Abstract
Both high levitation pressures (up to 22 N cm-2) and highrestoring pressures (up to 11 N cm-2) are obtained for a superconductingtrapped field magnet of 1.5 T levitating above the centre of a ring ofzero-field cooled high-temperature superconductors. The ratio of levitationforce to restoring force can be varied between 2.9 and 0.3 by changing thequality of the superconductors. This significantly improves the stability oflevitation compared to commonly used single sample configurations.
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