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Title: Type-I superconductor pick-up coil in superconducting quantum interference device-based ultra-low field nuclear magnetic resonance

In ultra-low field nuclear magnetic resonance (ULF-NMR) with strong prepolarization field (B{sub p}), type-II superconducting pick-up coils may be vulnerable to flux pinning from the strong B{sub p}. Pick-up coils made of NbTi, Nb, and Pb were evaluated in terms of acquired NMR signal quality. The type-II pick-up coils showed degraded signals above 61 mT maximum exposure, while the Pb pick-up coil exhibited no such degradation. Furthermore, a negative counter pulse following a strong B{sub p} was shown to follow magnetic hysteresis loop to unpin the trapped flux in the type-II pick-up coil and restore the NMR signal.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [2]
  1. Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of)
  2. Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin (Germany)
  3. (Germany)
Publication Date:
OSTI Identifier:
22283175
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HYSTERESIS; LEAD; MAGNETIC FLUX; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; PULSES; SQUID DEVICES; SUPERCONDUCTING COILS; TRAPPING; TYPE-II SUPERCONDUCTORS