Berlin 2012 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 48: Joint Session Magnetic Shape Memory Alloys I (jointly with DS, MA)
MM 48.4: Talk
Thursday, March 29, 2012, 11:00–11:15, H 0106
Freestanding single crystalline Fe-Pd ferromagnetic shape memory membranes: structural, morphological and magnetic characterization — •Yanhong Ma1, A. Setzer3, J. W. Gerlach1, F. Frost1, P. Esquinazi3, and S. G. Mayr1,2 — 1Leibniz-Institut für Oberflächenmodifizierung e.V., 04318 Leipzig — 2Translationszentrum für Regenerative Medizin und Fakultät für Physik und Geowissenschaften, Universität Leipzig — 3Faculty of Physics and Earth Sciences, Institute for Experimental Physics II, Division of Superconductivity and Magnetism, Universität Leipzig
Miniaturized single crystalline Fe70Pd30
ferromagnetic shape memory alloy membranes in the correct fct phase are synthesized by employing molecular beam epitaxy on MgO (001) substrates at deposition temperatures of 850∘C and higher without post-annealing treatment. Atomic force microscopy images of these martensitic Fe-Pd thin films directly reflect formation of twin structure on the surface and reveal, how martensite variants grow. Martensitic phase transformation in the freestanding thin films is investigated with temperature dependent x-ray diffraction and magnetometry using a superconducting quantum interference device. The XRD patterns measured at various temperatures for freestanding martensitic Fe-Pd thin films show reversible (fct-fcc) and irreversible (bcc/bct-fcc) structural transformations.
This project is funded by the Leipzig Graduate School of Natural Sciences "Building with Molecules and Nano Objects" through the German Science Foundation (DFG), as well as by the German Federal Ministry of Education and Research (BMBF, PTJ-BIO, 0313909).