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Vibrations of a magnetic microsphere levitated above a superconductor: a high-Q oscillator for studies of vorticity in superconductors and superfluids

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Eizinger, P. ; Schoepe, Wilfried ; Gloos, K. ; Simola, J. T. ; Tuoriniemi, J. T.
Date of publication of this fulltext: 20 Dec 2010 13:59


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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