A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam

G. Burnell; D. -J. Kang; D. A. Ansell; H. -N. Lee; S. -H. Moon; E. J. Tarte; M. G. Blamire

doi:10.1063/1.1491599

A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam

Superconductivity 2009-11-07 v1

Authors: G. Burnell , D. -J. Kang , D. A. Ansell , H. -N. Lee , S. -H. Moon , E. J. Tarte , M. G. Blamire

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Abstract

We report the fabrication of a directly coupled superconducting quantum interference device (SQUID) magnetometer in MgB2 using a focused ion beam (FIB) to create Josephson junctions in a 70 nm thick film of MgB2. The SQUID shows a voltage modulation (deltaV) of 175 mV at a temperature of 10 K and operates over a temperature range from 10 K to 24 K. We find excellent agreement between the measured maximum transfer functions and those predicted by theory. We have measured the magnetic flux noise at 20 K to be as low as 14 micro Phi-0 per root Hz.

Keywords

SQUID magnetometer magnesium diboride focused ion beam Josephson junctions flux noise

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@article{arxiv.cond-mat/0203532,
  title  = {A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam},
  author = {G. Burnell and D. -J. Kang and D. A. Ansell and H. -N. Lee and S. -H. Moon and E. J. Tarte and M. G. Blamire},
  journal= {arXiv preprint arXiv:cond-mat/0203532},
  year   = {2009}
}

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11 pages, 4 figures

A Directly Coupled Superconducting Quantum Interference Device Magnetometer Fabricated in Magnesium Diboride by Focused Ion Beam

Abstract

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