Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.10: Poster

Wednesday, March 18, 2020, 15:00–18:00, P3

Spin-wave packets triggered by ultrashort laserpulses — •Tobias Tubandt¹, Justyna Rychly², Jakob Walowski¹, Christian Denker¹, Jaroslav Klos², and Markus Münzenberg¹ — ¹Institute of Physics, University Greifswald, Germany — ²Faculty of Physics, Adam Mickiewicz University Poznań, Polen

The theoretical foundations to magnons and spin-waves has already been established in 1940 by Felix Bloch, yet magnonics itself remains a vivid research field. The advance in nanotechnology and the development of experimental techniques to analyse magnetization dynamics in the recent years bring a growing interest in the search for technologies, which utilize spin-waves to store, carry and process information. We investigate broadband excitations of spin-wave packets by ultrashort laser pulses in magnonic antidot crystals and one-dimensional stripe patterns varying the stripe broadness. The propagation distance in the antidot lattices depends on the direction of the applied magnetic field as well as the surface geometry of the crystal. Additionally, spatially resolved magnetization dynamics measurements on thin CoFeB films reveal that the frequencies of resulting spin-wave modes depend strongly on the distance to the pump center, due to the laser generated temperature profile, which leads to a 0.5 GHz shift in the spin-wave frequency and persists for up to one nanosecond. For the stripe patterns, micromagnetic simulations predict a distance dependent frequency shift. This behavior can be confirmed experimentally.