We derive the analytical expressions describing the magnetic force experienced by a thin superconducting disk when being displaced in the presence of the magnetic field of a permanent magnet. The important demagnetization effects associated with the film geometry are taken into account. The model explains the characteristic features observed in the experiments. In particular, the results for the levitation force and its dependence on the film thickness are compared with published experimental data, showing good agreement.
- Applications of high-T c