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MM: Fachverband Metall- und Materialphysik
MM 72: Magnetic Shape Memory Alloys (joint with MA)
MM 72.1: Vortrag
Freitag, 16. März 2018, 09:30–09:45, TC 010
Magnetic ground state and compositional stability of epitaxial strain induced martensites in FexRh1−x thin films — •Ralf Witte1, Markus E. Gruner2,3, Richard A. Brand1,2, Di Wang1,4, Heiko Wende2, Robert Kruk1, and Horst Hahn1,5 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 3Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München — 4Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology — 5KIT-TUD-Joint Research Laboratory Nanomaterials, Technical University Darmstadt
Recently we reported on the formation of an adaptive martensite structure observed in chemically disordered, equiatomic FeRh thin films which were subject to large epitaxial strains [1]. A magnetically disordered ground state of the resulting structure was predicted from density functional theory (DFT) calculations. In this contribution we will show by means of low temperature conversion electron Mössbauer spectroscopy that the strain induced structural change leads to a magnetic spin glass state at low temperature in agreement with DFT calculations. Additionally, structural and magnetic characterization of thin films with different FexRh1−x composition will be presented. The observed magnetic and strain adaption behavior is discussed with respect to the equilibrium binary alloy phase diagram and the existing metastable phases. We acknowledge funding by the DFG via HA1344/28-1. [1] R. Witte et al., PRB 93, 104416 (2016).