Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Magnetization Dynamics II
MA 29.8: Vortrag
Mittwoch, 2. April 2014, 17:00–17:15, HSZ 401
Microscopic electronic configurations during ultrafast magnetisation dynamics — Inka Locht1, Igor Di Marco1, Silvano Garnerone2, Raghuveer Chimata1, Anna Delin1, Olle Eriksson1, and •Marco Battiato1,3 — 1Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden — 2Institute for Quantum Computing, University of Waterloo, Waterloo, Canada — 3Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria
Recent experiments [1,2] have shown the new possibility of generating an increase of magnetisation in Fe upon direct injection of spin from a neighbouring layer. This reopens the unsolved question about the microscopical configuration after ultrafast magnetisation dynamics, requiring an answer that addresses both dynamics on equal footing.
We provide a model for the description of the electronic and magnetic configurations of ferromagnetic Fe undergoing both ultrafast decrease and increase of magnetization. The model is based on the assumption that after the the ultrafast magnetization change is complete the system has achieved a local thermodynamic equilibrium. With statistical arguments it is possible to show that the magnetic configurations in the case of reduced or increased magnetic moment are qualitatively different. The predicted magnetic configurations are then used to compute T-MOKE spectra at the 3p (M) absorption edges which are in excellent agreement with the existing experiments.
[1] Rudolf et al., Nat. Commun. 3, 1037 (2012) [2] Turgut et al., Phys. Rev. Lett. 110, 197201 (2013)