Improved coupling of nanowire-based high-T-c SQUID magnetometers-simulations and experiments

Xie, Minshu, 1988 (author): Chalmers tekniska högskola,Chalmers University of Technology

Chukharkin Leonidovich, Maxim, 1980 (author): Chalmers tekniska högskola,Chalmers University of Technology

Ruffieux, Silvia, 1990 (author): Chalmers tekniska högskola,Chalmers University of Technology

Schneiderman, Justin F., 1979 (author): Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi,Institute of Neuroscience and Physiology

Kalaboukhov, Alexei, 1975 (author): Chalmers tekniska högskola,Chalmers University of Technology

Arzeo, Marco, 1986 (author): Chalmers tekniska högskola,Chalmers University of Technology

Bauch, Thilo, 1972 (author): Chalmers tekniska högskola,Chalmers University of Technology

Lombardi, Floriana, 1967 (author): Chalmers tekniska högskola,Chalmers University of Technology

Winkler, Dag, 1957 (author): Chalmers tekniska högskola,Chalmers University of Technology

Ntor R, Ieee Transactions O. N. Applied Superconductivity Applied (author)

(creator_code:org_t)

2017-10-20
2017
English.
In: Superconductor Science & Technology. - : IOP Publishing. - 0953-2048 .- 1361-6668. ; 30:11

Related links:: http://dx.doi.org/10...; show more...; https://gup.ub.gu.se...; https://doi.org/10.1...; https://research.cha...; show less...

Abstract Subject headings

Superconducting quantum interference devices (SQUIDs) based on high critical-temperature superconducting nanowire junctions were designed, fabricated, and characterized in terms of their potential as magnetometers for magnetoencephalography (MEG). In these devices, the high kinetic inductance of junctions and the thin film thickness (50 nm) pose special challenges in optimizing the field coupling. The high kinetic inductance also brings difficulties in reaching a low SQUID noise. To explore the technique for achieving a high field sensitivity, single-layer devices with a directly connected pickup loop and flip-chip devices with an inductively coupled flux transformer using a two-level coupling approach were fabricated and tested. Two-level coupling is an approach designed for flip-chip nanowire-based SQUIDs, in which a washer type SQUID pickup loop is introduced as an intermediate coupling level between the SQUID loop and the flux transformer input coil. The inductances and effective areas of all these devices were simulated. We found that at T = 77 K, flip-chip devices with the two-level coupling approach (coupling coefficient of 0.37) provided the best effective area of 0.46 mm(2) among all the tested devices. With a flux noise level of 55 mu Phi(0) Hz-1/2, the field sensitivity level was 240 fTHz-1/2. This sensitivity is not yet adequate for MEG applications but it is the best level ever reached for nanowire-based high-Tc SQUID magnetometers.

NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

By the author/editor: Xie, Minshu, 198 ...; Chukharkin Leoni ...; Ruffieux, Silvia ...; Schneiderman, Ju ...; Kalaboukhov, Ale ...; Arzeo, Marco, 19 ...; show more...; Bauch, Thilo, 19 ...; Lombardi, Floria ...; Winkler, Dag, 19 ...; Ntor R, Ieee Tra ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

By the university: University of Gothenburg; Chalmers University of Technology

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