Superconducting Quantum Interference Filters Operated in Commercial Miniature Cryocoolers

Oppenlaender, J.; Haeussler, Ch.; Friesch, A.; Tomes, J.; Caputo, P.; Traeuble, T.; Schopohl, N.

doi:10.1109/tasc.2005.850128

Cited by 46 publications

(19 citation statements)

References 6 publications

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“…Both of them are maximum for a given temperature and a given bias current [33,34]. Figure 2 shows the ∆V DC vs B curve corresponding to these optimal values (T = 67.5 K and I = 65 µA) : ∆V DCmax ∼ 2.5 mV and V B ∼ 450 V T −1 are roughly half the values already reported for a 2000 SQUID SQIF made in the same conditions [33,34] as expected, and compare favourably with previous reports for HTS devices [19,25].…”

Section: Resultssupporting

confidence: 88%

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Pawlowski¹,

Kermorvant²,

Crété³

et al. 2018

Supercond. Sci. Technol.

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Superconducting Quantum Interference Filters (SQIF) are promising devices for Radio-Frequency (RF) detection combining low noise, high sensitivity, large dynamic range and wide-band capabilities. Impressive progress have been made recently in the field, with SQIF based antennas and amplifiers showing interesting properties in the GHz range using the well-established Nb/AlOx technology. The possibility to extend these results to High Temperature Superconductors (HTS) is still open, and different techniques to fabricate HTS SQIFs are competing to make RF devices.We report on the DC and RF response of a High Temperature SQIF fabricated by the ion irradiation technique. It is made of 1000 Superconducting QUantum Interference Devices (SQUIDs) in series, with loop areas randomly distributed between 6 µm 2 and 60 µm 2 . The DC transfer factor is ∼ 450 V T −1 at optimal bias and temperature, and the maximum voltage swing ∼ 2.5 mV . We show that such a SQIF detects RF signals up to 150 MHz. It presents linear characteristics for RF power spanning more than five decades, and non-linearities develop beyond P RF = −35 dBm in our set-up configuration. Second-harmonic generation has been shown to be minimum at the functioning point in the whole range of frequencies. A model has been developed which captures the essential features of the SQIF RF response.

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Section: Resultssupporting

confidence: 88%

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Pawlowski¹,

Kermorvant²,

Crété³

et al. 2018

Supercond. Sci. Technol.

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“…Additional noise properties of similar SQIFs in active microcoolers are presented elsewhere [16]. Recently, higher magnetic field resolution has been achieved in SQIFs with a specially sensitive pick-up loop design [18].…”

Section: B the Noise Measurementsmentioning

confidence: 95%

Superconducting Quantum Interference Filters as Absolute Magnetic Field Sensors

Caputo

Tomes

Oppenländer

et al. 2005

IEEE Trans. Appl. Supercond.

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We propose Superconducting Quantum Interference Filters (SQIFs) as high sensitive magnetic field detectors. The SQIF is made of high critical temperature grain boundary Josephson junctions, and it is surrounded by an on chip superconducting pick-up loop which enhances the magnetic field sensitivity of about 10 times with respect to the same SQIF without pick-up loop. The devices are operated in Stirling microcoolers, at a temperature of about 70 K. In the presence of an applied magnetic field , SQIFs show the typical magnetic field dependent voltage response ( ), which is sharp delta-like dip in the vicinity of zero magnetic field. When the SQIF is cooled with magnetic shield, and then the shield is removed, the presence of the ambient magnetic field induces a shift of the dip position from 0 0 to a value 1 , which is about the average value of the Earth magnetic field, at our latitude. The low hysteresis observed in the sequence of experiments makes SQIFs suitable for high precision measurements of the absolute magnetic field. Typical magnetic flux noise spectra of SQIFs show a white noise level of about 0.6 T Hz. Comparative measurements of the direct spectra with the spectra measured by using noise reduction techniques reveal a significant decrease of the 1 noise levels. The experimental results are discussed in view of potential applications of high critical temperature SQIFs in magnetometry.

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“…Extensive efforts have been made to optimize their response for low noise and high sensitivity. In the 1960s, the idea of placing SQUIDs into large arrays to increase sensitivity was proposed [2], and the concept has been demonstrated since to lower noise [3], [4].…”

Section: Introductionmentioning

confidence: 99%

High-Tc Step-Edge Josephson Junction Arrays: Comparison of Simulated and Experimental Voltage Responses

Hannam

Mitchell

Yuan

et al. 2016

IEEE Trans. Appl. Supercond.

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With the recent development of multi-junction Superconducting Quantum Interference Device (SQUID) arrays and Superconducting Quantum Interference Filters (SQIFs) using High Temperature Superconducting (HTS) materials, it has become increasingly desirable to accurately model HTS devices to enable the optimization of the design for enhanced performance before fabrication. Initially, to develop our simulation capability for HTS devices, we have been working with a commercial software package to fit the data obtained from the characterization of two HTS devices. The models were adjusted iteratively by increasing the number of parameters taken into account, including the aspect ratio of the SQUID loop and the bias injection point. These models were developed for devices fabricated using YBCO step-edge junctions formed on MgO substrates. It was found that the biasing mechanism affects the SQIF voltage response to applied magnetic fields. This has implications for the design of larger arrays.

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Superconducting Quantum Interference Filters Operated in Commercial Miniature Cryocoolers

Cited by 46 publications

References 6 publications

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Superconducting Quantum Interference Filters as Absolute Magnetic Field Sensors

High-Tc Step-Edge Josephson Junction Arrays: Comparison of Simulated and Experimental Voltage Responses

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Superconducting Quantum Interference Filters Operated in Commercial Miniature Cryocoolers

Cited by 46 publications

References 6 publications

Static and radio frequency magnetic response of high T c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T c superconducting quantum interference filters made by ion irradiation

Superconducting Quantum Interference Filters as Absolute Magnetic Field Sensors

High-Tc Step-Edge Josephson Junction Arrays: Comparison of Simulated and Experimental Voltage Responses

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Product

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Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation

Static and radio frequency magnetic response of high T _c superconducting quantum interference filters made by ion irradiation