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Room temperature ferromagnetism in magic-sized Cr-doped CdS diluted magnetic semiconducting quantum dots

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Abstract

Manipulation of carrier spins in semiconductors for spintronics applications has received great attention driven by improved functionalities and higher speed operation. Doping of semiconductor nanocrystals by transition-metal ions pronounced as diluted magnetic semiconductors (DMS) has attracted tremendous attention. Such doping is, however, difficult to achieve in low-dimensional strongly quantum-confined nanostructures by conventional growth procedures. In the present case, magic-sized, pure, and Cr-doped CdS DM-QDs have been synthesized by solution phase chemistry (lyothermal method). Structural, optical, and magnetic investigation suggest an intrinsic nature of ferromagnetism with highly quantum-confined system. Optical and magnetic results of pure and doped QDs reveal major physical consequences of dopant localization within the capacity to engineer dopant-carrier exchange interactions introducing magnetic functionalities within the host semiconductor lattice. Unpaired Cr ions in Cd substitutional sites could create spin ordering and ferromagnetic coupling. The results presented herein illustrate some of the remarkable and unexpected complexities that can arise in doped QDs.

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Acknowledgments

Pushpendra Kumar is grateful for support from the University Grant Commission New Delhi for providing financial assistance under Dr. D. S. Kothari Postdoctoral Fellowship (DSK-PDF). KS is thankful to the Department of Science and Technology (DST), and UGC-New Delhi, Govt. of India, for providing BOYSCAST Fellowship to complete this study. We are also thankful to Prof. Naresh S. Dalal, Prof. Geoffrey F. Strouse, Dr. A.L. Washington, and Mr. Zhang Weiwei for their kind support and help during the whole course of study at Florida State University, Tallahassee, Florida, USA.

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  1. Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India

    Punita Srivastava, Pushpendra Kumar & Kedar Singh

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  1. Punita Srivastava
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  2. Pushpendra Kumar
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  3. Kedar Singh
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Correspondence to Kedar Singh.

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The Authors P. Srivastava and P. Kumar contributed equally to this work.

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Srivastava, P., Kumar, P. & Singh, K. Room temperature ferromagnetism in magic-sized Cr-doped CdS diluted magnetic semiconducting quantum dots. J Nanopart Res 13, 5077–5085 (2011). https://doi.org/10.1007/s11051-011-0488-7

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  • DOI: https://doi.org/10.1007/s11051-011-0488-7

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