ABSTRACT Recent advances in additive nanofabrication have enabled the realization of free‐standing three‐dimensional architectures with precisely controlled geometry and material composition at the nanoscale. Here, we investigate the magnetic properties of 3D PtC/ core–shell heterostructures with engineered curvature and shell thickness profiles. Using focused electron‐beam‐induced deposition in combination with temperature‐induced site‐selective chemical vapor deposition, we realize hollow magnetic nanoshells with different cross‐section, curvature and thickness profiles with outer dimensions down to 200 nm. Using X‐ray magnetic circular dichroism photoelectron emission microscopy (XMCD‐PEEM) and full‐scale micromagnetic simulations, we reveal distinct curvature‐ and thickness‐dependent magnetization reversal mechanisms with the formation of axially symmetric Néel domain walls (DWs) separating vortex domains with opposite circulations. We quantify the role of uncompensated magnetostatic charges in curved hollow geometries and show how curvature and thickness asymmetry shape the micromagnetic energy landscape, DW pinning and the corresponding stray‐field distributions.
Volkov et al. (Wed,) studied this question.