Josephson junction array for high-frequency current probe

  • Enpuku K
  • Hijiya S
  • Nakahodo A
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We propose the use of a high-TcJosephson junction array for the measurement of high-frequency magnetic fields with high spatial resolution. In this application, the magnetic field B is converted to the voltage V by using the V-B relationship of the bicrystal junction. For the design of the array, the parameter dependence of the conversion efficiency dV/dB is examined both theoretically and experimentally. The eight-junction array fabricated with an area of 120 × 50 μm2showed the conversion efficiency dV/dB = 70 and 260 V/T at T = 77 and 60 K, respectively. The value of dV/dB = 260 V/T indicates that the array is more sensitive, up to 7 GHz, than the conventional induction coil having the same area. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Bicrystal junction array
  • Flux focusing Effect
  • V-B relation
  • Wide junction

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  • K. Enpuku

  • S. Hijiya

  • A. Nakahodo

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