Josephson junction array for high-frequency current probe

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We propose the use of a high-Tc Josephson 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 μm2 showed 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.




Enpuku, K., Hijiya, S., & Nakahodo, A. (2002). Josephson junction array for high-frequency current probe. Physica C: Superconductivity and Its Applications, 367(1–4), 256–259.

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