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Open Access item Cracking of epitaxial MnAs films on GaAs(001)

Authors:Takagaki, Y.
Moreno, M.
Schützendübe, P.
Ramsteiner, M.
Hermann, C.
Issue Date:25-Jan-2010
Publisher:American Institute of Physics
Citation:Journal of Applied Physics Beta 107(2): 023510 (2010)
Abstract:We report the characteristics of the fracture of epitaxially grown MnAs films on GaAs (001)due to the large thickness or induced by annealing. Stresses arising from the thermal expansion mismatch and the structural phase transition can no longer be accommodated when the film thickness is beyond about 0.5 (nu)m, giving rise to cracking of the films. The cracks are inclined with respect to the c axis of MnAs, suggesting their initiation by a weak plane. For films thicker than about 2 (nu)m, the fracture extends to the substrates, where the in-plane crack angle changes from about 57° to around 45° as the cracking is dictated by the cleavage plane of the substrates. Even for films much thinner than 0.5 (nu)m, annealing results in a delamination from substrate as a consequence of the large thermal expansion and, plausibly, the oxidation of MnAs. We show that Mn capping suppresses the delamination as well as the oxidation during the annealing.
Description:6 pages, 7 figures.
Publisher version (URL):http://dx.doi.org/10.1063/1.3288993
URI:http://hdl.handle.net/10261/21005
ISSN:0021-8979
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Appears in Collections:(ICMM) Artículos

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