Experimental and Numerical Investigation of the Levitation Force Between Bulk Permanent Magnet and ${\rm MgB}_{2}$ Disk

The experimental investigation of the levitation force between a Permanent magnet (PM) and MgB 2 disk prepared by means of the Reactive Mg Liquid Infiltration is presented. Both FC and ZFC levitation in the temperature range from 21 K to 37 K are considered. The long term behavior of the levitation force is also investigated. A numerical model is developed in order to investigate the electrodynamics of levitation. The hysteretic behavior of the levitation force is related to the dynamic of current penetration inside the MgB 2 disk by means of the numerical model.