NanoSQUIDs: Basics & recent advances

@article{JosMartnezPrez2016NanoSQUIDsB,
  title={NanoSQUIDs: Basics \& recent advances},
  author={Maria Jos{\'e} Mart{\'i}nez-P{\'e}rez and Dieter Koelle},
  journal={Physical Sciences Reviews},
  year={2016},
  volume={2}
}
Abstract Superconducting Quantum Interference Devices (SQUIDs) are one of the most popular devices in superconducting electronics. They combine the Josephson effect with the quantization of magnetic flux in superconductors. This gives rise to one of the most beautiful manifestations of macroscopic quantum coherence in the solid state. In addition, SQUIDs are extremely sensitive sensors allowing us to transduce magnetic flux into measurable electric signals. As a consequence, any physical… 
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References

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TLDR
It is shown that nanoscale SQUIDs with diameters as small as 46 nm can be fabricated on the apex of a sharp tip, and they can operate over a wide range of magnetic fields, providing a sensitivity of 0.6 μB Hz(-1/2) at 1 T.
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The sensitivity of nanoscale SQUIDs (nanoSQUIDs; SQUID: superconducting quantum interference device) to single and small populations of magnetic dipoles is considered. The simple estimate given
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TLDR
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