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Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature

Ferromagnetic Ge(1−x)Mn(x)Te is a promising candidate for diluted magnetic semiconductors because solid solutions exist over a wide range of compositions up to x(Mn)≈0.5, where a maximum in the total magnetization occurs. In this work, a systematic study of molecular beam epitaxy of GeMnTe on (1 1 1...

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Autores principales: Hassan, M., Springholz, G., Lechner, R.T., Groiss, H., Kirchschlager, R., Bauer, G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: North-Holland Pub. Co 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3114077/
https://www.ncbi.nlm.nih.gov/pubmed/21776175
http://dx.doi.org/10.1016/j.jcrysgro.2010.10.135
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author Hassan, M.
Springholz, G.
Lechner, R.T.
Groiss, H.
Kirchschlager, R.
Bauer, G.
author_facet Hassan, M.
Springholz, G.
Lechner, R.T.
Groiss, H.
Kirchschlager, R.
Bauer, G.
author_sort Hassan, M.
collection PubMed
description Ferromagnetic Ge(1−x)Mn(x)Te is a promising candidate for diluted magnetic semiconductors because solid solutions exist over a wide range of compositions up to x(Mn)≈0.5, where a maximum in the total magnetization occurs. In this work, a systematic study of molecular beam epitaxy of GeMnTe on (1 1 1) BaF(2) substrates is presented, in which the Mn concentration as well as growth conditions were varied over a wide range. The results demonstrate that single phase growth of GeMnTe can be achieved only in a narrow window of growth conditions, whereas at low as well as high temperatures secondary phases or even phase separation occurs. The formation of secondary phases strongly reduces the layer magnetization as well as the Curie temperatures. Under optimized conditions, single phase GeMnTe layers are obtained with Curie temperatures as high as 200 K for Mn concentrations close to the solubility limit of x(Mn)=50%.
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spelling pubmed-31140772011-07-18 Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature Hassan, M. Springholz, G. Lechner, R.T. Groiss, H. Kirchschlager, R. Bauer, G. J Cryst Growth Article Ferromagnetic Ge(1−x)Mn(x)Te is a promising candidate for diluted magnetic semiconductors because solid solutions exist over a wide range of compositions up to x(Mn)≈0.5, where a maximum in the total magnetization occurs. In this work, a systematic study of molecular beam epitaxy of GeMnTe on (1 1 1) BaF(2) substrates is presented, in which the Mn concentration as well as growth conditions were varied over a wide range. The results demonstrate that single phase growth of GeMnTe can be achieved only in a narrow window of growth conditions, whereas at low as well as high temperatures secondary phases or even phase separation occurs. The formation of secondary phases strongly reduces the layer magnetization as well as the Curie temperatures. Under optimized conditions, single phase GeMnTe layers are obtained with Curie temperatures as high as 200 K for Mn concentrations close to the solubility limit of x(Mn)=50%. North-Holland Pub. Co 2011-05-15 /pmc/articles/PMC3114077/ /pubmed/21776175 http://dx.doi.org/10.1016/j.jcrysgro.2010.10.135 Text en © 2011 Elsevier B.V. https://creativecommons.org/licenses/by-nc-nd/3.0/ Open Access under CC BY-NC-ND 3.0 (https://creativecommons.org/licenses/by-nc-nd/3.0/) license
spellingShingle Article
Hassan, M.
Springholz, G.
Lechner, R.T.
Groiss, H.
Kirchschlager, R.
Bauer, G.
Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title_full Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title_fullStr Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title_full_unstemmed Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title_short Molecular beam epitaxy of single phase GeMnTe with high ferromagnetic transition temperature
title_sort molecular beam epitaxy of single phase gemnte with high ferromagnetic transition temperature
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3114077/
https://www.ncbi.nlm.nih.gov/pubmed/21776175
http://dx.doi.org/10.1016/j.jcrysgro.2010.10.135
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