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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 × 10 13  ions/cm 2 . 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.

Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix: from spherical to prolate shape