Interstitial H super(+)-Mediated Ferromagnetism in Co-Doped ZnS

The ferromagnetic mediation centers of enough high concentration are the prerequisites for the realization of ferromagnetic diluted magnetic semiconductors. Zn sub(0.97)Co sub(0.03)S ultrafine nanoparticles of diameter ~4 nm with zinc blende structure were synthesized by the chemical coprecipitation...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2015-04, Vol.28 (4), p.1389-1393
Main Authors: Zhang, Huiyun, Chen, Qian, Zhang, Hua, Rui, Wenbin, Ding, Qian, Cao, Yanqiang, Zhong, Wei, Shen, Kai, Du, Jun, Xiang, Dinghan, Xu, Qingyu
Format: Article
Language:English
Subjects:
Coprecipitation
Ferromagnetism
Interstitials
Mediation
Temperature
Wurtzite
Zinc
Zinc sulfides
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Summary:The ferromagnetic mediation centers of enough high concentration are the prerequisites for the realization of ferromagnetic diluted magnetic semiconductors. Zn sub(0.97)Co sub(0.03)S ultrafine nanoparticles of diameter ~4 nm with zinc blende structure were synthesized by the chemical coprecipitation method. After annealing in H sub(2) atmosphere at 500 degree C for 2 h, Zn sub(0.97)Co sub(0.03)S transformed to wurtzite structure of increased particle size and strongly enhanced room temperature ferromagnetism has been observed. The possible ferromagnetic contribution from metallic Co due to reduction by H sub(2) has been excluded. Combining the structural characterizations and density functional theory calculations, we conclude that the interstitial H super(+) ions in wurtzite ZnS may provide efficient ferromagnetic mediation between the neighboring Co super(2+) ions.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-014-2860-1