LTS slotted SQUIDs for reduction of 1/f noise


Bartolomé, E. and López, R. and Flokstra, J. and Rogalla, H. (2002) LTS slotted SQUIDs for reduction of 1/f noise. Physica C: Superconductivity, 372-37 (Part 1). pp. 233-236. ISSN 0921-4534

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Abstract:We have developed Nb/Al dc SQUIDs with differently structured washers (including slots and/or holes, a moat surrounding the washer and a zipper slit) to study the reduction of 1/f noise owing to hopping of flux vortices, trapped in the SQUID body during the cool-down process. A gradual reduction of the 1/f noise (measured down to 0.2 Hz) was measured for SQUIDs with increasing number of slots. Holes proved to be less effective than slots in reducing the flicker noise. The 1/f noise of the SQUIDs with a moat and zipper slit was smaller than that of a bold SQUID, but the reduction of noise was on the average less significant than for the slotted SQUIDs.
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Copyright:© 2002 Elsevier
Science and Technology (TNW)
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