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MA: Fachverband Magnetismus

MA 25: Magnetic Shape Memory Alloys II (jointly with MM)

MA 25.6: Talk

Tuesday, March 15, 2011, 14:45–15:00, HSZ 103

Phase transformations and mechanical properties of freestanding single crystalline Fe₇₀Pd₃₀ thin films — •Y. Ma^1,2, F. Szillat^1,2, D. Manova¹, S. Mändl¹, J. W. Gerlach¹, and S. G. Mayr^1,2 — ¹Leibniz-Institut fuer Oberflaechenmodifizierung — ²Translationszentrum fuer Regenerative Medizin und Fakultaet fuer Physik und Geowissenschaften, Universitaet Leipzig, 04318 Leipzig

Ferromagnetic shape memory alloys have attracted significant scientific interest recently due to their high potential for actuators in microsystems. Recently, freestanding single crystalline Fe₇₀Pd₃₀ thin films became available, which can be transformed to the desired fct phase by annealing treatment [1]. We show, that by raising the deposition temperature to 850 ^∘C or higher, room temperature single crystal fct Fe-Pd films are readily prepared without post-annealing treatment. Scanning electron microscopy and atom force microscopy images reflect the twin structure of martensite. The transformation temperature from fct martensite to fcc austenite at about 53 ^∘C was confirmed independently by temperature dependent x-ray diffraction and magnetization measurements. The films were released from the substrates by chemically dissolving the MgO, while the crystal structure, phase and composition of these films are kept intact. The Young’s modulus of as prepared and freestanding Fe-Pd films was determined by nanoindentation with a Berkovich tip in quasi continuous stiffness method.
This project is funded by the German BMBF, PTJ-BIO, Grant Number: 0313909.
T. Edler and S. G. Mayr, Adv. Mat. (in press, 2010).