Influences of surface barrier on AC loss in Ag-Bi2223 tapes by simulation

Influences of surface barrier in Ag-Bi2223 tapes on AC loss are studied. The Ag-Bi2223 tape is described by a surface region (near to the silver) and a bulk region, which are depicted by different critical current densities jcs and jcb, respectively. Simulations using the flux creep model indicate that with surface barrier increasing, a kink then a dip appear in the AC loss and the peak and dip positions move to higher magnetic fields. The results can be used as an effective method to qualitatively estimate the surface barrier strength.