Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 13: Magnetic Materials

MA 13.2: Talk

Monday, March 26, 2012, 15:15–15:30, H 0112

Femtosecond infrared and x-ray annealing of magnetic multilayers — •Stefan Schaffert, Jan Geilhufe, Christian Günther, Jyoti Mohanty, Bastian Pfau, and Stefan Eisebitt — IOAP, Technische Universität Berlin, Germany

We have studied the influence of single and multi-shot femtosecond annealing of magnetic Co/Pt multilayers using infrared and x-ray pulses. Prior to annealing the multilayers have been demagnetized using in-plane or out-of-plane external magnetic fields thus conditioning stripe or maze domain patterns with magnetization normal to the sample surface. We performed annealing series employing a Ti:Sa Laser at 800 nm at different fluences and observed irreversible changes in the average domain size.
We compare the optical annealing experiments with results obtained by annealing identical samples with high-power shots of the free-electron Laser FLASH at Hamburg operating at 20.8 nm wavelength, e.g. the cobalt M absorption energy. The thermally induced changes were investigated with respect to the magnetic anisotropy (via MOKE) and the resulting domain patterns (via MFM).