Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 42: Phase Transitions III

MM 42.3: Talk

Thursday, February 28, 2008, 14:30–14:45, H 0107

Growth of epitaxial and highly textured FePd shape memory alloy thin films — •Lisa Kühnemund, Tobias Edler, and S.G. Mayr — I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

Thin films of the MSM alloy Fe₇₀Pd₃₀ are grown by e-beam evaporation. In order to achieve a maximum strain by the MSM effect, epitaxial or highly textured films are desirable. Depending on the substrate type (either MgO single crystals or amorphous SiO₂) key properties, including phase, microstructure, and magnetic characteristics have been determined. Since the stress state of a thin film is known to have a major influence not only on the matensitic transformation but also on the MSM effect itself, stress measurements on films grown by e-beam evaporation are compared to films grown by PLD. In order to influence the texture of polycrystalline films, methods of applying a magnetic field both during film growth and post-deposition annealing are evaluated. The implications of these structural and magnetic properties on the MSM effect and its possible applications are discussed.

This work has been financially supported by the DFG-SPP 1239, Project C4.