We present the improved Superconducting Quantum Interference Devices (SQUID) for magnetic microscopy and for nanoscale investigations. Low critical Temperature SQUIDs with integrated micro pick-up coils (with inner diameter ranging from 5 to 50 μm) which can be used as magnetic field sensors in magnetic microscopy have been developed. The level of flux noise spectral density, measured in flux locked loop configuration and using a direct coupled scheme, is about in the white region at T = 4.2 K. A high sensitive dc-SQUID based on niobium Dayem bridges for nanomagnetism is presented. The sensor has a flux capture area as low as 0.04 μm2, allowing the study of nano-object magnetic properties. The authors report the main design rules of the devices, the fabrication processes and their characterization including also the supercurrent decay measurements at T = 4.2 K. © 2010 Springer Science+Business Media B.V.
CITATION STYLE
Vettoliere, A., Granata, C., Walke, P., Esposito, E., Ruggiero, B., & Russo, M. (2010). Squid sensors for high spatial resolution magnetic imaging and for nanoscale applications. In Lecture Notes in Electrical Engineering (Vol. 54 LNEE, pp. 251–255). https://doi.org/10.1007/978-90-481-3606-3_49
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