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Growth and characterisation of MnSb (0001) / InGaAs (111) A epitaxial films

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Mousley, Philip, Burrows, Christopher W., Ashwin, M. J., Sánchez, Ana M., Lazarov, V. K. and Bell, Gavin R. (2018) Growth and characterisation of MnSb (0001) / InGaAs (111) A epitaxial films. Journal of Crystal Growth, 498 . pp. 391-398. doi:10.1016/j.jcrysgro.2018.07.006

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Official URL: http://dx.doi.org/10.1016/j.jcrysgro.2018.07.006

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Abstract

MnSb layers have been grown on In x Ga 1 − x As(111)A virtual substrates using molecular beam epitaxy (MBE). The effects of both substrate temperature ( T sub ) and Sb/Mn beam flux ratio ( J Sb/Mn ) were investigated. The sur- face morphology, layer and interface structural quality, and magnetic prop- erties have been studied for a 3 × 3 grid of T sub and J Sb/Mn values. Com- pared to known optimal MBE conditions for MnSb/GaAs(111) [ T sub =415 ◦ C, J Sb/Mn =6.5], a lower substrate temperature is required for sharp interface for- mation when growing MnSb on In 0 . 48 Ga 0 . 52 As(111)A [ T sub =350 ◦ C, J Sb/Mn =6.5]. At high flux ratio ( J Sb/Mn =9.5) elemental Sb is readily incorporated into MnSb films. At higher substrate temperatures and lower flux ratios, (In,Ga)Sb inclusions in the MnSb are formed, as well as MnAs inclusions within the substrate. The Sb and (In,Ga)Sb inclusions are epitaxial, while MnAs in- clusions are endotaxial, i.e. all have a crytallographic relationship to the substrate and epilayer. MBE optimisation towards different device struc- tures is discussed along with results from a two-stage growth scheme.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Epitaxy, Crystal growth
Journal or Publication Title: Journal of Crystal Growth
Publisher: Elsevier BV, North-Holland
ISSN: 0022-0248
Official Date: 15 September 2018
Dates:
DateEvent
15 September 2018Published
10 July 2018Available
9 July 2018Accepted
Volume: 498
Page Range: pp. 391-398
DOI: 10.1016/j.jcrysgro.2018.07.006
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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