Magnetic field-induced noise in directly coupled high T{sub c} superconducting quantum interference device magnetometers
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
We have measured the noise of several directly coupled high T{sub c} superconducting quantum interference device (SQUID) magnetometers as we change a static magnetic field B while the devices are superconducting. Devices without {open_quotes}flux dams{close_quotes} show an increase in noise at relatively low magnetic fields B{approximately}1 {mu}T. Devices with flux dams can show no deterioration of the noise characteristics for B as large as 34 {mu}T. The flux dams are part of the pickup loop and limit the circulating current I{sub circ}. If I{sub circ} is kept sufficiently low no vortices are forced into the SQUID loop and the noise performance of the magnetometer remains good. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 542527
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 13 Vol. 71; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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