Dresden 2006 – scientific programme

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MA: Magnetismus

MA 33: Spin-Dynamics, Magnetization Reversal III

MA 33.8: Talk

Thursday, March 30, 2006, 17:00–17:15, HSZ 403

Magnetization dynamics triggered by photo-conductive switches — •Matthäus Pietz¹, A. Parge¹, M. Djordjevic¹, A. Förster², and M. Münzenberg¹ — ¹IV. Phys. Inst. Universität Göttingen — ²Inst. 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 pulses from a Ti:Sapphire laser for the excitation of the carriers, current pulses of a few picoseconds in length are generated. The pulses are characterised with autocorrelation technique. We demonstrate that using amplified laser pulses of 1 µJ energy we are able to create current pulses with an amplitude of 1 Ampere and 3 ps length. The field pulse can be used to trigger the magnetization dynamics in a magnetic nanostructure. Therefore, magnetic structures on a strip line with the help of e-beam lithography are prepared, 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.