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The oscillating magnetic microsphere: a tool for investigating vorticity in superconductors and superfluids

Niemetz, M. ; Schoepe, Wilfried ; Simola, J. T. ; Tuoriniemi, J. T.


A spherical magnet (radius 0.1 mm) is levitating between the superconducting electrodes of a parallel plate capacitor. Small vertical oscillations of the magnet about its equilibrium position can be excited. From the damping of the oscillations (in vacuum) dissipative processes due to flux motion in the superconductors have been measured. For YBCO thin-film electrodes at 4K Q-values are 106 ...


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