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A SELF ROTATING MAGNET LEVITATING ABOVE A YBCO SPECIMEN.

Author(s) : MARTINI G., RIVETTI A., PAVESE F.

Type of article: Article

Summary

A PECULIAR PHENOMENON IS DESCRIBED, WHICH WAS FIRST OBSERVED DURING AN EXPERIMENT OF LEVITATION USING THE MEISSNER EFFECT, MADE WITH A YBCO SPECIMEN AND A NEODYMIUM-IRON-BORON MAGNET. ABOVE A PIECE OF YBCO COOLED TO LIQUID NITROGEN TEMPERATURE, A CYLINDRICAL MAGNET LEVITATES WITH ITS AXIS REMAINING HORIZONTAL. THE OSCILLATION AMPLITUDE INCREASES GRADUALLY, AND THE MAGNET FINALLY BEGINS TO ROTATE UNTIL A STEADY MEAN ANGULAR VELOCITY IS REACHED. AN EXPLANATORY HYPOTHESIS IS GIVEN, BASED UPON THE REVERSIBLE CHANGE OF MAGNETIC CHARACTERISTICS OF THE NEODYMIUM-IRON-BORON MAGNET, AS A CONSEQUENCE OF A ROTATING THERMAL GRADIENT ON ITS SURFACE. THE EXPERIMENTAL SET-UP USED FOR EVALUATING THE PHENOMENON IS DESCRIBED AND THE MEASUREMENTS SUPPORTING THE HYPOTHESIS ARE GIVEN AND DISCUSSED.

Details

  • Original title: A SELF ROTATING MAGNET LEVITATING ABOVE A YBCO SPECIMEN.
  • Record ID : 1991-2431
  • Languages: English
  • Source: Adv. cryog. Eng. - vol. 35 A
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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