Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 11: Ultrafast magnetism II
MA 11.9: Talk
Monday, March 12, 2018, 17:15–17:30, EB 407
All optical switching and ultrafast magnetization dynam- ics in doped FePt thin films — •Martin Stiehl1, Nataliia Safonova2, Benjamin Stadtmüller1,3, Manfred Albrecht2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany — 2Institute for Physics, University of Augsburg, Universitätsstraße 1 Nord, 86159 Augsburg, Germany — 3Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany
The speed of magnetic data storage and information processing is particularly important for device performance but presently limited to a few nanoseconds. In this regard all-optical switching (AOS) is a highly promising effect which allows to switch the magnetization within a few tens of ps.
Here, we focus on the AOS phenomena and the corresponding fs magnetization dynamics in FePt thin films doped with Tb using all optical detection schemes based on the time-resolved magneto-optical Kerr effect. For a Tb concentration of 11% and linear polarization of the optical excitation, we observe a single-shot magnetization reversal within the first ps which lasts over 20ps without indications of remagnetization. We will compare results for different Tb concentrations to gain insight into the role of the dopant for the observed magnetization reversal.