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2011•IEEE Transactions on Applied SuperconductivityRequires access

Step-Edge High-${\rm T}_{\rm c}$ SQUID Magnetometer for Low-Field NMR Detection

Shieh‐Yueh Yang, K W Lin, Jen-Jie Chieh, C. C. Yang, H. E. Horng, Shu Liao, H. H. Chen, Chao Hong, H. C. Yang

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Abstract

The fabrication processes for step-edge high- Tcsuperconducting-quantum-interference-device (SQUID) magnetometers have been developed. A magnetometer consists of three SQUIDs, which can be activated either individually or in series. Thus, the transfer function can be manipulated by activating a single SQUID or multiple SQUIDs in series. Furthermore, such a SQUID magnetometer is benefited by that if one of the three SQUIDs is broken, the other two SQUIDs are still workable. In addition to characterizing the SQUID magnetometer, the application of the SQUID magnetometer in the low-field nuclear magnetic resonance (NMR) has also been investigated. The results has shown a clear NMR signal of 4230 Hz for the water under 99.3 μT.

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What this paper is about

The fabrication processes for step-edge high- Tcsuperconducting-quantum-interference-device (SQUID) magnetometers have been developed. A magnetometer consists of three SQUIDs, which can be activated either individually or in series. Thus, the transfer function can be manipulated by activating a single SQUID or multiple SQUIDs in series. Furthermore, such a SQUID magnetometer is benefited by that if one of the three SQUIDs is broken, the other two SQUIDs are still workable. In addition to characterizing the SQUID magnetometer, the application of the SQUID magnetometer in the low-field nuclear magnetic resonance (NMR) has also been investigated. The results has shown a clear NMR signal of 4230 Hz for the water under 99.3 μT.

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Available abstract

The fabrication processes for step-edge high- Tcsuperconducting-quantum-interference-device (SQUID) magnetometers have been developed. A magnetometer consists of three SQUIDs, which can be activated either individually or in series. Thus, the transfer function can be manipulated by activating a single SQUID or multiple SQUIDs in series. Furthermore, such a SQUID magnetometer is benefited by that if one of the three SQUIDs is broken, the other two SQUIDs are still workable. In addition to characterizing the SQUID magnetometer, the application of the SQUID magnetometer in the low-field nuclear magnetic resonance (NMR) has also been investigated. The results has shown a clear NMR signal of 4230 Hz for the water under 99.3 μT.

Key concepts: Magnetometer, Squid, Superconductivity, Nuclear magnetic resonance, Physics, Scanning SQUID microscopy, Magnetic field, Condensed matter physics

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