Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 19: SYM Thin Film Magnetic Materials: Microstructure, Reaction and Magnetic Coupling II
MM 19.3: Hauptvortrag
Dienstag, 26. Februar 2008, 12:30–13:00, H 0107
Solid state reactions at the interface of Heusler alloy films — •Hans-Joachim Elmers1, Andres Conca1, Tobias Eichhorn1, Andrei Gloskovskii2, Kerstin Hild1, Gerhard Jakob1, Martin Jourdan1, and Michael Kallmayer1 — 1Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany — 2Institut für Anorganische und Analytische Chemie Johannes Gutenberg-Universität, D-55099 Mainz, Germany
Magnetic and structural properties on a nanoscale are of vital interest for data storage and actuator applications of magnetic thin films. Half-metallic Heusler alloy films offer new routes for the development of devices based on spin transfer mechanisms. Ferromagnetic shape memory alloy films provide potential applications exploiting their huge magnetically induced length change. The control of interface properties of these complex alloys is crucial for future applications. We show that x-ray absorption spectroscopy can be used as an efficient tool for the determination of element-specific magnetic and structural properties both in the bulk and at buried interfaces. We present results for the variations of orbital and spin moments at the martensitic phase transition of Ni2MnGa. As an example for the modification of interface properties, we present results on the solid-state reaction at the interface of Heusler alloys and Al. Micro-spectroscopy using photoemission electron microscopy (PEEM) reveals an inhomogeneous interface reaction with reaction nuclei separated on a micron length scale.