Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.89: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Characterization of epitaxial Ni-Mn-Sn thin films with out-of-plane composition gradient — •Niclas Teichert1, Lars Helmich1, Svetlana Klimova1,2, Anna Behler3, Christian Behler3, Anja Waske3,4, Walid Hetaba1,5, and Andreas Hütten1 — 1Bielefeld University, Department of Physics, Thin Films and Physics of Nanostructures, 33615 Bielefeld, Germany — 2Saratov State University, Department of Nano- and Biomedical Technology, 410012 Saratov, Russia — 3IFW Dresden, Institute for Complex Materials, 01069 Dresden, Germany — 4TU Dresden, Institut für Festkörperphysik, 01062 Dresden, Germany — 5Vienna University of Technology, Universitäre Service-Einrichtung für Transmissionselektronenmikroskopie (USTEM), Wiedner Hauptstraße 8-10, A-1040 Wien, Austria
Ni-Mn-Sn is a ferromagnetic shape memory alloy and a promising magnetocaloric material. In this study we investigate epitaxial Ni-Mn-Sn thin films with out of plane gradient of e/a from 8.05 to 8.12. The gradient is applied in order to expand the temperature range of the martensitic transition. The films are prepared by magnetron co-sputtering on MgO(001) substrates. The composition gradient is realized by variation of the Sn rate during the sputter process. We see a widening of the transition range without widening of the thermal hysteresis. We compare films with increasing and decreasing e/a from substrate to surface. The applied methods to study the martensitic transition are temperature dependent resistivity and magnetization measurements, X-Ray Diffraction, and Transmission Electron Microscopy.