Influence of Ferromagnetic Substrate on the
Properties of Coated Conductor

F. Gömöry, M. Vojenciak, E. Pardo, J. Šouc

Abstract — Critical current and AC loss have been calculated for typical coated conductor tapes, taking into account anisotropic field-dependent critical current density in superconducting layer and non-linear magnetic properties of the substrate. The predictions achieved for the tape with Ni-5%W magnetic substrate are compared to the case of a non-magnetic substrate. Our results show that the substrate ferromagnetism reduces the critical currents in low magnetic fields. For parallel AC magnetic fields, the tape loss is given essentially by the hysteresis loss of the substrate. In an AC field perpendicular to the tape, the ferromagnetic substrate reduces the losses in superconductor. In the case of AC transport, substantial increase of the loss in superconductor is predicted on top of the additional hysteresis loss in the substrate. The use of a substrate wider than the superconductor could slightly reduce the transport losses as well as the magnetization losses in perpendicular field.

Full Text, PDF