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The magnetic properties of heat treated O-series high temperature superconducting (HTS) GdBCO coated conductor (CC) tapeswhich were formed of Ag/GdBCO/Buffer-layers/Stainless Steel (SS), were investigated by employing a Quantum Design PPMS-14. Using a modified Bean model, the critical current density Jc values have been estimated from the mirr(H) data, which are obtainedby measuring the magnetic moment m(H) loops. For a range of intermediate fields, which are interacting or collective flux pinningarea, the magnetic flux behaviors were investigated from the relationship Jc H-. In addition, the changes of irreversibilitymagnetic field Hirr line of heat-treated O-series HTS GdBCO CC tapes were analyzed, according as the annealing temperature underoxygen flowing increases. Both weak and strong break-downs were found by examining the changes of irreversibility magneticfield Hirr lines.
