Precession of spinning magnets levitated over high-temperature superconductors

Both the experimental and theoretical aspects of the precession of a magnet over both a melt-processed and sintered high-temperature superconductor are explored. The freely levitated magnet is spun to high frequencies to obtain a large angular momentum, and tilted using a second magnet. The levitate...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1998-02, Vol.295 (3), p.304-329
Main Authors: Rossman, Court E., Budnick, Joseph I.
Format: Article
Language:English
Subjects:
AC susceptibility of superconductors
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current density
Exact sciences and technology
Flux creep
Granular superconductivity
Levitation
Magnetic properties
Physics
Precession
Properties of type I and type II superconductors
Superconductivity
Torques
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Summary:Both the experimental and theoretical aspects of the precession of a magnet over both a melt-processed and sintered high-temperature superconductor are explored. The freely levitated magnet is spun to high frequencies to obtain a large angular momentum, and tilted using a second magnet. The levitated magnet slowly precesses about a position at least close to the center of mass of the magnet, and the tilt angle decays back to the original orientation. A simple torque equation is used to obtain the applied torque from the measured rate of change of the tilt angle and the precession angle. We discuss how to relate the torques to the moments in the superconductor.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(97)01611-0