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Browse Journals & Magazines > Applied Physics Letters ...> Volume:91 Issue:14 Help

Nuclear magnetic resonance on room temperature samples in nanotesla fields using a two-stage dc superconducting quantum interference device sensor

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9 Author(s)
Korber, R. ; Department of Physics, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom ; Casey, A. ; Shibahara, A. ; Piscitelli, M.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2794028 

We describe a compact system for pulsed nuclear magnetic resonance at ultralow magnetic fields on small liquid samples (∼0.14 ml) at room temperature. The broadband spectrometer employs an integrated two-stage superconducting quantum interference device current sensor with a coupled energy sensitivity of 50h, in the white noise limit. Environmental noise is screened using a compact arrangement of mu-metal and a superconducting shield. Proton signals in water have been observed down to 93 nT (a Larmor frequency of 4.0 Hz), with a minimum linewidth of 0.16 Hz measured at ∼40 Hz. Two-component free induction decays were observed from oil/water mixtures between 275 and 300 K.

Published in:
Applied Physics Letters  (Volume:91 ,  Issue: 14 )

Date of Publication: Oct 2007

Page(s):
142501 - 142501-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2794028
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Oct 2007

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