Transmission electron microscopy on as–deposited and freestanding single crystalline Fe70Pd30 ferromagnetic shape memory alloy thin film. (15th July 2017)

• Record Type: Journal Article
• Authors: Landgraf, A.; Lotnyk, A.; Mayr, S.G.
• Is Part Of: Scripta materialia. Number 136(2017)
• Page Start: 97
• Page End: 100
• Publication Date: 2017-07-15
• Subjects: Shape memory effect -- Martensitic phase transition -- Twin variants; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.04.022
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Within this transmission electron microscopy study, we explore the atomic structure of Fe-Pd thin films with and without supporting single crystalline (001) MgO substrate. We observe a phase structural transition depending strongly on spatial limited stresses. While around the film-substrate interface edge dislocations form to minimize stresses due to the lattice misfit between MgO and Fe-Pd, preferring the face-centered cubic phase, upper sample regions show twinning structures with the face- and body-centered tetragonal phase, respectively. In freestanding films, bct and bcc phases are observed. Compared to unprocessed lift-off films, no hierarchical structure was existent anymore, based on changed stress distributions. Graphical Abstract: