Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 27: Spin-Dynamics, Magnetization Reversal II
MA 27.1: Vortrag
Donnerstag, 30. März 2006, 10:15–10:30, HSZ 403
Time-resolved photoelectron emission microscopy after optical ps-excitation — •Klaus Schmalbuch1, Reza Ghadimi1, Bernd Beschoten1, Gernot Güntherodt1, Jörg Raabe2, and Christoph Quitmann2 — 1II. Physikalisches Institut, RWTH Aachen and Virtual Institute of Spin Electronics VISel, Templergraben 55, 52056 Aachen, Germany — 2Swiss Light Source, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
In the last years photoelectron emission microscopy (PEEM) has been established as a powerful technique to image magnetic domains in magnetic nano-structures with high spatial resolution (<100 nm).
For studies of ultrafast magnetization dynamics such as precessional switching we have realized a novel time-resolved PEEM setup. A ps-laser pulse either causes an ultrafast excitation of a non-equilibrium carrier population or can act as a heating pulse. The resulting precessional dynamics can be probed by time-resolved PEEM using magnetic circular dichroism. The main experimental achievements are: (1) temporal overlap between the laser pump pulse and the synchrotron probe pulse and (2) spatial overlap of both, controlled by laser-induced 2-photon-photoemission. First time-resolved experiments have been performed on GaAs at room temperature. This method promises to monitor magnetization dynamics in exchange coupled magnetic multilayer systems.
Supported by DFG-SPP 1133 and by HGF