Eizinger, P. and Schoepe, Wilfried and Gloos, K. and Simola, J. T. and Tuoriniemi, J. T.
Vibrations of a magnetic microsphere levitated above a superconductor: a high-Q oscillator for studies of vorticity in superconductors and superfluids.
Physica B: Condensed Matter 178 (1-4), pp. 340-346.
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The oscillations of a small magnetic sphere (radius 100 μm) levitated above a superconductor are investigated. Resonance frequencies between 300 Hz and 600 Hz are observed. At low amplitudes (≤1 gmm) the oscillator has Q values of about 106. At larger amplitudes both the resonance frequency and the damping become amplitude dependent. Nonlinear and hysteretic friction is attributed to vortex ...
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