Abstract
A novel approach to fabricating a highly aligned one-dimensional (1D) surface nanostructure on the surface of Fe/ZnSe bilayers grown on GaAs (0 0 1) substrates is reported. The resulting 1D nano-grooves were found to align along the [1 1 0] direction with a spacing of about 7–10 nm and a height of about 1–2 nm, resulting in a circular arc reflection high-energy electron diffraction (RHEED) pattern when the e-beam is aligned with them. We present a model based on Ewald construction to explain the unusual RHEED observation. The formation mechanism of the 1D nano-grooves is possibly related to an Fe–Se exchange interaction and Fe-induced decomposition of several top ZnSe atomic layers with regional selection during high-temperature annealing.
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