Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Ultrafast Magnetization III

MA 30.8: Talk

Wednesday, March 18, 2020, 11:30–11:45, HSZ 101

Microscopic theory for the real-time magnetization dynamics in bilayers driven by ultrafast laser pulses — •Hanan Hamamera, Filipe Souza Mendes Guimaraes, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany

Spintronic, magnetic and optical properties of different materials can be manipulated by ultrashort laser pulses [1,2]. Here we present our recently-developed method to investigate ultrafast spin dynamics: Employing a realistic tight-binding Hamiltonian parametrized from first-principles electronic structure calculations, we directly solve for the real-time evolution of the electronic state of a chosen system. We apply this method to different metallic bilayers, such as Fe/W(110) and Co/Pt(001), focusing on how the magnetization dynamics is influenced by its initial orientation and how it relates to the polarization of the driving laser pulse. We also investigate whether a pumping protocol involving a second laser pulse may lead to improved switching, inspired by the experiments of Ref. [3].
This work was supported by the Palestinian-German Science Bridge BMBF program and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC-consolidator Grant No. 681405-DYNASORE).
[1] T. Seifert et al., Nature Photon. 10, 483-488 (2016)
[2] J. Chen et al., Phys. Rev. Lett. 122, 067202 (2019)
[3] K. T. Yamada et al., arXiv:1903.01941 (2019)