Generation of quasi-reversibility in a commercial Bi:2223/Ag tape by vortex shaking with varying orthogonal magnetic fields

The magnetizations 〈 M ⊥〉 of strips of BiSCCO tapes are seen to evolve towards a common diamagnetic 〈 M ⊥〉 versus H ⊥ curve, hence display quasi-reversibility, from the application of a few cycles of a magnetic field H ∥ directed along their length, when previously magnetized, (i) to critical paramagnetic or diamagnetic states along the major hysteresis loop by an excursion of a transverse magnetic H ⊥ piercing the flat surfaces and now held fixed or, (ii) by field cooling in static H ⊥. The remanent magnetic moment along H ∥ when the cycling ceases is made to vanish by a simple demagnetization procedure which homogenizes the flux trapped along H ∥.