Deposition of (Fe/Pd)_n film on medical 316L stainless steel stent surface

Near-equiatomic (Fe/Pd)_n multilayer films were deposited on the surface of medical 316L stainless steel stents by vacuum arc ion plating technology. The crystal structure, morphology and component of (Fe/Pd)_n multilayer films were studied by XRD, SEM, and electronic energy spectrum and the phase transformation was also analyzed. The magnetic performances of the samples were detected by CTCC-1 numeral magnetic flux and magnetic field measurement instrument. The results indicate that the optimum structure of superficial magnetic films on medical 316L steel stents is ″Pd/Fe/Pd″. After diffusion heat treatment, (Fe/Pd)_n films changed from face-center-cubic (fcc) structure to face-center-tetragonal (fct) structure. The film is uniform with high density and good bonding strength. At the same time, its effective magnetic strength is to up to 5 × 10^-4 T for 6 months.