The source of room temperature ferromagnetism in granular GaMnAs layers with zinc blende clusters
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1868264
- author
- Lawniczak-Jablonska, K. ; Libera, J. ; Wolska, A. ; Klepka, M. T. ; Dluzewski, P. ; Sadowski, Janusz LU ; Wasik, D. ; Twardowski, A. ; Kwiatkowski, A. and Sato, K.
- organization
- publishing date
- 2011
- 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 Inc.
- 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
- 2016-04-01 10:36:43
- date last changed
- 2022-01-26 00:50:51
@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}},
keywords = {{GaMnAs; semiconductors; granular material; spintronics; room; temperature ferromagnetism}},
language = {{eng}},
number = {{2}},
pages = {{62--64}},
publisher = {{John Wiley & Sons Inc.}},
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}},
doi = {{10.1002/pssr.201004503}},
volume = {{5}},
year = {{2011}},
}