Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.6: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Electron-phonon scattering in Ni studied by temperature dependent RIXS. — •Artur Born, Régis Decker, Robby Büchner, Anette Pietzsch, and Alexander Föhlisch — Helmholtz Zentrum Berlin

In order to study electron-phonon interaction, we measured electron-phonon scattering rates in nickel, using temperature dependent Resonant Inelastic X-ray Scattering (RIXS). By exciting the electrons into the continuum, we created 2p core holes and observed the radiative decay from s and/or d orbitals. By changing the temperature, we created a controlled amount of phonons and got a direct access to the electron-phonon scattering rate in the valence band. We could observe a temperature dependent loss of intensity in the valence to p1/2 decay, which indicates an angular momentum transfer between the valence electrons and the lattice. The angular momentum transfer by electron-phonon scattering was proposed as a main channel for ultrafast spin dissipation, the so-called Elliott-Yafet (EY) scattering in order to explain ultrafast demagnetization processes [1]. In this study, we present a new approach to get access to the EY scattering only, and eliminate laser-induced components of the demagnetization process like super-diffusive spin transport or optical spin manipulations.

[1] B. Koopmans et.al. Explaining the paradoxical diversity of ultrafast laser-induced demagnetization. Nature Mat. 9, 259-265, (2009).