Morphology changes due to AC induced electromigration in Gd islands on W(1 1 0)

H. Realpe, N. Shamir, M. H. Mintz, Y. Manassen

Research output: Contribution to journalArticlepeer-review


Gd islands were grown on W(1 1 0) surface by evaporating Gd on the substrate at room temperature and subsequent annealing. STM images reveal in many cases islands which have a deep hole inside them. The appearance of the hole is associated with the application of an AC field. No such holes appear when the sample is heated by a DC current. We show that this can be explained by the combined affect of the AC field and the barrier to diffusion introduced by steps that can create a nucleus for further growth of an island which includes a hole in the middle. This may be generalized to a technique of tailoring the size, shape and distances of islands by, for example, two orthogonal AC fields with a phase delay of 90° between them.

Original languageEnglish
Pages (from-to)1177-1183
Number of pages7
JournalSurface Science
Issue number5
StatePublished - 1 Mar 2007


  • Gadolinium
  • Scanning tunneling microscopy
  • Surface morphology
  • Surface thermodynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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