Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Magnetic Shape Memory Alloys I

MA 21.2: Vortrag

Mittwoch, 25. März 2009, 10:30–10:45, HSZ 103

Stress relaxation and structure of vapor deposited FePd MSM films — •Tobias Edler, Lisa Kühnemund, and Stefan Georg Mayr — I. Physikalisches Institut, Georg-August-Universität Göttingen

The magnetoelastic properties of magnetic shape memory alloy thin films are fundamentally affected by the microstructure. For optimum performance epitaxial films are desirable, which requires a detailed understanding of processing parameters and their impact on film morphology. In the present contribution, we focus on Fe₇₀Pd₃₀ epitaxial films, which have been grown by vapor deposition on MgO single crystal substrates, both with and without the presence of an additional ion beam during film growth. A key parameter for epitaxial growth proves to be the stresses inside the film, as measured in situ with a laser-beam deflection method during film growth. Together with high-resolution TEM studies, these experimental results are compared to molecular dynamics simulations of the stress relaxation to track down the underlying atomic mechanisms. Funded by the DFG-SPP 1239 (C4)