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      https://www.ias.ac.in/article/fulltext/boms/040/01/0233-0238

    • Keywords

       

      Nanostructures; chemical synthesis; magnetic materials; phase transition.

    • Abstract

       

      This article demonstrates the removal of organic capping and promotion of long-range 2D organization of chemically synthesized FePt nanoparticles dispersed on Si$\langle 100\rangle$ 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 ofplasma 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 nonirradiated sample to about 28nm 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 usingRaman spectroscopy. A uniform 2D organization of bimetallic FePt nanoparticles over 1 cm $\times$ 1 cm silicon substrate is obtained with three plasma focus shots with better magnetic properties as compared with plasma-untreated FePtnanoparticles.

    • Author Affiliations

       

      ROHIT MEDWAL1 2 NEERU SEHDEV3 WANG YING2 R S RAWAT2 S ANNAPOORNI3

      1. Kyushu Institute of Technology, Iizuka, Fukuoka 8208502, Japan
      2. Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore
      3. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
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    • Supplementary Material

       
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