Bimetallic nanoparticles
(NPs) can be tailored by varying the concentration
of their constituent elements, resulting in novel structures and/or
configurations, leading to interesting electronic, mechanical, and
chemical properties. In this paper, by means of molecular dynamics
calculations, we study the morphology of bimetallic FeCu NPs as a
function of the Cu concentration. Our results evidence a core–shell
(CS) structure for low Cu concentrations and a Janus (JN)-like morphology
for high Cu content. Structural and energy characterizations were
performed to determine the atomic-scale behavior of the NPs. Using
a continuous model to describe immiscible components, we obtain a
stability transition curve between CS and JN-like structures for several
NP sizes and concentrations. Results from both methods are compared
with experimental data obtained for NPs with low and high Cu content,
evidencing a good agreement among the three approaches.