Additionally, we focus on the absorption of the exciting laser by calculating a spatially resolved absorption profile of the sample. We show the influence of wavelength-dependent excitation on the magnetization dynamics based on the energy deposition and energy transfer in the layers.

References:

[1] V. Cardin et al., Phys. Rev. B 101, 054430 (2020)

[2] U. Bierbrauer et al., JOP: Cond. Mat. 29, 244002 (2017)