Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Magnetization / Demagnetization Dynamics II

MA 14.3: Talk

Monday, March 20, 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 Nievess^7,8, 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.