AC loss in stacks of Bi-2223/Ag tapes modified with ferromagnetic covers at the edges

• Published in: Superconductor science & technology Vol. 23; no. 10; p. 105003
• Main Authors: Safran, S, Gömöry, F, Gencer, Ali
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.10.2010; Institute of Physics
• Subjects: Applied sciences; Coils (windings); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrical engineering. Electrical power engineering; Exact sciences and technology; Ferromagnetism; MAGNETIC PROPERTIES; Magnetization; Materials; MATHEMATICAL ANALYSIS; Physics; Properties of type I and type II superconductors; Silver; STACKS; Superconducting tapes; Superconductivity; SUPERCONDUCTORS; TAPE; WINDING; Critical current density; Iron loss; Magnetization; Superconducting tapes; Empirical method; Ferromagnetic materials; Numerical simulation; Bismuth Calcium Copper Strontium Oxides Mixed; Magnetic thin films; Magnetic susceptibility
• ISSN: 0953-2048; 1361-6668
• DOI: 10.1088/0953-2048/23/10/105003

We investigated the magnetization loss of stacked Bi-2223/Ag tapes with a ferromagnetic cover on the edges. Such modification has been found recently to reduce the AC loss of a single tape; however, the behavior in a coil winding could be different. With experiments and numerical calculations we show that a ferromagnetic cover on the edges of a superconducting tape could reduce its magnetization loss also when the tapes are arranged in a stack. The effect is weaker for larger numbers of tapes but nevertheless remained significant in a stack of four tapes, which was the maximum number studied here. The effects observed experimentally are nicely explained by the results of numerical calculations.