2009/11/05 by Marko Karlusic, Marko Karlu, Sevilay Akcoeltekin +13
Engineering · Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #Integrated Circuits and Semiconductor Failure Analysis #Ion-surface interactions and analysis #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.0911.1045
12 pages, 5 figures
arxiv created 2009/11/05 · arxiv updated 2009/12/01
We present theoretical and experimental data on the threshold behaviour of nanodot creation with swift heavy ions. A model calculation based on a two-temperature model taking the spatially resolved electron density into account gives a threshold of 12 keV/nm below which the energy density at the end of the track is no longer high enough to melt the material. In the corresponding experiments we irradiated SrTiO3 surfaces under grazing incidence with swift heavy ions. The resulting chains of nanodots were analyzed by atomic force microscopy. In addition, samples irradiated under normal incidence were analyzed by transmission electron microscopy. Both experiments show two thresholds, connected to the appearance of tracks and to the creation of fully developed tracks, respectively. The threshold values are similar for surface and bulk tracks, suggesting that the same processes occur at glancing and normal incidence. The experimental threshold for the formation of fully developed tracks compares well to the value obtained by the theoretical description.