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The dependence of the magnetic field strength required for levitation of amelt textured, single domain YBCO superconductor disc on the frequency of thecurrent generating the levitating magnetic field has been investigated. Themagnetic field strength is found to be independent of frequency between 10 and300 Hz. This required field strength is found to be in good experimental andtheoretical[1] agreement with the field strength required to levitate the samesuperconductor with a non-oscillating magnetic field. Hysteretic losses withinthe superconductor predicted by Bean's critical-state model[2] were alsocalculated. The measured data rules out any significant Bean's model effects onthe required levitation field strength within the measured frequency range.

Dependence of Levitation Force on Frequency of an Oscillating Magnetic Levitation Field in a Bulk YBCO Superconductor