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The potential experienced by transverse domain walls (TDWs) in the vicinityof asymmetric constrictions or protrusions in thin Permalloy nanowires isprobed using spatially resolved magneto-optical Kerr effect measurements. Bothtypes of traps are found to act as pinning centers for DWs. The strength ofpinning is found to depend on the trap type as well as on the chirality of theincoming DW; both types of traps are seen to act either as potential wells orpotential barriers, also depending on the chirality of the DW. Micromagneticsimulations have been performed that are in good qualitative agreement with theexperimental results.

Domain wall pinning and potential landscapes created by constrictions and protrusions in ferromagnetic nanowires