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Effects of clustering and dimensionality on the magnetic properties of diluted magnetic semiconductors

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Abstract

The magnetic properties of films of diluted magnetic semiconductors (DMS) such as (Ga,Mn)As, as well as bulk grown crystals of similar materials, have been found to be extremely sensitive to growth conditions, both in terms of the ferromagnetic transition temperature, and the details of their magnetization curves. We study an impurity band model for carriers in Mn-doped DMS applicable in the low carrier density regime, and discuss the effects of clustering on the magnetic properties of DMS, using both numerical mean field and Monte Carlo simulations. In addition, we study the effects of dimensionality on the transition temperature and other magnetic behaviour, and compare our results with experimental data.

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Acknowledgments

We acknowledge useful discussions with Stefano Sanvito, Chenggang Zhou and Xin Wan. This work was supported by NSF DMR-9809483, NSF DMR-0213706, and the NSERC.

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Authors and Affiliations

  1. Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

    R.N. Bhatt

  2. Cavendish Laboratories, University of Cambridge, Madingley Rd, Cambridge, CB3 0HE, UK

    Malcolm. P. Kennett

  3. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada

    Mona Berciu & Adel Kassaian

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  1. R.N. Bhatt
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Bhatt, R., Kennett, M.P., Berciu, M. et al. Effects of clustering and dimensionality on the magnetic properties of diluted magnetic semiconductors. MRS Online Proceedings Library 794, 241–252 (2003). https://doi.org/10.1557/PROC-794-T8.8

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