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Achieving Isolated Fe100−x Pt x Nanoparticles with High Magnetic Coercivity

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Abstract

Monodisperse Fe100−x Pt x (x=37, 41, 47, 54, 61, 66, 74) nanoparticles with an average size of 4.5 nm were successfully synthesized using the chemical polyol process. As-synthesized Fe100−x Pt x nanoparticles have the chemically disordered face-centered cubic (fcc) structure with A1 phase. To achieve an ordered structure L10 phase for FePt and L12 phase for FePt3 particles, high-temperature annealing is required. In this work, with optimizing effective parameters of annealing and also by changing the stoichiometric of Fe100−x Pt x nanoparticles, we were able to achieve coercivity of 16,500 Oe for Fe53Pt47, which is heat treated at 650 ∘C for 60 min with 20 ∘C/min (annealing heating rate). It is obvious that the annealing procedure in this temperature leads to destruction of surfactant and sintering. In this work, chemically synthesized Fe53Pt47 nanoparticles were coated by a nonmagnetic CoO oxide shell to prevent them from sintering. Results show that the size of the core/shell (Fe53Pt47/CoO) nanoparticles after the annealing at a temperature of 650 ∘C has not changed compared to the size of the as-synthesized state. Meanwhile, the coercivity of about 5580 Oe is obtained for this nanocomposite.

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Acknowledgement

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

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Authors and Affiliations

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

    R. Shariatzadeh & H. Zeynali

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

    H. Akbari

  3. Center for High Pressure Research School of Physics, Bharathidasan University, Tiruchirapali, 620024, Tamil Nadu, India

    S. Arumugam & G. Kalaiselvan

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  1. R. Shariatzadeh
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  2. H. Akbari
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Correspondence to R. Shariatzadeh.

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Shariatzadeh, R., Akbari, H., Zeynali, H. et al. Achieving Isolated Fe100−x Pt x Nanoparticles with High Magnetic Coercivity. J Supercond Nov Magn 26, 3475–3485 (2013). https://doi.org/10.1007/s10948-013-2196-2

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