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, K. Enpuku

研究成果: ジャーナルへの寄稿学術誌査読

56 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)203-205
ページ数3
ジャーナルApplied Physics Letters
72
2
DOI
出版ステータス出版済み - 1998

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)

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