Dresden 2011 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 31: Postersitzung II
MM 31.43: Poster
Wednesday, March 16, 2011, 17:15–18:45, P5
TEM Investigations on NiMnInCo and Fe70Pd30 Ferromagnetic Shape Memory Alloys — •Burak Erkartal1, Andriy Lotnyk1, Viola Duppel2, Robert Niemann3, Christoph Bechtold4, Christiane Zamponi4, Sebastian Fähler3, Ludwig Schultz3, Eckhard Quandt4, and Lorenz Kienle1 — 1Synthesis and Real Structure, CAU Kiel, Kaiserstr. 2, 24143 Kiel — 2Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart — 3IFW Dresden, P. O. Box 270116, 01171 Dresden — 4Inorganic Functional Materials, CAU Kiel, Kaiserstr. 2, 24143 Kiel
NiMnInCo meta-magnetic shape memory alloys have attracted considerable interest because they can be utilized for the magnetocaloric effect. Here we focus on TEM investigations of an epitaxially grown NiMnInCo thin film sputtered on (001) oriented MgO substrate with Cr buffer layer. Besides the presence of 6M, 7M modulated martensites, structural analysis by precession electron diffraction confirm also a non-modulated tetragonal phase. EDX elemental maps recorded on a cross-section indicate defects of the Cr buffer layer at the interface. Additionally, columnar regions with lower In content were observed. Further interest was concentrated on Fe70Pd30 due to the exceptional strain in response to a variation of a moderate magnetic field. Fe70Pd30 was deposited by magnetron sputtering on (001) MgO substrates coated with different metallic buffer layers. HRTEM micrographs and diffraction patterns confirm the tetragonal single crystal growth of the Fe70Pd30 films of ~1.2 micrometer thickness. The authors thank the DFG for funding via the SPP 1239.