Influence of DC Magnetic Field on AC Loss of YBCO Coated Conductor with Ferromagnetic Substrate
M. Vojenčiak, J. Šouc, F. Gömöry and E. Seiler
Institute of Electrical Engineering, Centre of Excellence CENG, Slovak Academy of Sciences, D'ubravská cesta 9, 841 04 Bratislava, Slovakia
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Received: 9 07 2007;
Most of YBCO tape conductors are prepared on a ferromagnetic substrate. The ferromagnetic material is then exposed to the self magnetic field of the superconductor and also to external magnetic field. In AC magnetic field hysteretic and eddy current losses are generated in the substrate. In this work the AC transport loss of an YBCO coated conductor on a ferromagnetic substrate was measured using electromagnetic method. There are two contributions to total loss - a loss in the superconductor and a loss in the substrate. To suppress the hysteretic loss in the substrate, it is possible to saturate it using DC magnetic field. In this regime significant decrease in total loss was observed.
DOI: 10.12693/APhysPolA.113.359
PACS numbers: 74.25.Fy, 74.25.Nf, 74.78.Bz, 75.50.-y