Spontaneous pattern formation induced by ion bombardment of binary compounds
RM Bradley, PD Shipman - Physical Review Letters, 2010 - APS
Physical Review Letters, 2010•APS
A theory is developed that explains the genesis of the strikingly regular hexagonal arrays of
nanoscale mounds that can form when a flat surface of a binary compound is subjected to
normal-incidence ion bombardment. We find that the species with the higher sputter yield is
concentrated at the peaks of the nanodots and that hysteretic switching between the flat and
the hexagonally ordered state can occur as the sample temperature is varied. Surface
ripples are predicted to emerge for a certain range of the parameters.
nanoscale mounds that can form when a flat surface of a binary compound is subjected to
normal-incidence ion bombardment. We find that the species with the higher sputter yield is
concentrated at the peaks of the nanodots and that hysteretic switching between the flat and
the hexagonally ordered state can occur as the sample temperature is varied. Surface
ripples are predicted to emerge for a certain range of the parameters.
A theory is developed that explains the genesis of the strikingly regular hexagonal arrays of nanoscale mounds that can form when a flat surface of a binary compound is subjected to normal-incidence ion bombardment. We find that the species with the higher sputter yield is concentrated at the peaks of the nanodots and that hysteretic switching between the flat and the hexagonally ordered state can occur as the sample temperature is varied. Surface ripples are predicted to emerge for a certain range of the parameters.
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