Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Spindynamics / Switching III

MA 33.1: Talk

Friday, March 30, 2007, 11:00–11:15, H23

Time-resolved magneto-optics in the sub-ps regime with a modified Sagnac interferometer — •Andreas Goris, Andreas Bauer, and Günter Kaindl — Freie Universität Berlin, Institut für Experimentalphysik

In near-field imaging of magnetic nanostructures, the Sagnac interferometer has been shown to be a powerful tool for increasing image quality and magnetic contrast [1,2]. We have carried on this successful concept to the study of magneto-optical effects on the sub-ps timescale. The system studied was a 35-ML film of Ni/Cu(100) that was heated by the light pulse from a Ti:sapphire laser. The drop in magnetization of the film in less than 1 ps and the subsequent relaxation process was followed in real time, using a pump-probe setup with a modified Sagnac interferometer and - for comparison - a conventional crossed-polarizer setup.

[1] B.L. Petersen et al., Appl. Phys. Lett. 73, 538 (1998).

[2] G. Meyer et al., Phys. Rev. B 68, 212404 (2003).

Work supported by the Deutsche Forschungsgemeinschaft, project SPP 1133.

Present address of 1st author: Max-Born-Institut, Berlin