This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1088/0256-307X/27/8/088502 in citations.
Effect of HTS Superconductors on the Homogeneity of Measurement Field in Low Field NMR Detection
Effect of HTS Superconductors on the Homogeneity of Measurement Field in Low Field NMR Detection
In recent years, superconducting quantum interference devices (SQUIDs) have been demonstrated to be useful in the low field nuclear magnetic resonance (NMR) measurements. The high temperature superconducting (HTS) SQUID used in our experiments has a frequency-independent sensitivity of 40-50 fT/Hz(1...
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Personal Name(s): | Dong, H. |
---|---|
Zhang, Y. / Krause, H.-J. / Xie, X. / Braginski, A.I. / Offenhäusser, A. | |
Contributing Institute: |
Institut für Bio- und Nanosysteme - Bioelektronik; IBN-2 JARA-FIT; JARA-FIT |
Published in: | Chinese physics letters, 27 (2010) S. 088502 |
Imprint: |
Bristol
IOP Publ.
2010
|
Physical Description: |
088502 |
DOI: |
10.1088/0256-307X/27/8/088502 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Chinese Physics Letters
27 |
Subject (ZB): | |
Publikationsportal JuSER |
In recent years, superconducting quantum interference devices (SQUIDs) have been demonstrated to be useful in the low field nuclear magnetic resonance (NMR) measurements. The high temperature superconducting (HTS) SQUID used in our experiments has a frequency-independent sensitivity of 40-50 fT/Hz(1/2). When a liquid nitrogen cooled LC circuit is employed to form a tuned circuit with the SQUID, the sensitivity of the system can be further enhanced. The LC circuit consists of a capacitor and a coil made of copper wire or HTS tape, which is inductively coupled to the SQUID. However, the homogeneity of the measurement field deteriorates because of the HTS tape coil in the proximity of the sample. In contrast, the thin film SQUID with a washer area of 1 cm(2) has no effect on the NMR signal. Therefore, the impairment of the measurement field homogeneity in the case of different superconducting elements nearby is discussed by examining the free induction decay signals at 9 kHz. It is found that a square superconducting film with an area of 1 cm(2) may compensate for the inhomogeneity of the measurement field after the adjustment of its position. |