The effect of core–shell engineering on the energy product of magnetic nanometals

Solution-based growth of magnetic FePt–FeCo (core–shell) nanoparticles with a controllable shell thickness has been demonstrated. The transition from spin canting to exchange coupling of FePt–FeCo core–shell nanostructures leads to a 28% increase in the coercivity (12.8 KOe) and a two-fold enhancement in the energy product (9.11 MGOe).