SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.9: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Optical manipulation of magnetic order parameter in magentic insulators by ultrashort laser pulses — •Paul Herrgen1, Benjamin Stadtmüller1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
Magnetic insulators are highly intriging materials for high performance and sustainable magnetic storage technology. However, the existance of a band gap of several eV makes it rather challenging to optically manipulate these materials on an ultrafast, fs timescale.
Here, we used strong fs laser pulses with high photon energies to optically overcome this bandgap.
Using a second ultrashort laser pulse, we were able to measure the dynamics of the magnetic order parameter of this insulator in a time-resolved manner.
We find that the optical excitation leads to a fast reduction of the magnetic order on a subpicosecond time scale.
In addition, the remagnetization process takes more than 100ps to fully return to the initial magnetic ground state.