Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.6: Poster

Wednesday, March 16, 2011, 17:15–18:45, P5

Epitaxy, lift-off and surface treatment of Ni-Mn-Ga based magnetic shape memory alloy films — •Marcus Müller and S. G. Mayr — Leibniz-Institut für Oberflächenmodifizierung, Translationszentrum für regenerative Medizin und Fakultät für Physik und Geowissenschaften der Universität Leipzig, 04318 Leipzig

During the past years much progress has been achieved in the field of magnetic shape memory alloys. The Ni-Mn-Ga alloy is presumably the most prominent representative, which can yield strains as high as 10% in highly tailored single crystals. Freestanding miniaturized single crystalline films on the other hand are much less explored and face several challenges, particularly including single crystalline growth and film lift-off. Using magnetron sputtering from Ni-Mn-Ga compound target we fabricate single-crystalline-like epitaxial Ni-Mn-Ga films on a heated MgO (100) substrate, which transform to the martensite phase upon cooling down to room temperature [1]. A recently-developed etching technique [2] for direct removal of the MgO substrate is subsequently employed for lifting these films off the substrate, which is currently being optimized further. As a main advantage the present approach does not require buffer layers, which would possibly prove harmful at the elevated temperatures employed for epitaxy. With the aim of enhancing biocompatibility, coating concepts are furthermore explored.

[1] G. Mahnke, M. Seibt, S.G. Mayr, Phys. Rev. B 78, 012101 (2008)

[2] T. Edler, S.G. Mayr, Adv. Mat. (in press, 2010)

This project is funded by the German BMBF, PTJ-BIO, Grant Number: 0313909.