Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)

We have investigated the relation between local structure, valence and carrier type with magnetism in the Zn-Co-O system. Thin films ranging from wurtzite Zn(1−x)Co(x)O (Co:ZnO) to ZnCo(2)O(4) spinel were grown on c-sapphire substrates. On the one hand, the unprecedented doping of x = 0.6 Co in ZnO...

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Autores principales: Henne, Bastian, Ney, Verena, Ollefs, Katharina, Wilhelm, Fabrice, Rogalev, Andrei, Ney, Andreas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4649617/
https://www.ncbi.nlm.nih.gov/pubmed/26578268
http://dx.doi.org/10.1038/srep16863
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author Henne, Bastian
Ney, Verena
Ollefs, Katharina
Wilhelm, Fabrice
Rogalev, Andrei
Ney, Andreas
author_facet Henne, Bastian
Ney, Verena
Ollefs, Katharina
Wilhelm, Fabrice
Rogalev, Andrei
Ney, Andreas
author_sort Henne, Bastian
collection PubMed
description We have investigated the relation between local structure, valence and carrier type with magnetism in the Zn-Co-O system. Thin films ranging from wurtzite Zn(1−x)Co(x)O (Co:ZnO) to ZnCo(2)O(4) spinel were grown on c-sapphire substrates. On the one hand, the unprecedented doping of x = 0.6 Co in ZnO enables to study the structural and magnetic properties well-above the coalescence limit. On the other hand, the ZnCo(2)O(4) spinel provides a p-type environment. We find a strong correlation between local structure, valence and carrier type throughout the Zn-Co-O system. In contrast to earlier publications neither 60% Co:ZnO nor ZnCo(2)O(4) exhibit any sign of ferromagnetic order despite of the high concentration of magnetic ions and a p-type carrier background. Instead, antiferromagnetic exchange is found to be the predominant magnetic interaction in the Zn-Co-O system.
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spelling pubmed-46496172015-11-23 Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4) Henne, Bastian Ney, Verena Ollefs, Katharina Wilhelm, Fabrice Rogalev, Andrei Ney, Andreas Sci Rep Article We have investigated the relation between local structure, valence and carrier type with magnetism in the Zn-Co-O system. Thin films ranging from wurtzite Zn(1−x)Co(x)O (Co:ZnO) to ZnCo(2)O(4) spinel were grown on c-sapphire substrates. On the one hand, the unprecedented doping of x = 0.6 Co in ZnO enables to study the structural and magnetic properties well-above the coalescence limit. On the other hand, the ZnCo(2)O(4) spinel provides a p-type environment. We find a strong correlation between local structure, valence and carrier type throughout the Zn-Co-O system. In contrast to earlier publications neither 60% Co:ZnO nor ZnCo(2)O(4) exhibit any sign of ferromagnetic order despite of the high concentration of magnetic ions and a p-type carrier background. Instead, antiferromagnetic exchange is found to be the predominant magnetic interaction in the Zn-Co-O system. Nature Publishing Group 2015-11-18 /pmc/articles/PMC4649617/ /pubmed/26578268 http://dx.doi.org/10.1038/srep16863 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Henne, Bastian
Ney, Verena
Ollefs, Katharina
Wilhelm, Fabrice
Rogalev, Andrei
Ney, Andreas
Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title_full Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title_fullStr Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title_full_unstemmed Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title_short Magnetic interactions in the Zn-Co-O system: tuning local structure, valence and carrier type from extremely Co doped ZnO to ZnCo(2)O(4)
title_sort magnetic interactions in the zn-co-o system: tuning local structure, valence and carrier type from extremely co doped zno to znco(2)o(4)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4649617/
https://www.ncbi.nlm.nih.gov/pubmed/26578268
http://dx.doi.org/10.1038/srep16863
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