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

Kwiatkowski, A. ; Wasik, D. ; Kaminska, M. ; Bozek, R. ; Szczytko, J. ; Twardowski, A. ; Borysiuk, J. ; Sadowski, Janusz LU and Gosk, J. (2007) In Applied Physics Reviews 101(11).
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Reviews
volume
101
issue
11
article number
113912
publisher
American Institute of Physics (AIP)
external identifiers
  • wos:000247306000097
  • scopus:34250661900
ISSN
1931-9401
DOI
10.1063/1.2739215
language
English
LU publication?
yes
id
46b4aa37-b43a-4be8-a8e8-480a07dd2b70 (old id 648412)
date added to LUP
2016-04-01 12:04:24
date last changed
2022-01-26 22:24:04
@article{46b4aa37-b43a-4be8-a8e8-480a07dd2b70,
  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.}},
  author       = {{Kwiatkowski, A. and Wasik, D. and Kaminska, M. and Bozek, R. and Szczytko, J. and Twardowski, A. and Borysiuk, J. and Sadowski, Janusz and Gosk, J.}},
  issn         = {{1931-9401}},
  language     = {{eng}},
  number       = {{11}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Applied Physics Reviews}},
  title        = {{Structure and magnetism of MnAs nanocrystals embedded in GaAs as a function of post-growth annealing temperature}},
  url          = {{http://dx.doi.org/10.1063/1.2739215}},
  doi          = {{10.1063/1.2739215}},
  volume       = {{101}},
  year         = {{2007}},
}