Dresden 2017 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 3: Thin Film Characterisation: Structure Analysis and Composition I
DS 3.11: Vortrag
Montag, 20. März 2017, 12:15–12:30, CHE 91
Insights into epitaxial growth of thin film samples of the ferromagnetic shape memory alloy Fe7Pd3 — •Alina J. Bischoff1, Kenneth Hua1, and Stefan G. Mayr1,2 — 1Leibniz-Institut für Oberflächenmodifizierung, Leipzig — 2Abteilung Oberflächenphysik, Fakultät für Physik und Geowissenschaften, Universität Leipzig
Single crystalline-like thin film Fe7Pd3 samples allow to study the physics of this promising ferromagnetic shape memory alloy. We demonstrate how to prepare such samples using electron beam evaporation and investigate the impact of variable deposition parameters such as growth temperature and deposition interruptions. We are able to epitaxially grow 500 nm thin Fe7Pd3 samples in austenitic and martensitic phases and the latter with visible surface twinning structures. Ideal growth conditions are given around 700 ∘C because deposition at temperatures below 690 ∘C results in demixing of samples while film quality is reduced at higher temperatures due to lattice misfit effects. Our investigations enabled us to identify a deposition procedure, which is realizable without much effort, to grow samples of increased and satisfyingly good quality so that subsequent processing of samples is rendered unnecessary.