Ion beam shaping and downsizing of nanostructures
  We report a new approach for progressive and well-controlled downsizing of nanostructures below the 10 nm scale. Low energetic ion beam (Ar+) is used for gentle surface erosion, progressively shrinking the dimensions with ~ 1 nm accuracy. The method enables shaping of nanostructure geometry and polishing the surface. The process is clean room / high vacuum compatible being suitable for various applications. Apart from technological advantages, the method enables study of various size phenomena on the same sample between sessions of ion beam treatment. 
M. Zgirski, K. P. Riikonen, V. Tuboltsev, P. Jalkanen, T. T. Hongisto   and K. Yu Arutyunov