Recent Developments of High-Tc Electronic Devices with Multilayer Structures and Ramp-Edge Josephson Junctions

Adachi, Seiji; Tsukamoto, Akira; Hato, Tsunehiro; Kawano, J.; Tanabe, K.

doi:10.1587/transele.e95.c.337

Cited by 12 publications

(6 citation statements)

References 45 publications

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“…Therefore, at least one of them must be slightly dislocated from the ideal symmetric position. Figure 3 shows the structure of our HTS-SQUID magnetometer module [8].…”

Section: Configuration Of Squids In Vector Magnetometermentioning

confidence: 99%

HTS-SQUID vector magnetometer with low crosstalk configuration

et al. 2019

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We propose an HTS-SQUID vector magnetometer with a new configuration reducing the crosstalk between a pickup coil of one SQUID and feedback coils of other SQUIDs. The new configuration is designed to mount three SQUIDs at symmetric positions where the crosstalk should be ideally zero while keeping minimal height of a probe head. In an actual HTS-SQUID magnetometer, however, either pickup coil or feedback coil is inevitably dislocated from the ideal symmetric positions. Numerical simulation of crosstalk revealed that the new configuration has smaller crosstalk than that of a conventional cubic configuration even if the positioning error from the ideal symmetric positions is as small as 1 mm. Three types of SQUID vector magnetometer were fabricated and their crosstalk was measured. The averaged crosstalk of a SQUID vector magnetometer using the new configuration was actually improved by about one order of magnitude as compared with the conventional cubic configuration.

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“…Therefore, at least one of them must be slightly dislocated from the ideal symmetric position. Figure 3 shows the structure of our HTS-SQUID magnetometer module [8].…”

Section: Configuration Of Squids In Vector Magnetometermentioning

confidence: 99%

HTS-SQUID vector magnetometer with low crosstalk configuration

et al. 2019

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“…Using them in a flux-locked loop [2] adds the advantage of a large dynamic range. Moreover, developments in noise reduction techniques have become standard practice [3][4][5], reaching noise levels of approximately 0.1 fT/ √ Hz for low-criticaltemperature (LTc) SQUIDs [6,7] and less than 10 fT/ √ Hz for high-critical-temperature (HTc) SQUIDs [8][9][10][11][12], depending on the probing loop size [13,14]. These techniques can be used for applications that do not require bandwidth in excess of a few MHz (or 150 MHz when only the flux-locked loop technique is used).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Self-Field Effects in Magnetometers Based on Meander-Shaped Arrays of Josephson Junctions or SQUIDs Connected in Series

Crété

Kermorvant²,

Lemaı̂tre

et al. 2021

Micromachines

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Arrays of superconducting quantum interference devices (SQUIDs) are highly sensitive magnetometers that can operate without a flux-locked loop, as opposed to single SQUID magnetometers. They have no source of ambiguity and benefit from a larger bandwidth. They can be used to measure absolute magnetic fields with a dynamic range scaling as the number of SQUIDs they contain. A very common arrangement for a series array of SQUIDs is with meanders as it uses the substrate area efficiently. As for most layouts with long arrays, this layout breaks the symmetry required for the elimination of adverse self-field effects. We investigate the scaling behavior of series arrays of SQUIDs, taking into account the self-field generated by the bias current flowing along the meander. We propose a design for the partial compensation of this self-field. In addition, we provide a comparison with the case of series arrays of long Josephson junctions, using the Fraunhofer pattern for applications in magnetometry. We find that compensation is required for arrays of the larger size and that, depending on the technology, arrays of long Josephson junctions may have better performance than arrays of SQUIDs.

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“…11,12) Recent years, we have fabricated dc SQUID magnetometers and gradiometers containing ramp-edge-type JJs and succeeded in demonstrating actual application systems using liquid nitrogen as a coolant. [13][14][15][16][17][18][19] In order to stabilize the operation, larger magnetic modulation depth ΔV without sacrificing efficiency in coupling between a pickup coil and the inductor is desired. The fabrication technique of JJs exhibiting larger I c R n products reproducibly seems essential to obtain large ΔV.…”

Section: Introductionmentioning

confidence: 99%