Polymer-mediated synthesis of Fe-Co nanocrystalline alloys: Formulation and properties

Abstract FeCo nanoalloy particles encapsulated in N-doped carbonized shell FeCo/C-N were synthesized by thermolysis at 400 °C of polyacrylamide complex FeCoPAAm following frontal polymerization of co-crystallizate of Fe and Co nitrates and acrylamide (AAm). During the annealing of FeCoPAAm in argon atmosphere, Co (II) and Fe(III) cations are reduced to form CoFe nanoalloy particles, while simultaneously PAAm forms nitrogen-doped carbon shell layer. Such unique architectures offer not only high chemical and thermal stability, but also a high magnetic properties. The average crystalline size of FeCo nanoparticles is 50 nm. The measurements of magnetic hysteresis loops showed that the coercive force and residual magnetization at room temperature are 119,5 Oe and 10 emu/g, respectively.