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Effects of flux dam on low-frequency noise in high-Tc SQUID magnetometers

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3 Author(s)
Oyama, H. ; Res. Inst. for Electr. Sci., Hokkaido Univ., Sapporo, Japan ; Kuriki, S. ; Matsuda, M.

We demonstrated that the low-frequency noise in a high-Tc superconducting quantum interference device (SQUID) magnetometer when an external magnetic field is changed could be reduced by forming slots in a flux dam. We designed and fabricated directly coupled dc SQUID magnetometers having a mesh structure and flux dams. In order to suppress the vortex motion in the flux dams, we formed 5-μm-wide strip lines and slots across the grain boundary of the flux dams. The output of the magnetometer in a flux-locked loop (FLL) operation became stable and low-frequency noise was suppressed up to an applied field of 83 μT in field cooling and 40 μT for field change after zero field cooling. The importance of the structure of the flux dam in controlling the vortex motion is discussed

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Mar 2001

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