Tuning the Size, Shape and Density of γ′-GayFe4−yN Nanocrystals Embedded in GaN

Navarro-Quezada, Andrea; Devillers, Thibaut; Li, Tian; Bonanni, Alberta

doi:10.3390/cryst9010050

Volume 9, Issue 1

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Crystals 2019, 9(1), 50; https://doi.org/10.3390/cryst9010050

Tuning the Size, Shape and Density of γ′-Ga_yFe_4−yN Nanocrystals Embedded in GaN

Andrea Navarro-Quezada^*

, Thibaut Devillers^†

, Tian Li

and Alberta Bonanni

Institute for Semiconductor and Solid-State Physics, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria

Author to whom correspondence should be addressed.

^†

Current address: Institute Néel, CNRS, 25 rue des Martyrs BP 166, 38042 Grenoble, France.

Received: 13 December 2018 / Revised: 11 January 2019 / Accepted: 13 January 2019 / Published: 17 January 2019

(This article belongs to the Special Issue MOVPE Growth of Crystalline Film)

Full-Text | PDF [1764 KB, uploaded 17 January 2019] |

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Abstract

Phase-separated semiconductor systems hosting magnetic nanocrystal (NCs) are attracting increasing attention, due to their potential as spintronic elements for the next generation of devices. Owing to their morphology- and stoichiometry-dependent magnetic response, self-assembled

γ

’-Ga

_{y}

_{4 - y}

N NCs embedded in a Fe

δ

-doped GaN matrix, are particularly versatile. It is studied and reported here, how the tuning of relevant growth parameters during the metalorganic vapour phase epitaxy process affects the crystalline arrangement, size, and shape of these self-assembled nanostructures. In particular, it is found that the Ga-flow provided during the

δ

-doping, determines the amount of Fe incorporated into the layers and the spatial density of the NCs. Moreover, the in-plane dimensions of the NCs can also be controlled via the Ga-flow, conditioning the aspect-ratio of the embedded nanostructures. These findings are pivotal for the design of nanocrystal arrays with on-demand size and shape, essential requirements for the implementation into functional devices. View Full-Text

Keywords: magnetic nanocrystals; Metal-organic vapor phase epitaxy; III-nitrides

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Navarro-Quezada, A.; Devillers, T.; Li, T.; Bonanni, A. Tuning the Size, Shape and Density of γ′-Ga_yFe_4−yN Nanocrystals Embedded in GaN. Crystals 2019, 9, 50.