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Mechanisms of ion beam shaping of metal nanoparticals
Heinig, K.-H.;
The functionality of nanoparticles can be extended further by shape anisotropy. Thus, for future hard disks, rod-like nanomagnets are more resistant against thermally activated spin flipping than spheres, and, for photonics, light is guided as surface plasmon-polariton along a chain of rods with less damping than along a chain of spheres.
Recently it has been shown [1] that Au nanospheres embedded in SiO2 can be shaped into rods (and even wires) by swift heavy ion irradiation. The underlying mechanisms are largely unknown. Van Dillen has proven [2] that the Trinkaus model [3], which describes successfully the ion beam shaping of dielectrics/semiconductors, can not be applied to ion beam shaping of metal nanoparticles.
Here, a consistent mechanism of ion beam shaping and nanowire ripening will be presented. Using the temperature-time profiles of ion tracks in SiO2 as delivered by Toulemonde [4], atomistic computer experiments performed with kinetic Monte-Carlo and Molecular Dynamics codes reproduce the experimental results [5]. Our comprehensive numerical studies facilitate a further optimisation of ion beam shaping.
[1] A. Vredenberg et al., Int. Conf. “Ion Beam Modification of Materials”, Monterey (USA), Sept. 5-10, 2004.
[2] T. van Dillen, Int. Workshop on “Ion Beam Shaping”, Amsterdam (Netherlands), Dec. 17, 2004.
[3] H. Trinkaus, J. Nucl. Mater. 223, 196 (1995).
[4] M. Toulemonde, Nucl. Instr. and Methods B66/67, 903 (2000), and private comm..
[5] K.-H. Heinig, Int. Workshop on “Ion Beam Shaping”, Amsterdam (Netherlands), Dec. 17, 2004.
Keywords: atomistic computer simulation, nanocluster, ion irradiation, shaping
  • Lecture (Conference)
    Materials Research Society 2005 FALL Meeting, Symp. OO: Growth, Modification, and Analysis by Ion Beams at the Nanoscale, 28.11.-01.12.2005, Boston, USA

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Publ.-Id: 8238