Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.56: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Spin-dependent magnetization dynamics in the Tb(0001) surface state — •Sang-Eun Lee, Beatrice Andres, and Martin Weinelt — Fachbereich Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Ultrafast laser-induced demagnetization of heavy lanthanides differs from that of transition metals, since its dynamics is described by more than one exponential time constant. Employing spin-, time- and energy-resolved photoemission spectroscopy we have studied the case of Gd(0001) [1]. With the same tool, in this study, we investigate the demagnetization of Tb when it is excited with ultrafast laser pulses. From the broadening of the Fermi function we can extract the spin-dependent temporal evolution of the electron temperature. Comparing this to the changing spin-polarization and binding energy of the Tb(0001) surface state, we are able to distinguish between different processes driving the demagnetization, such as Eliott-Yafet scattering or spin transport. To show a distinctive behavior of laser-induced demagnetization, we compare the spin-polarization and binding energy change of this process to those of the equilibrium phase transition. We further compare the magnetization dynamics of Tb and Gd.

[1] B. Andres et. al., Phys. Rev. Lett. 115 20, 207404 (2015).