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Magnetic field-induced noise in directly coupled high Tc superconducting quantum interference device magnetometers

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3 Author(s)
Milliken, F.P. ; IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598 ; Brown, S.L. ; Koch, R.H.

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We have measured the noise of several directly coupled high Tc superconducting quantum interference device (SQUID) magnetometers as we change a static magnetic field B while the devices are superconducting. Devices without “flux dams” show an increase in noise at relatively low magnetic fields B∼1 μT. Devices with flux dams can show no deterioration of the noise characteristics for B as large as 34 μT. The flux dams are part of the pickup loop and limit the circulating current Icirc. If Icirc is kept sufficiently low no vortices are forced into the SQUID loop and the noise performance of the magnetometer remains good. © 1997 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:71 ,  Issue: 13 )

Date of Publication:

Sep 1997

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