(a) Equilibrium shape of an isolated CC Fe@Au NP with an Au/Fe volume ratio of 1.2 and a core volume of 475 nm³ from an analytical model [18]. (b) Two identical CC NPs connected by their pyramids, each NP displaying the equilibrium shape of an isolated Fe@Au NP with an Au/Fe volume ratio of 0.67 and a Fe volume 1400 nm³ from the analytical model. (c) A possible MC morphology using the same metallic volumes as in (b). Note that the density functional theory was used to compute the surface and interface energy in the analytical models of isolated CC NPs. The NP models are displayed in cross-sections.