Sensitive YBa2Cu3O7−x thin-film magnetometer
- 19 August 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (8) , 988-990
- https://doi.org/10.1063/1.106323
Abstract
Our YBa2Cu3O7−x thin‐film magnetometer consists of a dc superconducting quantum interference device with bi‐epitaxial Josephson junctions, fabricated on one chip, and a flux transformer with a multiturn input coil, fabricated on a second chip. Photolithographic processing is used to pattern all layers. The magnetometer operates in a flux‐locked loop at temperatures up to 81 K, with the flux transformer improving the magnetic field sensitivity by a factor of 83±3. The low‐frequency rms magnetic field noise scales approximately as 1/f1/2, where f is the frequency, with a magnitude of 0.6 pT Hz−1/2 at 10 Hz and 0.09 pT Hz−1/2 at 1 kHz with the magnetometer immersed in liquid N2.Keywords
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