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The source of room temperature ferromagnetism in granular GaMnAs layers with zinc blende clusters

Lawniczak-Jablonska, K.; Libera, J.; Wolska, A.; Klepka, M. T.; Dluzewski, P.; Sadowski, Janusz LU ; Wasik, D.; Twardowski, A.; Kwiatkowski, A. and Sato, K. (2011) In Physica Status Solidi. Rapid Research Letters 5(2). p.62-64
Abstract
Granular GaAs:(Mn,Ga) As films were prepared by annealing the Ga0.985Mn0.015As/GaAs layers at 500 degrees C or 600 degrees C. It is commonly accepted that this processing should result in the formation of cubic or hexagonal MnAs clusters, respectively. We demonstrate that such a priori assumption is not justified. If in the as grown sample there are not many defects with the interstitial Mn atoms, only small cubic clusters can be formed even after annealing at 600 degrees C. Moreover, in a sample containing solely cubic GaMnAs clusters, the Mn ions are ferro-magnetically coupled at room temperature. This fact was explained by the existence of GaMnAs solid solution in the clusters, with content of Mn close to 20% (higher than ever found in... (More)
Granular GaAs:(Mn,Ga) As films were prepared by annealing the Ga0.985Mn0.015As/GaAs layers at 500 degrees C or 600 degrees C. It is commonly accepted that this processing should result in the formation of cubic or hexagonal MnAs clusters, respectively. We demonstrate that such a priori assumption is not justified. If in the as grown sample there are not many defects with the interstitial Mn atoms, only small cubic clusters can be formed even after annealing at 600 degrees C. Moreover, in a sample containing solely cubic GaMnAs clusters, the Mn ions are ferro-magnetically coupled at room temperature. This fact was explained by the existence of GaMnAs solid solution in the clusters, with content of Mn close to 20% (higher than ever found in the layers) as was confirmed by experiment and theory. Extended X-ray absorption spectroscopy studies excluded the possibility of formation of the hypothetic zinc blende MnAs clusters. Not more than one Mn atom was detected in the second shell around central Mn atom. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
GaMnAs, semiconductors, granular material, spintronics, room, temperature ferromagnetism
in
Physica Status Solidi. Rapid Research Letters
volume
5
issue
2
pages
62 - 64
publisher
John Wiley & Sons
external identifiers
  • wos:000288178300006
  • scopus:79251559701
ISSN
1862-6254
DOI
10.1002/pssr.201004503
language
English
LU publication?
yes
id
ce47d3db-a09d-43b1-818f-18d3cb72db5e (old id 1868264)
date added to LUP
2011-04-19 15:54:32
date last changed
2017-01-01 03:44:37
@article{ce47d3db-a09d-43b1-818f-18d3cb72db5e,
  abstract     = {Granular GaAs:(Mn,Ga) As films were prepared by annealing the Ga0.985Mn0.015As/GaAs layers at 500 degrees C or 600 degrees C. It is commonly accepted that this processing should result in the formation of cubic or hexagonal MnAs clusters, respectively. We demonstrate that such a priori assumption is not justified. If in the as grown sample there are not many defects with the interstitial Mn atoms, only small cubic clusters can be formed even after annealing at 600 degrees C. Moreover, in a sample containing solely cubic GaMnAs clusters, the Mn ions are ferro-magnetically coupled at room temperature. This fact was explained by the existence of GaMnAs solid solution in the clusters, with content of Mn close to 20% (higher than ever found in the layers) as was confirmed by experiment and theory. Extended X-ray absorption spectroscopy studies excluded the possibility of formation of the hypothetic zinc blende MnAs clusters. Not more than one Mn atom was detected in the second shell around central Mn atom. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim},
  author       = {Lawniczak-Jablonska, K. and Libera, J. and Wolska, A. and Klepka, M. T. and Dluzewski, P. and Sadowski, Janusz and Wasik, D. and Twardowski, A. and Kwiatkowski, A. and Sato, K.},
  issn         = {1862-6254},
  keyword      = {GaMnAs,semiconductors,granular material,spintronics,room,temperature ferromagnetism},
  language     = {eng},
  number       = {2},
  pages        = {62--64},
  publisher    = {John Wiley & Sons},
  series       = {Physica Status Solidi. Rapid Research Letters},
  title        = {The source of room temperature ferromagnetism in granular GaMnAs layers with zinc blende clusters},
  url          = {http://dx.doi.org/10.1002/pssr.201004503},
  volume       = {5},
  year         = {2011},
}