Evaluating the entry of vortices into a slotted high-Tc SQUID magnetometer with a double-pickup-coil configuration

K. Yokosawa, H. Oyama, S. Kuriki, D. Suzuki, K. Tsukada

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

A direct-coupling-type high-Tc SQUID magnetometer with two pickup loops per SQUID on a substrate has been fabricated. To suppress the flux trapping and vortex entry, the superconducting film of the whole device except a 5-μm-wide transmission-line-shaped SQUID is composed of narrow (5 μm) lines with slots and holes. The threshold field for the flux trapping during field cooling was evaluated to be around 130 μT, a much larger field than the geomagnetic field. Moreover, applying a field after cooling reduced the critical current of the SQUID to zero at 6 μT. And vortex entry into the pickup loop occurred at a field exceeding about 10 μT.

Original languageEnglish
Pages (from-to)2705-2706
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume341-348 (IV)
DOIs
Publication statusPublished - Nov 2000
Externally publishedYes
EventInternational Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA
Duration: Feb 20 2000Feb 25 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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