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

A. Kwiatkowski, D. Wasik, M. Kaminska, R. Bozek, J. Szczytko, A. Twardowski, J. Borysiuk, Janusz Sadowski, J. Gosk

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Abstract

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 (similar to 3 nm) Mn-rich zinc-blende Mn(Ga)As clusters, coherent with the GaAs matrix, were formed at the annealing temperature of 500 degrees C. An increase of the annealing temperature of up to 600 degrees 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. (c) 2007 American Institute of Physics.
Original languageEnglish
Article number113912
JournalApplied Physics Reviews
Volume101
Issue number11
DOIs
Publication statusPublished - 2007

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences

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