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Structure and magnetism of MnAs nanocrystals embedded in GaAs as a function of post-growth annealing temperature

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9 Author(s)
Kwiatkowski, A. ; Institute of Experimental Physics, Warsaw University, Hoz˙a 69, 00-681 Warsaw, Poland ; Wasik, D. ; Kaminska, M. ; Boz ek, R.
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Self-organized Ga(Mn)As nanoclusters, embedded in GaAs, were formed during post-growth thermal annealing of Ga1-xMnxAs layers. Structural and magnetic properties of such composites were systematically studied as a function of the annealing temperature. Small (∼3 nm) Mn-rich zinc-blende Mn(Ga)As clusters, coherent with the GaAs matrix, were formed at the annealing temperature of 500 °C. An increase of the annealing temperature of up to 600 °C led to the creation of 10–20 nm large NiAs-type hexagonal MnAs nanocrystals. Magnetization measurements showed that the MnAs nanoprecipitates were superparamagnetic, with a distribution of blocking temperatures that depended on the MnAs cluster size. Some intermediate paramagnetic clusters (structurally disordered clusters) were also observed.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 11 )

Date of Publication:

Jun 2007

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