Characteristics of integrated high-Tc superconducting quantum interference device magnetometer and gradiometer with serial array

Liao

IEEE Trans. Appl. Supercond.

et al. 2015

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The fabrication of high-T c YBa 2 Cu 3 O y (YBCO) superconducting quantum interference devices (SQUIDs) that produce low flux noise while maintaining a high fabrication yield continues to challenge scientists. In this paper, we report the characterization of low-noise serial high-T c SQUIDs for biomagnetic applications. Epitaxial high-T c YBCO thin films with a root-mean-square surface roughness less than 5 nm are optimized for the low-noise serial SQUID coupled to a common pickup coil to form magnetometers and gradiometers. Current-voltage curves, voltage-flux curves, and flux noise of SQUID devices are characterized. A smooth surface morphology across the bicrystal line is essential for SQUIDs to show good characteristics. The field sensitivity is improved by a factor of (2) 1/2 with the designed serial SQUID array, which is coupled to a common pickup loop. This is demonstrated, and its fabrication yield is higher than 80% for devices with peak-to-peak voltage V PP ≥ 15 μV. The challenges and perspectives of the high-T c serial SQUID array for biomagnetic applications are addressed and discussed.

Section: Resultsmentioning

confidence: 99%

Section: B Design Of Magnetometers and Gradiometers With Squids In Smentioning

confidence: 99%

Low-Noise Serial High- $T_{c}$ $\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{y}$ Superconducting Quantum Interference Devices Based on Bicrystal Junctions

Liao

IEEE Trans. Appl. Supercond.

et al. 2015

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Supercond. Sci. Technol.

“…There has been significant effort in improving the flux noise of SQUID magnetometers. SQUID magnetometers or gradiometers with high-field sensitivity have already been fabricated [11][12][13][14][15]. These low noise biosensors show promising biomagnetic applications.…”

Section: Squidsmentioning

confidence: 99%

“…Fabricating high-T c SQUIDs with high yield for biomagnetic applications is still challenging work. A proposed design of serial SQUID arrays has significantly improved the fabrication [82] yield. High quality bi-crystal [83], step-edge substrates [84] and high quality YBa 2 Cu 3 O y films are required to achieve high fabrication yields.…”

Section: Challenges and Perspectivementioning

confidence: 99%

Advances in biomagnetic research using high-T_csuperconducting quantum interference devices

Yang

Horng

Yang

et al. 2009

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This review reports the advances of biomagnetic research using high- Tc superconducting quantum interference devices (SQUIDs). It especially focuses on SQUID-detected magnetocardiography (MCG), magnetically labeled immunoassays (MLIs) as well as nuclear magnetic resonance and imaging (NMR/MRI). The progress in MCG that scientists have made and the encountered challenges are discussed here. This study includes the early detection of the electromagnetic change in cardiac activity in animal studies of hypercholesterolemic rabbits, which suggests the possibility of early diagnosis of cardiac disease in clinical applications. The progress on MLIs using measurements of remanence, magnetic relaxation and magnetic susceptibility reduction is presented. The wash-free immunomagnetic reduction shows both high sensitivity and high specificity. NMR/MRI of high spectral resolution and of high signal-to-noise ratio are addressed and discussed. The proton–phosphate J-coupling of trimethyl phosphate ((CH3)3PO4) in one shot in microtesla fields is demonstrated. The prospects of biomagnetic applications are addressed.

The balance and noise properties of directly coupled high-Tc superconducting quantum interference device gradiometers with a serial array

Hong

Applied Physics Letters

et al. 2008

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