Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Ultrafast magnetization effects and magnetization dynamics

MA 2.5: Vortrag

Montag, 1. April 2019, 10:30–10:45, H37

Induced vs. intrinsic magnetic moments in ultrafast magnetization dynamics — •Simon Häuser1, Moritz Hofherr1,2, Simone Moretti3, Nataliia Safonova4, Henry Kapteyn5, Margaret Murnane5, Mirko Cinchetti6, Daniel Steil7, Stefan Mathias7, Benjamin Stadtmüller1,2, Manfred Albrecht4, Ulrich Nowak3, and Martin Aeschlimann11Technische Universität Kaiserslautern, Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Mainz, Germany — 3Universität Konstanz, Konstanz, Germany — 4University of Augsburg, Augsburg, Germany — 5University of Colorado, Boulder, USA — 6Technische Universität Dortmund, Dortmund, Germany — 7Georg-August-Universität Göttingen, Göttingen, Germany

Technologically important ferromagnetic alloys consisting of several magnetic sublattices exhibit often both intrinsic and induced magnetic moments. Here, we study the ultrafast response of the element-specific magnetization dynamics for thin film systems based on purely intrinsic (CoFeB) and partially induced (FePt) magnetic moments using HHG-TMOKE as an element-sensitive probe. In FePt, on the one hand, we observe an identical normalized transient magnetization for Fe and Pt throughout both the ultrafast demagnetization and the subsequent remagnetization. On the other hand, Co and Fe show a clear difference in the asymptotic limit of the remagnetization process in CoFeB. This observation is supported by calculations for the temperature-dependent behavior of the equilibrium magnetization using a dynamic spin model [1]. [1] Phys. Rev. B 98, 174419 (2018)

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