Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 48: Joint Session Magnetic Shape Memory Alloys I (jointly with DS, MA)

MM 48.4: Vortrag

Donnerstag, 29. März 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. Mayr^1,2 — 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).