Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Ultrafast Magnetization Effects I
MA 26.11: Vortrag
Mittwoch, 19. März 2025, 17:45–18:00, H16
Temperature and Magnetic Field Dependence of Ultrafast Magnetization Dynamics — •Leon Seidel1, Clemens von Korff Schmising2, Tino Noll2, Wolfgang-Dietrich Engel2, Simon Gaebel2, Daniel Metternich2, and Stefan Eisebitt1,2 — 1Technische Universität Berlin — 2Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
In this work, we present a wide-field optical microscope designed to study the temperature and magnetic field dependence of ultrafast magnetization dynamics with femtosecond temporal and micrometer spatial resolution. The compact device integrates xyz, yaw and tilt adjustments as well as a motorized sample manipulation. The sample temperature is controlled by a continuous flow cryostat in a temperature range between 20 K / 80 K and 500 K using either LN2 or LHe. An inbuilt electromagnet provides an external magnetic field of up to one Tesla.
We show first results of ultrafast all-optical magnetization switching (AOS) in ferrimagnetic rare earth-transition metal alloys. We characterize two CoTbGd films with different stochiometries and systematically examine the role of the magnetization and angular momentum compensation for AOS.
Keywords: ultrafast magnetization dynamics; all-optical switching; temperature dependency; wide-field optical microscope