Design of NMR RF Probe Constructed With High-Temperature Superconducting Elliptical-Coupled Resonators

A high-temperature superconducting (HTS) radio frequency (RF) probe has been designed for nuclear magnetic resonance spectroscopy that is constructed of two newly developed HTS elliptical-coupled resonators that are placed on either side of the sample. The probe has a higher quality factor and a mor...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2019-08, Vol.29 (5), p.1-4
Main Authors: Sekiya, Naoto, Yoshioka, Emi, Hoshi, Haruki, Saito, Atsushi, Ohshima, Shigetoshi
Format: Article
Language:English
Subjects:
Aluminum oxide
Dependence
High temperature
High-temperature superconductors
Magnetic field measurement
Magnetic fields
NMR
NMR spectroscopy probe
Nuclear magnetic resonance
Probes
Q factors
quality factor
Radio frequency
Resonators
RF probe
Substrates
Superconductivity
Thin films
thin-film resonator
YBCO superconductors
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Summary:A high-temperature superconducting (HTS) radio frequency (RF) probe has been designed for nuclear magnetic resonance spectroscopy that is constructed of two newly developed HTS elliptical-coupled resonators that are placed on either side of the sample. The probe has a higher quality factor and a more uniform magnetic field along the z-axis than one with square resonators. The measured unloaded quality factor (Qu) of a pair of elliptical-coupled resonators fabricated using YBa2Cu3Oy thin films on an Al2O3 substrate was about 30 000 at 15 K, which is about 82 times higher than the simulated Qu of a copper counterpart at room temperature. Measurement of the input power dependence of Qu showed that a Qu of over 20 000 was obtained up to 16 dBm. Measurement of the RF magnetic field profile along the z-axis showed that the RF magnetic field was more than 85% uniform around the sample region.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2019.2902802