FePt3/CoFe2O4 core/shell nanostructures and their magnetic properties

► Monodisperse 2 nm FePt3 (Fe34Pt66) nanoparticles were synthesized successfully by polyol process. ► Also FePt (Fe63Pt37) nanoparticles were synthesized by modifying mole ratio of initial precursor. ► By adding magnetic shell around FePt3 we could reduce the degree of agglomeration during annealing. ► Effects of shell thickness on the magnetic properties of FePt3 nanoparticles have been studied. ► After annealing, Fe34Pt66 nanoparticles reached to coercivity as 850 Oe.