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An iron-core magnetic inductance probe to measure critical current densities in superconducting thin films.

Author(s) : HYLTON T. L., BEASLEY M. R., TABER R. C.

Type of article: Article

Summary

The probe is capable of rapid measurement in a noncontacting, nondestructive fashion. The use of an iron core enables the authors to generate field levels at the sample surface of 4000 A/cm (0.5 T) and thereby to measure a critical current density of 8 x 10 millions A/cm² in a film 0.5 micrometer thick. The technique provides the ability to measure a current-voltage relationship without contacting the film and, thereby, to establish criteria for the definition of a critical current. The authors discuss the design, operation, and calibration of the device. The probe has proven effective in evaluating YBCO thin films. Evidence of "flux creep" in YBCO films and "flux jumps" in niobium and niobium cyanide films is observed.

Details

  • Original title: An iron-core magnetic inductance probe to measure critical current densities in superconducting thin films.
  • Record ID : 1993-1236
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 63 - n. 4 (I)
  • Publication date: 1992/04
  • Document available for consultation in the library of the IIR headquarters only.

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