Influence of kinetics on the phase formation in epitaxial Fe–Pd films

Highly strained epitaxial growth is possible when using materials with an inherent structural instability. Here, we investigate the critical thickness and the relaxation mechanism of Fe70Pd30 magnetic shape memory alloy films by diffraction methods and transmission electron microscopy. By comparing...

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Bibliographic Details
Published in:Scripta materialia 2013-03, Vol.68 (6), p.412-415
Main Authors: Kauffmann-Weiss, Sandra, Erkartal, Burak, Schultz, Ludwig, Kienle, Lorenz, Fähler, Sebastian
Format: Article
Language:English
Subjects:
Critical film thickness
Magnetic shape memory alloy
Martensitic transformation
Relaxation
Transmission electron microscopy
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Summary:Highly strained epitaxial growth is possible when using materials with an inherent structural instability. Here, we investigate the critical thickness and the relaxation mechanism of Fe70Pd30 magnetic shape memory alloy films by diffraction methods and transmission electron microscopy. By comparing films deposited with different rates we identify accumulation of defects as the only relaxation path accessible at room temperature. Our analysis of strained growth reveals the importance of relaxation kinetics in addition to the common thermodynamic arguments.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2012.11.008