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Electronic Structure and Ferromagnetism in Zincblende Zn1−xCoxS Nanoparticles

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Abstract

We have prepared Zn1−xCoxS nanoparticles (NPs) and studied their local-geometric, electronic, and magnetic properties. X-ray diffraction analyses have indicated that NPs with average crystallite sizes of 2.2 ∼ 2.9 nm are single phase and crystallize in the zincblende-type structure. Cobalt ions with oxidation state + 2 (Co2+) replaced for Zn2+ and almost unchanged the zincblende-type structure of the ZnS host lattice. Interestingly, all samples show room-temperature ferromagnetism and ferromagnetic order increases with increasing Co content (x) in Zn1−xCoxS NPs. With the results obtained from analyzing the local-geometric structures at Zn and Co K-edges and photoluminescence spectra, we believe that ferromagnetism in Zn1−xCoxS NPs is related to intrinsic defects and exchange interactions between Co2+ ions. We have also reviewed the recent studies on ZnS-based dilute-magnetic materials.

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Funding

This work is supported by Thai Nguyen University of Technology (Grant No. T2018-B01).

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Authors and Affiliations

  1. Faculty of Fundamental Sciences, Thai Nguyen University of Technology, Thai Nguyen, Vietnam

    M. T. Pham

  2. Faculty of Physics and Technology, Thai Nguyen University of Science, Thai Nguyen, Vietnam

    N. X. Ca & P. N. Loan

  3. Department of Physics, Hankuk University of Foreign Studies, Yongin, 17035, South Korea

    N. Tran & T. L. Phan

  4. Department of Chemistry, Changwon National University, Changwon, 51140, South Korea

    B. T. Huy

  5. Institute of Research and Development, Duy Tan University, Da Nang, Vietnam

    N. T. Dang

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Pham, M.T., Ca, N.X., Loan, P.N. et al. Electronic Structure and Ferromagnetism in Zincblende Zn1−xCoxS Nanoparticles. J Supercond Nov Magn 32, 1761–1768 (2019). https://doi.org/10.1007/s10948-018-4874-6

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