Saturday, 3F-04, 9:00-9:10

Influence of Ferromagnetic Substrate on the Properties of Coated Conductor

Fedor Gömöry

M. Vojenciak, E. Pardo, J. Souc

Institute of Electrical Engineering, Centre of Excellence CENG, Slovak Academy of Sciences, Dubravska cesta 9, 842 39 Bratislava, Slovakia
Tel. (+4212) 5477 5820 Fax: (+4212) 5477 5816 e-mail: elekgomo@savba.sk

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. Two geometries have been considered: the substrate exactly fitting the superconducting layer, and the substrate exceeding in width the superconducting layer by 10%. 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 tape with ferromagnetic substrate exhibits the losses reduced compared to the non-magnetic substrate. In the case of transport loss, substantial increase of the loss in superconductor is predicted on top of the additional hysteresis loss in the substrate. The use of a wider substrate could slightly reduce the transport losses and the magnetization losses in perpendicular field.

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