High-quality EuO thin films the easy way via topotactic transformation

Thomas Mairoser, Julia A. Mundy, Alexander Melville, Daniel Hodash, Paul Cueva, Rainer Held, Artur Glavic, Jürgen Schubert, David A. Muller, Darrell G. Schlom () and Andreas Schmehl
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Thomas Mairoser: Zentrum für Elektronische Korrelationen und Magnetismus, Universität Augsburg
Julia A. Mundy: School of Applied and Engineering Physics, Cornell University
Alexander Melville: Cornell University
Daniel Hodash: Cornell University
Paul Cueva: School of Applied and Engineering Physics, Cornell University
Rainer Held: Cornell University
Artur Glavic: Oak Ridge National Laboratory
Jürgen Schubert: Peter Grünberg Institute, PGI 9-IT, JARA-FIT, Research Centre Jülich
David A. Muller: School of Applied and Engineering Physics, Cornell University
Darrell G. Schlom: Cornell University
Andreas Schmehl: Zentrum für Elektronische Korrelationen und Magnetismus, Universität Augsburg

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Epitaxy is widely employed to create highly oriented crystalline films. A less appreciated, but nonetheless powerful means of creating such films is via topotactic transformation, in which a chemical reaction transforms a single crystal of one phase into a single crystal of a different phase, which inherits its orientation from the original crystal. Topotactic reactions may be applied to epitactic films to substitute, add or remove ions to yield epitactic films of different phases. Here we exploit a topotactic reduction reaction to provide a non-ultra-high vacuum (UHV) means of growing highly oriented single crystalline thin films of the easily over-oxidized half-metallic semiconductor europium monoxide (EuO) with a perfection rivalling that of the best films of the same material grown by molecular-beam epitaxy or UHV pulsed-laser deposition. As the technique only requires high-vacuum deposition equipment, it has the potential to drastically improve the accessibility of high-quality single crystalline films of EuO as well as other difficult-to-synthesize compounds.

Date: 2015
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DOI: 10.1038/ncomms8716

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