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.
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