Skip to main content

Application of a SQUID magnetometer to NMR at low temperatures


Using a SQUID magnetometer, changes in the nuclear magnetization of copper are observed when the nuclear spins absorb rf power at resonance. Since the detected flux change is directly proportional to the change in static magnetizationΔM, this method offers higher sensitivity at low frequencies than conventional NMR which responds todM/dt. The experimental arrangement for observingΔM at temperatures below1 K is described. The variation of signal amplitude with temperature and rf power is found to agree well with predictions from the Bloch equations. A comparison of the sensitivity of the SQUID magnetometer and conventional NMR methods shows the advantage of the new technique at low frequencies and for nuclear systems with broad lines and long spin-lattice relaxation times.

This is a preview of subscription content, access via your institution.


  1. 1.

    E. C. Hirschkoff, O. G. Symko, L. L. Vant-Hull, and J. C. Wheatley,J. Low Temp. Phys. 2, 653 (1970).

    Google Scholar 

  2. 2.

    J. H. Bishop, E. C. Hirschkoff, and J. C. Wheatley,J. Low Temp. Phys. 5, 607 (1971).

    Google Scholar 

  3. 3.

    A. H. Silver and J. E. Zimmerman,Appl. Phys. Lett. 10, 142 (1967).

    Google Scholar 

  4. 4.

    E. P. Day,Phys. Rev. Lett. 29, 540 (1972).

    Google Scholar 

  5. 5.

    D. J. Meredith, G. R. Pickett, and O. G. Symko,Phys. Lett. 42A, 13 (1972).

    Google Scholar 

  6. 6.

    A. J. Hildebrandt, H. Wahlquist, and D. Elleman,J. Appl. Phys. 6, 533 (1972).

    Google Scholar 

  7. 7.

    U. El-Hanany and D. Zamir,Phys. Rev. 183, 809 (1969).

    Google Scholar 

  8. 8.

    R. P. Giffard, R. A. Webb, and J. C. Wheatley,J. Low Temp. Phys. 6, 533 (1972).

    Google Scholar 

  9. 9.

    N. Bloembergen,Nuclear Magnetic Relaxation, (Benjamin, New York, 1961), p. 65.

    Google Scholar 

  10. 10.

    H. D. W. Hill and R. F. Richards,J. Sci. Instr. 1 (ser. 2), 977 (1968).

    Google Scholar 

  11. 11.

    R. A. Kamper, L. O. Mullen and D. B. Sullivan, NBS Technical note 381, p. 32 (1969).

  12. 12.

    J. Schratter and D. L. Williams,Phys. Rev. B 5, 4302 (1972).

    Google Scholar 

Download references

Author information



Rights and permissions

Reprints and Permissions

About this article

Cite this article

Meredith, D.J., Pickett, G.R. & Symko, O.G. Application of a SQUID magnetometer to NMR at low temperatures. J Low Temp Phys 13, 607–615 (1973).

Download citation


  • Copper
  • Relaxation Time
  • Magnetic Material
  • Signal Amplitude
  • Experimental Arrangement