Influence of the Co Thickness Layers on the Magnetic and Structural Properties of Nanocrystalline [Nd-Fe-B-Nb-Cu/Co]×n Films
H. CHIRIAC, M. GRIGORAŞ, M. URSE

Abstract. Some results concerning the influence of the thickness of Co layers on the structural and magnetic properties of [NdFeBNbCu/Co]×n nanocrystalline films, when the total thickness of NdFeBNbCu layers was of 540 nm and the thickness of Co spacer layers was varied from 2 to 6 nm, are presented. As compared to the Ta/NdFeBNbCu/Ta films, the multilayer Ta/[NdFeBNbCu(180 nm)/Co(2 nm)]×3/Ta films annealed at 650°C for 20 minutes exhibit very good hard magnetic properties such as, the coercivity Hc of about 2.28 T, remanence Mr of about 0.94 T, energy product of 347 kJ/m³ and an increase in the Curie temperature of about 68°C.