Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Magnetization Dynamics I
MA 22.4: Talk
Wednesday, April 2, 2014, 10:15–10:30, HSZ 401
The Janus face of Gadolinium: different timescales for itinerant and localized magnetism — •Björn Frietsch1,2, Robert Carley1,2, Martin Teichmann1,2, John Bowlan1,2, and Martin Weinelt1,2 — 1Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany — 2Max Born Institut, Max-Born-Straße 2a, 12489 Berlin, Germany
We present results of experiments from ultrafast laser-driven magnetization dynamics on the rare-earth local-moment ferromagnet Gadolinium. We use high order harmonic radiation to perform time- and angle- resolved photoemission spectroscopy [1].
With this technique it was possible to map the non-equilibrium band structure after excitation of the ferromagnet by a short infrared laser pulse and simultaneously follow the magnetic evolution of the 4f core level using magnetic linear dichroism.
The magnetization dynamics of the valence electrons and the 4f spins are strikingly different. While we observe subpicosecond demagnetization of the valence electronic system [2], the 4f core level exhibits a time constant of about 13ps.
[1] B. Frietsch, R. Carley, K. Döbrich, C. Gahl, M. Teichmann, O. Schwarzkopf, P. Wernet, and M. Weinelt Rev. Sci. Instrum. 84, 075106 (2013)
[2] R. Carley, K. Döbrich, B. Frietsch, C. Gahl, M. Teichmann, O. Schwarzkopf, P. Wernet, and M. Weinelt Phys. Rev. Lett. 109, 057401 (2012)