Remanent Magnetic Field Distribution in Bi-2223/Ag Superconducting Tape

The magnetic-flux distribution inside an Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox mono-filamentary tape is measured using Scanning Hall Probe at the liquid nitrogen temperature from the z component of the magnetic field above its surface. The spatial resolution of the imaging is 100 μm. The two dimensional self field distribution for a superconducting tape with Ic = 10.2 A is studied in a remanent state after the removal of external magnetic field normal to the tape surface. The trapped field is found to be maximum at the core of the tape and the field distribution is not uniform throughout the tape. This non-uniformity in the field distribution indicates the existence of the defects or imperfections in the oxide core which might have introduced during the tape fabrication. The spatial distribution of the magnetic field in the remanent state is related to the internal current density through the Maxwell’s Equation.