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DC SQUID Spectrometers for NMR

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Abstract

We report experiments in which we have used DC SQUIDs in pulsed NMR spectrometers to observe directly the free precession of nuclear spins. A broadband spectrometer, which operates in flux-locked loop mode with a bandwidth of 3.4 MHz using a SQUID with additional positive feedback and an untuned superconducting input circuit, has been used to observe NMR signals from platinum powder at frequencies of 38, 65, 85, 240 and 513 kHz. The performance is compared with a second system in which a DC SQUID is operated open loop as a small signal rf amplifier with a series tank input circuit tuned at 1 MHz.

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Authors and Affiliations

  1. Department of Physics, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom

    Junyun Li, C. P. Lusher, M. E. Digby, B. Cowan & J. Saunders

  2. Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, D-10587, Berlin, Germany

    D. Drung & T. Schurig

Authors
  1. Junyun Li
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  2. C. P. Lusher
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  3. M. E. Digby
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  4. B. Cowan
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  5. J. Saunders
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  6. D. Drung
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  7. T. Schurig
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Li, J., Lusher, C.P., Digby, M.E. et al. DC SQUID Spectrometers for NMR. Journal of Low Temperature Physics 110, 261–267 (1998). https://doi.org/10.1023/A:1022568213093

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  • DOI: https://doi.org/10.1023/A:1022568213093

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