Spontaneous spinning of a magnet levitating over a superconductor
arXiv:cond-mat/0303574 · doi:10.1016/S0921-4534(03)01204-8
Abstract
A permanent magnet levitating over a superconductor is found to spontaneously spin, overcoming resistance to air friction. We explain the physics behind this remarkable effect.
See http://physics.ucsd.edu/~jorge/spinning.html for movie clips of the effect