Nuclear magnetic resonance with DC SQUID preamplifiers

Author

Fan, N.Q. ; Heaney, Michael B. ; Clarke, John ; Newitt, D. ; Wald, Lawrence L. ; Hahn, Erwin L. ; Bielecki, A. ; Pines, A.

Author_Institution

California Univ., Berkeley, CA, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

1193

Lastpage

1199

Abstract

Describes five experiments illustrating the application of DC SQUID (superconducting quantum interference device) amplifiers to magnetic resonance experiments. The first experiment involved the observation of nuclear spin noise, that is the spontaneous emission of photons from an ensemble of ³⁵Cl nuclei in the zero polarization state. The second experiment involved the use of the Q -spoiler in conventional NQR (nuclear quadrupole resonance) and NMR measurements in which one applies a large RF pulse to the nuclei to make them precess. The Q-spoiler was then used in an experiment to detect the oscillating electric polarization induced by ³⁵Cl nuclear quadrupole moments. The fourth experiment involved the extension of the use of the Q-spoiler and SQUID amplifier to NMR, detecting the signal from ¹¹⁹Sn nuclei at 30 MHz. Finally, a SQUID amplifier was used with an untuned input circuit to detect the low-frequency NMR signal at 55 kHz from ¹⁹⁵Pt nuclei in an applied field of 60 Gauss

Keywords

SQUIDs; nuclear quadrupole resonance; preamplifiers; 30 MHz; 55 kHz; ¹¹⁹Sn nuclei; ³⁵Cl nuclei; DC SQUID preamplifiers; NMR; Q-spoiler; magnetic resonance experiments; nuclear quadrupole resonance; nuclear spin noise; oscillating electric polarization; spontaneous emission; untuned input circuit; zero polarization state; Interference; Magnetic noise; Magnetic resonance; Nuclear magnetic resonance; Polarization; Preamplifiers; Pulse measurements; SQUIDs; Superconducting device noise; Superconducting devices;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92510

Filename

92510