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Using low energy electron microscopy we observe that Pd deposited on Ru onlyattaches to small sections of the atomic step edges surrounding Pd islands.This causes a novel epitaxial growth mode in which islands advance in asnakelike motion, giving rise to labyrinthine patterns. Based on densityfunctional theory together with scanning tunneling microscopy and low energyelectron microscopy we propose that this growth mode is caused by a surfacealloy forming around growing islands. This alloy gradually reduces stepattachment rates, resulting in an instability that favors adatom attachment atfast advancing step sections.

Labyrinthine Island Growth during Pd/Ru(0001) Heteroepitaxy