Low-noise YBa2Cu3O7-x single layer dc superconducting quantum interference device (SQUID) magnetometer based on bicrystal junctions with 30° misorientation angle

J. Beyer, D. Drung, F. Ludwig, T. Minotani, Keiji Enpuku

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We have fabricated and characterized a low-noise direct-coupled magnetometer based on a 100 pH YBa2Cu3O7-x dc superconducting quantum interference device (SQUID) on a 10 mm×10 mm SrTiO3 bicrystal substrate with 30° misorientation angle. The thin films were deposited by hollow cathode discharge sputtering and patterned using conventional photolithography and Ar ion beam etching. The SQUID magnetometer was operated using direct-coupled flux-locked-loop electronics with bias reversal. The sensor had a usable voltage swing of 39 μV and a white magnetic field noise of 32 fTHz-1/2 with a 1/f corner at 2 Hz, including electronics and environmental noise. The voltage versus flux (V-) characteristic showed a pronounced distortion on the negative slope. Numerical simulations were performed to explain the distorted V- characteristic. Measurements of magnetocardiograms demonstrate the suitability of this sensor for biomagnetic applications.

Original languageEnglish
Pages (from-to)203-205
Number of pages3
JournalApplied Physics Letters
Volume72
Issue number2
DOIs
Publication statusPublished - Dec 1 1998

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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