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Published online by Cambridge University Press: 25 February 2011
Scanning reflection electron microscopy was used to examine step structures which form on vicinal Si(111) specimens during resistive electrical heating under ultrahigh vacuum. Heating-current-induced step bunching occurred, forming substantially linear step-bands in specific temperature regions. Small pinning points disrupted the linearity of steps. The interaction between step-bands and large pinning points resulted in the formation of macrosteps, which showed some stability against dispersal during current reversal. Ion-etched grooves influenced step orientation during current-induced step migration.