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Effect of Zn Addition on the Reduction of the Ordering Temperature of FePt Nanoparticles

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Abstract

Monodisperse FePt nanoparticles with an average size of 4.11 nm were successfully synthesized via chemical co-reduction of iron acetylacetonate, Fe(acac)3, and platinum acetylacetonate, Pt(acac)2, by 1,2hexadecanediol as a reducing agent. Also (FePt)87Zn13 nanoparticles with average size of 4.24 nm were synthesized using the same method. The structural and magnetic properties of the prepared samples were respectively studied by XRD, TEM and VSM. L10 FePt ordered phase is formed at lower annealing temperature by addition of Zn. The (FePt)87Zn13 nanoparticles starts ordering after annealing at 400 °C, whereas FePt nanoparticles at 400 °C are still disordered alloys with superparamagnetic behavior. Additive Zn is very effective in decreasing the ordering temperature and enhancing the chemical ordering in (FePt)87Zn13 particles, So that coercivity 5200 Oe was measured for (FePt)87Zn13 nanoparticles annealed at 500 °C, compared with 1800 Oe for samples without Zn. This reduction in ordering temperature significantly reduces FePt particle coalescence and loss in positional order.

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Acknowledgements

This work was supported by the Islamic Azad University Kashan Branch.

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Authors and Affiliations

  1. Department of Physics, Kashan Branch, Islamic Azad University, Kashan, Iran

    Hossein Zeynali & Reihaneh Karimi Ghasabeh

  2. Department of Physics, Ardabil Branch, Islamic Azad University, Ardabil, Iran

    Hossein Akbari

  3. Department of Physics, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran

    Yashar Azizian-Kalandaragh

  4. Center for Nanoscience and Technology, IST, Jawaharlal Nehru Technological University Hyderabad, Hyderabad, 500 085, Andhra Pradesh, India

    Seyed Mostafa Hosseinpour-Mashkani

  5. Department of Materials Science and Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

    Javad Baradaran

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  1. Hossein Zeynali
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Correspondence to Hossein Zeynali.

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Zeynali, H., Akbari, H., Ghasabeh, R.K. et al. Effect of Zn Addition on the Reduction of the Ordering Temperature of FePt Nanoparticles. J Supercond Nov Magn 26, 713–717 (2013). https://doi.org/10.1007/s10948-012-1792-x

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  • DOI: https://doi.org/10.1007/s10948-012-1792-x

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