Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.66: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Ultrafast photo-conductive switches — •M. Pietz¹, S. Bretschneider¹, A. Parge¹, T. Salditt², A. Förster³, and M. Münzenberg¹ — ¹4. Phys. Institut Universität Göttingen — ²Institut für Röntgenphysik Universität Göttingen — ³Institut für Schichten und Grenzflächen (ISG1) Forschungszentrum Jülich

Ultrafast photoconductive switches, based on metal-semiconductor-metal contact pads using low temperature grown GaAs as a semiconductor, deliver the fastest current pulses on a chip so far. Using fs-laser pulses from a TiSa-laser system for the excitation of the carriers, current pulses of a few picoseconds (2-3 ps) in length are generated. The pulses are characterised with autocorrelation and photoconductive sampling techniques. The field pulse in the order of 10 Oe can be used to trigger the magnetization dynamics in a magnetic nanostructure. Therefore, magnetic structures on a strip line are prepared with the help of optical and e-beam lithography, with the aim to explore magnetic Eigen mode oscillations and extrinsic as well as intrinsic damping parameters in a pump-probe experiment with ps time resolution.