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MA: Fachverband Magnetismus
MA 21: Ultrafast Magnetization II
MA 21.13: Vortrag
Dienstag, 17. März 2020, 12:45–13:00, HSZ 101
All Optical Switching in FePtCr Alloys — •Stephan Wust1, Martin Stiehl1, Nataliia Schmidt2, Ritwik Mondal3, Benjamin Stadtmüller1,4, Ulrich Nowak3, Manfred Albrecht2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern — 2Institute for Physics, University of Augsburg, Universitätsstraße 1 Nord, 86159 Augsburg, Germany — 3Universität Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany — 4Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
The speed of magnetic data storage and information processing technologies is particularly important for magnetic device performances but currently limited to a few nanoseconds. In this regard, all-optical switching (AOS) is a highly promising effect to overcome this limit. Here, we focus on the AOS phenomena and the corresponding fs magnetization dynamics in L10 ordered FePt thin films doped with Cr. For investigating the effect of optical excitation, we employ magneto-optical-effects to image the optically induced change of magnetic domains in real space. For a Cr concentration of 5%, we observe a helicity-dependent switching. Since this effect happens with an efficiency below 100%, parameters like sample thickness and temperature are systematically varied to optimize the switching process. We compare this experimental finding for different Cr concentrations to gain insight into the role of the dopant for the observed magnetization reversal. Our results are an important step towards a deeper understanding of AOS in FePt based materials.