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, Keiji Tsukada

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2 Citations (Scopus)


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
JournalPhysica C: Superconductivity and its Applications
Publication statusPublished - Nov 2000
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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