Magnetometers based on double relaxation oscillation superconducting quantum interference devices

Derk Jan Adelerhof, Jun Kawai, Keiji Tsukada, Gen Uehara, Hisashi Kado

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Magnetometers based on double relaxation oscillation superconducting quantum interference devices (SQUIDs) (DROSs) have been fabricated and characterized. The DROSs are based on 2×2μm2Nb/AlOx tunnel junctions and have a 25 turn, tightly coupled input coil. The high flux-to-voltage transfer coefficient of 1-2mV/φ0 facilitates direct voltage readout by a low-noise dc amplifier. The pickup coil consists of a thin-film Nb gradiometer with a baseline of 40 mm and an inductance of 110 nH. The white field noise of the magnetometer was better than 5 ft/Hz, which is sufficient for magnetoencephalography measurements.

Original languageEnglish
Number of pages1
JournalApplied Physics Letters
DOIs
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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