Most commonly magnetoplasmonic nanoparticles (MagPlas NPs) are unique composites combining magnetic and plasmonic materials within a confined nanoscale area that simultaneously show magnetic and plasmonic characteristics. They generally use Fe, Co, or Ni-based magnetic materials and noble-metal (e.g., Au, Ag, Cu, or Pt) plasmonic components, comprising a precious metal layer along a magnetic core or the inverse structure. MagPlas NPs are emerging multi-functional materials in the fields of nanoscale optoelectronics, anisotropic optics, electronics, optical sensing, and imaging. Their potential for sensing, targeting, and multimodal imaging is highly attractive for nanomedicine and nanobiotechnology. Because they possess suitable biocompatibility, MagPlas NPs have also been used in biosensor systems, hyperthermia, and magnetic resonance imaging (MRI) applications. This relatively new field of science employs MagPlas NPs in biological systems, which have great application potential in biomedicine and biomed...