Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Postersession I
MM 17.12: Poster
Monday, March 16, 2015, 18:00–20:00, Poster E
Probing magnetic phase transitions in Heusler-alloys and Magnetite using EMCD — •Walid Hetaba1,2, Stefan Löffler1, Michael Stöger-Pollach1, Andreas Hütten3, Gareth Parkinson4, Marc-Georg Willinger2, and Robert Schlögl2 — 1USTEM, Vienna University of Technology, Austria — 2Department of Inorganic Chemistry, Fritz Haber Institute of the MPG, Berlin, Germany — 3Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, Germany — 4Institute of Applied Physics, Vienna University of Technology, Austria
Energy-loss magnetic chiral dichroism (EMCD) is a versatile technique to investigate magnetic properties on the nanoscale. Heusler-alloys and Magnetite are promising systems in the field of spintronics. Furthermore, multilayer Heusler systems are used for ferroic cooling applications. These alloys show an austenitic-martensitic phase transition, where the transition temperature depends on the actual elemental composition. Magnetite shows a Verwey transition at about 120 K. In this work, we perform in-situ EMCD measurements to investigate the changes of the magnetic properties at different temperatures. The experimental results are found to be in very good agreement with simulations. These simulations are crucial as dynamical diffraction affects the intensity of the measured EMCD signal, bringing the sample thickness into the game. By combining theory and experiments, this study paves the way for tailoring the magnetic phase transition of materials for the use in spintronics. The Austrian Science Fund is acknowledged for financial support under grant numbers F4501-N16 and I543-N20.