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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.52: Poster

Freitag, 15. März 2013, 10:30–13:30, Poster D

Comparing the ultrafast demagnetization of Gadolinium and Terbium — •Martin Teichmann^1,2, Robert Carley^1,2, Björn Frietsch^1,2, Kristian Döbrich^1,2, Jan Wolter^1,2, John Bowlan^1,2, and Martin Weinelt^1,2 — ¹Freie Universität Berlin — ²Max-Born-Institut Berlin

The laser-driven ultrafast demagnetization dynamics of the rare earths gadolinium and terbium show distinct behavior. We performed time- and angle-resolved photoemission experiments using high-order harmonics on Gd and Tb, revealing the occupied band structure in the 3rd Brillouin zone. By following the time evolution of the spin-split valence bands individually, we are able to separate the different effects acting during demagnetization, namely spin transport and electron-phonon scattering, while simultaneously monitoring the magnetization via the exchange splitting.

We see that the dynamics of the electron-phonon scattering is very similar in Gd and Tb, while the spin transport accounts for their differences.