Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Magnetization and Demagnetization Dynamics II
MA 31.1: Vortrag
Mittwoch, 9. März 2016, 09:30–09:45, H34
Driving spins in magnetic storage FePt by all optical switching — •Robin John1, Cai Mueller2, Dagmara Butkovicova3, Eva Schmoranzerova3, Pablo Nieves4, Tiffany Santos5, Jakob Walowski1, Oksana Chubykalo-Fesenko4, Jeffrey McCord2, and Markus Muenzenberg1 — 1Institute for Physics, Ernst-Moritz-Arndt-University, Greifswald, Germany — 2Institute for Materials Science, Kiel University, Germany — 3Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic — 4Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain — 5San Jose Research Center, HGST, a Western Digital Company, San Jose, USA
Magnetization manipulation is an indispensable tool for both basic and applied research. Following the work of Lambert et al., we investigate the fluence dependence of all-optical switching. In our work we use a Coherent RegA system to write the patterns with a high repetition rate of 250 kHz with a temporal width of 40 fs. We are able to switch deterministically from the demagnetized ground state back and forth using the two circular polarizations of the laser. We have also tried to find the mechanism of magnetization switching upon the interaction with circular femtosecond laser pulses by comparing the contrast profiles (from Kerr microscopy images) with simulations of spatial profile of the electronic temperature of the system within a range of fluences. We had also conducted ultrafast dynamics experiment using Time-Resolved Magneto Optical Kerr set-up by using the two circular polarizations states of the laser to trace the mechanism.