Flux pinning characteristics in ultrafine multifilamentary NbTi superconductors with different artificial pin materials

In order to improve and design critical current densities in commercial superconductors, the establishment of an artificial pinning center composite technique based on the flux pinning mechanism is desired. For that purpose, we studied the influence of different kinds of artificial pin materials (Nb, Nb-7.5wt.%Ta, Ta) on the flux pinning in multifilamentary NbTi superconductors. It was found that ...