Novel magnetic sensors using high Tc superconductors

K. Hirata, S. Ooi, S. Yu, E. H. Sadki, T. Mochiku

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We propose a novel magnetic sensor to apply a new phenomenon in high T c superconductors of strongly anisotropic materials. We have found periodic oscillations in the flux-flow resistance of Josephson vortices in intrinsic Josephson junctions of single crystalline Bi2Sr 2CaCu2Og+y fabricated by using a focused ion beam. The periodic oscillations in the flux-flow resistance have been observed at higher magnetic fields than 70 kOe at low temperatures. The period depends only on the junction width perpendicular to the magnetic fields and the current, independent of temperature and magnetic field. The detailed analyses of the oscillations show that the characteristics of the flux-flow device can be applied as magnetic sensors to detect an absolute magnetic field and to measure the field precisely to an accuracy in the 1 mOe range, even under magnetic fields as high as 70 kOe. We believe that this kind of sensor opens up new applications of high Tc superconductors.

Original languageEnglish
Pages (from-to)S432-S435
JournalSuperconductor Science and Technology
Issue number5
Publication statusPublished - May 2004
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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