Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix: from spherical to prolate shape
<p>Abstract</p> <p>Present work reports the elongation of spherical Ni nanoparticles (NPs) parallel to each other, due to bombardment with 120 MeV Au<sup>+9 </sup>ions at a fluence of 5 × 10<sup>13 </sup>ions/cm<sup>2</sup>. The Ni NPs e...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2011-01-01
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| Series: | Nanoscale Research Letters |
| Online Access: | http://www.nanoscalereslett.com/content/6/1/155 |
| Summary: | <p>Abstract</p> <p>Present work reports the elongation of spherical Ni nanoparticles (NPs) parallel to each other, due to bombardment with 120 MeV Au<sup>+9 </sup>ions at a fluence of 5 × 10<sup>13 </sup>ions/cm<sup>2</sup>. 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<sup>+9 </sup>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 (<it>H</it><sub>c</sub>) and remanence ratio (<it>M</it><sub>r</sub>/<it>M</it><sub>s</sub>) are stronger in the ion beam direction due to the preferential easy axis of elongated particles in the beam direction.</p> |
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| ISSN: | 1931-7573 1556-276X |