Measurements of three-dimensional fields of bulk superconductors in varying external fields

N. Yamachi, Naomichi Sakai, K. Sawa, Masato Murakami

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We measured the magnetic field distribution and the levitation force of a bulk Sm-Ba-Cu-O superconductor as it was moved vertically in magnetic fields generated from a Bi-Sr-Ca-Cu-O superconducting magnet. The levitation forces strongly depended on a radial component of the external magnetic field. We measured magnetic fields on the surface and the interior of the bulk superconductor using a three-dimensional Hall sensor device. The field distribution could be understood by assuming that the shielding currents are flowing concentrically at the periphery as predicted by the critical state model. We also found that the flux lines were not straight but slightly curved due to a cylindrical geometry of the samples.

Original languageEnglish
JournalSuperconductor Science and Technology
Volume18
Issue number2
DOIs
Publication statusPublished - 2005 Feb

Fingerprint

Superconducting materials
Magnetic fields
levitation
magnetic fields
Superconducting magnets
superconducting magnets
Shielding
shielding
Fluxes
Geometry
sensors
Sensors
geometry

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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AB - We measured the magnetic field distribution and the levitation force of a bulk Sm-Ba-Cu-O superconductor as it was moved vertically in magnetic fields generated from a Bi-Sr-Ca-Cu-O superconducting magnet. The levitation forces strongly depended on a radial component of the external magnetic field. We measured magnetic fields on the surface and the interior of the bulk superconductor using a three-dimensional Hall sensor device. The field distribution could be understood by assuming that the shielding currents are flowing concentrically at the periphery as predicted by the critical state model. We also found that the flux lines were not straight but slightly curved due to a cylindrical geometry of the samples.

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