James L. Sanford, Eugene S. Schlig, et al.
Proceedings of SPIE - The International Society for Optical Engineering
The levitation of a permanent magnet over a type-II superconductor may be modified and controlled by the addition of a variable magnetic field to the magnet-superconductor system. Using this scheme, levitation of a magnet of significantly larger mass was established by the direct interaction of the additonal field with the levitating magnet.