Magnetic nanostructures are promising for nonvolatile data storage applications, as well as for reconfigurable logic devices. The derived magnetic logic concepts are commonly relying on the magnetostatic coupling of small ensembles or larger chains and networks of nanostructures. Recently, we presented a simple single-layer logic element based on an S-shaped geometry. This reconfigurable device can be integrated with magnetoresistive elements and is relatively simple to fabricate. We present a detailed micromagnetic analysis of the geometrical parameter space in which the logic element performs reliably. The influence of imperfections on the device characteristics, that is, sidewall roughness and roundedness of the edges, is investigated. Special attention is paid to obtain configurations with symmetric input field values. © 2012 IEEE.