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Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix: from spherical to prolate shape |
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| Authors: | Hardeep Kumar Santanu Ghosh Devesh Kumar Avasthi Debdulal Kabiraj Arndt Mücklich Shengqiang Zhou Heidemarie Schmidt Jean-Paul Stoquert |
| Affiliation: | 1.Nanostech Laboratory, Department of Physics,Indian Institute of Technology Delhi,New Delhi,India;2.Inter University Accelerator Centre,Aruna Asaf Ali Marg,New Delhi,India;3.Institute of Ion Beam Physics and Materials Research,Forschungszentrum Dresden-Rossendorf,Dresden,Germany;4.Institut d'Electronique du Solide et des Systèmes,Strasbourg Cedex 2,France |
| Abstract: | Present work reports the elongation of spherical Ni nanoparticles (NPs) parallel to each other, due to bombardment with 120 MeV Au+9 ions at a fluence of 5 × 1013 ions/cm2. The Ni NPs embedded in silica matrix have been prepared by atom beam sputtering technique and subsequent annealing. The elongation of Ni NPs due to interaction with Au+9 ions as investigated by cross-sectional transmission electron microscopy (TEM) shows a strong dependence on initial Ni particle size and is explained on the basis of thermal spike model. Irradiation induces a change from single crystalline nature of spherical particles to polycrystalline nature of elongated particles. Magnetization measurements indicate that changes in coercivity (H c) and remanence ratio (M r/M s) are stronger in the ion beam direction due to the preferential easy axis of elongated particles in the beam direction. |
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