Dumbbell‐shaped or Janus‐type nanocomposites have been attracting much attention recently due to their possible application in biomedicine and catalysis. Elsukova et al. (pp. 2437‐2442) have prepared dumbbell Ag‐Fe nanoparticles by magnetron sputtering with subsequent in‐flight annealing and investigated the effect of ageing on the particle structure and morphology. Structural properties and chemical compositions of freshly prepared and five‐month aged particles were examined by means of transmission electron microscopy including high‐resolution imaging, energy dispersive X‐ray spectroscopy, and 3D electron tomography. The fresh particles consist of a faceted Ag part on an Fe‐Fe3O4 composite particle of more spherical shape. The aged nanocomposite consists of a silver spherical particle that is attached to a hollow iron oxide sphere containing one or several Ag clusters inside.