Abstract
We have studied magnetic flux distribution dynamics in silver sheathed Bi-2223 superconducting tapes at 77 K using a novel Hall sensor technique. The flux distribution exhibits a strongly time dependent behaviour due to thermally activated flux creep in the intergranular current system. In applied constant fields the decrease of measured magnetic field profiles was due to a logarithmic relaxation in time of induced intergranular screening currents. In slowly swept AC magnetic fields the flux distribution dynamics wasgoverned by a continuous relaxation of intergranular screening currents. The screening current density was logarithmically dependent on the sweep rate of the applied field.
| Original language | English |
|---|---|
| Pages (from-to) | 1855-1858 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 30 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jul 1994 |
| MoE publication type | A1 Journal article-refereed |