Abstract
The ferromagnetic mediation centers of enough high concentration are the prerequisites for the realization of ferromagnetic diluted magnetic semiconductors. Zn0.97Co0.03S ultrafine nanoparticles of diameter ˜4 nm with zinc blende structure were synthesized by the chemical coprecipitation method. After annealing in H2 atmosphere at 500 °C for 2 h, Zn0.97Co0.03S 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 H2 has been excluded. Combining the structural characterizations and density functional theory calculations, we conclude that the interstitial H+ ions in wurtzite ZnS may provide efficient ferromagnetic mediation between the neighboring Co2+ ions.
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Acknowledgments
This work is supported by the National Key Projects for Basic Researches of China (2010CB923404 and 2014CB921101), National natural Science Foundation of China (51172044, 51331004, 11074112, and 11174131), the Natural Science Foundation of Jiangsu Province (BK2011617, BK2012322), and the 333 project of Jiangsu Province. This research was jointly sponsored by Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, People’s Republic of China (Project No: 131007-K ).
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Zhang, H., Chen, Q., Zhang, H. et al. Interstitial H+-Mediated Ferromagnetism in Co-Doped ZnS. J Supercond Nov Magn 28, 1389–1393 (2015). https://doi.org/10.1007/s10948-014-2860-1
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DOI: https://doi.org/10.1007/s10948-014-2860-1