Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Magnetization Dynamics I

MA 22.12: Vortrag

Mittwoch, 2. April 2014, 12:30–12:45, HSZ 401

Spin-resolved photoelectron spectroscopy using femtosecond extreme ultraviolet light pulses — •Moritz Plötzing, Roman Adam, Christian Weier, Lukasz Plucinski, and Claus M. Schneider — Peter Grünberg Institut (PGI-6), Research Center Jülich, 52425 Jülich, Germany

The ongoing discussion about the physical mechanism responsible for femtosecond magnetization dynamics raise the demand for new experimental techniques capable of accessing fundamental properties of ferromagnetic materials, e.g. by investigating the ultrafast evolution of the spin-resolved band structure. Our work focusses on a combination of highly efficient spin detection in a photoemission spectroscopy (PES) experiment and a femtosecond laser-driven extreme ultraviolet (XUV) light source. Using the ultrashort XUV pulses, we measured spin-resolved PES spectra of thin Co films grown in-situ on Cu(100). By a comparison of these results with spectra obtained using a continuous-wave He discharge lamp, we identified important differences due to the excitation with the XUV source. Furthermore, we found that the spectra measured using the pulsed XUV source allow the extraction of important magnetic properties including the exchange splitting. The necessary acquisition times are fully suited for time-resolved experiments employing a pump-probe scheme.