Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Magnetization / Demagnetization Dynamics II
MA 14.3: Vortrag
Montag, 20. März 2017, 15:30–15:45, HSZ 401
All optical Switching of magnetization on FePt nanoparticle using ultrafast lasers: A rate theory approach for the mechanism — •Robin John1, Marco Beritta2, Denise Hinzke3, Cai Mueller4, Tiffany Santos5, Henning Ulrichs6, Jakob Walowski1, Ritwik Mondal2, Oksana Chubykalo-Fesenko7, Pablo Nievess7,8, Jeffrey McCrod4, Peter M Oppeneer2, Ulrich Nowak3, and Markus Muenzenberg1 — 1Institut fur Physik, Felix-Hausdorffstrasse-6, Ernst-Moritz-Arndt Universitat Greifswald, Germany — 2Department of Physics and Astronomy, Uppsala University, P. O. Box 516, SE-75120, Uppsala, Sweden — 3Department of Physics, University of Konstanz, Konstanz, Germany — 4Institute for Materials Science, Kiel University, Germany — 5Western Digital Corporation, San Jose, California, USA — 6I. Phys. Institut, Georg-August-University Goettingen, Germany — 7Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, Spain — 8ICCRAM, Universidad de Burgos, Burgos, Spain
Ultrafast Magnetization dynamics and all optical switching has been attracting the attention for a few years. Our work emphasizes the fact that the switching of magnetization on FePt granular medium is not merely thermally driven by laser induced heating, but also with a major contribution from helicity dependence in the form of inverse Faraday effect and magnetic circular dichroism. We show both experimentally and theoretically that the magnetization switching is a stochastic process. We have developed a complete multi-scale model to describe helicity dependent AOS in FePt nanoparticle recording medium.