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Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate

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Abstract

This article demonstrates the removal of organic capping and promotion of long-range 2D organization of chemically synthesized FePt nanoparticles dispersed on Si 〈100 〉 substrate by means of pulsed H+ energetic ion irradiation using a dense plasma focus (DPF) device. The irradiation of energetic H+ ions on FePt nanoparticles clearly resulted in enhanced structural and magnetic behaviour of the FePt nanoparticles as a function of plasma focused irradiation shots. Transmission electron microscopy (TEM)/scanning electron microscopy (SEM) images of the FePt nanoparticles clearly show a marked enhancement in average particle size from 2.5 nm for non-irradiated sample to about 28 nm for four plasma focus shots irradiation. The gradual removal of organic capping over chemically synthesized FePt nanoparticles with increasing plasma focus shots exposure is confirmed using Raman spectroscopy. A uniform 2D organization of bimetallic FePt nanoparticles over 1 cm × 1 cm silicon substrate is obtained with three plasma focus shots with better magnetic properties as compared with plasma-untreated FePt nanoparticles.

Plasma focused irradiation shots

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Acknowledgement

This research was supported by NIE/NTU AcRF grant (RI 7/11 RSR) provided by the National Institute of Education, Nanyang Technological University, Singapore.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Kyushu Institute of Technology, Iizuka, Fukuoka, 8208502, Japan

    ROHIT MEDWAL

  2. Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

    NEERU SEHDEV & S ANNAPOORNI

  3. Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore, 637616, Singapore

    ROHIT MEDWAL, WANG YING & R S RAWAT

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  1. ROHIT MEDWAL
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  2. NEERU SEHDEV
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  3. WANG YING
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  4. R S RAWAT
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Correspondence to ROHIT MEDWAL.

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MEDWAL, R., SEHDEV, N., YING, W. et al. Dense-plasma-driven ultrafast formation of FePt organization on silicon substrate. Bull Mater Sci 40, 233–238 (2017). https://doi.org/10.1007/s12034-017-1359-3

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  • DOI: https://doi.org/10.1007/s12034-017-1359-3

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