Advancement in fabrication process of Fe–Cu–Nb–Si–B thin sheets with creep-induced anisotropy for choke cores

Abstract Fe-based gapless cores, which were made from nanostructured Fe–Cu–Nb–Si–B thin sheets with creep-induced anisotropy, have a promising potential for a new stage of choke cores because of their low loss and high saturation magnetization. It was clarified that an application of tensile stress during crystallization and an increase in heating rate enable us to reduce the tensile stress needed for inducing the anisotropy.