Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.19: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Ultrafast demagnetization dynamics in an FePtMn alloy — •Cinja Seick1, Ute Bierbrauer2, Moritz Hofherr2, Nataliia Safonova3, Manfred Albrecht3, Benjamin Stadtmüller2, Martin Aeschlimann2, Daniel Steil1, and Stefan Mathias1 — 1I. Physikalisches Institut, Universität Göttingen, Germany — 2Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Germany — 3Institute of Physics, University of Augsburg, Germany
The speed and efficiency of ultrafast magnetization dynamics is known to depend on the interplay of the electron, spin, and lattice system in combination with the magnetic moments and the exchange interaction. In order to study the influence of the exchange interaction, one approach is to study alloys with varying with varying stoichiometry and hence exchange coupling between different magnetic constituents.
In our work, we chose a sample system with two magnetic sub-lattices with varying contributions, namely the alloy [FePt]1−χ Mnχ, which we study with the time-resolved magneto-optical Kerr effect. In this material system, we consistently find a peculiar speed-up of the average demagnetization time at intermediate pump fluencies. In order to understand this process, we use a modified microscopic three temperature model with two interacting spin systems.
We will present experimental results and first simulations.