The dynamics of a levitated cylindrical permanent magnet above a superconductor.

Título inglés	The dynamics of a levitated cylindrical permanent magnet above a superconductor.
Título español	La dinámica de un imán permanente cilíndrico levitando sobre un superconductor.
Autor/es	Schreiner, Michael
Organización	Interstate Univ. Appl. Sci. Technol. Lab. Ind. Math., Buchs, Suiza
Revista	1139-1138
Publicación	2003, 16 (2): 495-517, 13 Ref.
Tipo de documento	articulo
Idioma	Inglés
Resumen inglés	When a permanent magnet is released above a superconductor, it is levitated. This is due to the Meissner-effect, i.e. the repulsion of external magnetic fields within the superconductor. In experiments, an interesting behavior of the levitated magnet can be observed: it might start to oscillate with increasing amplitude and some magnets even reach a continuous rotation. In this paper we develop a mathematical model for this effect and identify by analytical methods as well with finite element simulations two reasons for the described behavior of the levitated magnet. It is shown, that the oscillations of the magnet are due to inhomogeneities of the magnetization within the magnet, whereas the continuous rotations are due to temperature gradients of the surrounding air.
Clasificación UNESCO	120613
Palabras clave español	Imanes permanentes ; Levitación magnética ; Superconductores ; Efecto Meissner ; Modelos matemáticos ; Ecuaciones parabólicas ; Ecuación del calor
Código MathReviews	MR2032930
Código Z-Math	Zbl pre02076541
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