Abstract
We have used a superconductor-normal metal-superconductor (SNS) step-edge technique to produce low-noise dc SQUIDs operating at 77 K. The device fabrication process is both reproducible and manufacturable, and is targeted for commercial use. The superconductor is YBa2Cu3O7−δ and the normal metal is typically a Ag-Au alloy. At 77 K, the energy sensitivity for the SQUIDs with the smallest inductance, L = 12 pH, reaches below 9 × 10−30 J/Hz at 1 Hz and is 8 × 10−29 J/Hz at 100 Hz. The energy sensitivity for larger SQUIDs with L = 70 pH is 5 × 10−29 J/Hz at 1 Hz and 3 × 10−29 J/Hz at 100 Hz, values that are sufficient for many practical applications. A multi-level high-Tc technology has also been developed. This has resulted in the fabrication of a SQUID magnetometer consisting of a washer-style SQUID coupled to a multi-turn input coil and a large area pickup coil, all on the same substrate.
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References
Ferrari MJ, Johnson M, Wellstood FC, Clarke J, Inam A, Wu XD, Nazar L, Venkatesan T (1989) Nature 341: 723–725,
Dilorio MS, Yang K-Y, Zhang J, Yoshizumi S, Maung M (1991) IEEE Trans. Magn., 27: 2573–2577
Dilorio MS, Yoshizumi S, Maung M, Yang K-Y, Zhang J, Fan NQ (1991) Nature 354: 513–515
Friedl G, Vildic M, Roas B, Uhl D, Bommel F, Romheld M (1992) Appl. Phys.Lett. 60: 3048–3050
Olsson HK, Nilsson P-A, Ivanov Z, Koch RH, Stepantosv EA, Tzalenchuk AYa (1992) Appl. Phys. Lett. 61: 861–863
Kingston JJ, Wellstood FC, Lerch P, Miklich AH, Clarke J (1990) Appl. Phys. Lett. 56: 189-191
Lee AE, Piatt CE, Burch JF, Simon RW, Goral JP, Al-Jassim MM (1990) Appl. Phys. Lett. 57: 2019–2021
Wu XD, Dye RC, Muenchausen RE, Foltyn SR, Maley M, Rollett AD, Garcia AR, Nogar NS (1991) Appl. Phys. Lett. 58: 2165–2167
Miklich AH, Kingston JJ, Wellstood FC, Clarke J, Colclough MS, Char K, Zaharchuk G (1991) Appl. Phys. Lett. 59: 988–990
Oh B, Koch RH, Gallagher WJ, Robertazzi RP, Eidelloth W (1991) Appl. Phys. Lett. 59: 123–125
Dilorio MS, Yoshizumi S, Yang K-Y, Zhang J, Maung M (1991) Appl. Phys. Lett. 58: 2552–2554
Dilorio MS, Yoshizumi S, Yang K-Y, Zhang J, Maung M, Fan N (1992) In: Koch H, Lubbig H, (eds) Superconducting Devices and Their Applications Springer-Verlag, Berlin 120–126
Dilorio MS, Yoshizumi S, Yang K-Y, Maung M, Zhang J, Power B to appear in proceedings of 1992 Applied Superconductivity Conference ( 1993 IEEE Trans. Magn. )
Ono RH, Beall JA, Cromar MW, Harvey TE, Johansson ME, Reintsema, Rudman DA (1991) Appl. Phys. Lett. 59: 1126–1128
Jaycox JM, Ketchen MB (1981) IEEE Trans. Magn. MAG-17: 400–403
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DiIorio, M.S., Yoshizumi, S., Yang, KY., Zhang, J., Maung, M., Power, B. (1993). High-Tc Low-Noise dc SQUIDs Operating at 77K. In: Bando, Y., Yamauchi, H. (eds) Advances in Superconductivity V. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68305-6_260
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DOI: https://doi.org/10.1007/978-4-431-68305-6_260
Publisher Name: Springer, Tokyo
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