Critical magnetization current density and repulsive force determined by repulsive method

Determination of the critical magnetization current density of large superconducting samples was performed using a levitation force method. It is based on measurement of the force between the superconductor and a permanent Nd-Fe-B magnet, thus the applied magnetic field may be up to /spl sim/0.4 tesla. At this field, levitation forces up to 6.6 N (5.5 MN/m/sup 3/) were measured on melt processed tablets of Y-Ba-Cu-O material with dimensions of /spl sim/2 cm/spl times/2 cm/spl times/0.3 cm.