Monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers

Hilgenkamp, J.W.M.; Brons, G.C.S.; Hoogeveen, S.; Flokstra, Jakob; Rogalla, Horst

doi:10.1109/77.403054

Cited by 5 publications

(8 citation statements)

References 12 publications

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“…The coupling SQUID inductance L c results from a combination of the slit inductance [15,16] and kinetic inductance [17], where the kinetic inductance is a function of the London penetration depth. L slit has been evaluated by making use of…”

Section: Resultsmentioning

confidence: 99%

MgB₂magnetometer with a directly coupled pick-up loop

Portesi

Mijatovic

Veldhuis

et al. 2006

Supercond. Sci. Technol.

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In this work, we show the results obtained in the fabrication and characterization of an MgB 2 magnetometer with a directly coupled pick-up loop. We used an all in situ technique for fabricating magnesium diboride films, which consists of the co-evaporation of B and Mg by means of an e-gun and a resistive heater respectively. Consequently, we realized the superconducting device, which incorporates two nanobridges as weak links in a superconducting loop. The nanobridges were realized by focused ion beam milling; they were 240 nm wide and had a critical current density of 10 7 A cm −2 . The magnetometer was characterized at different temperatures and also measurements of the noise levels have been performed. The device shows Josephson quantum interference up to 20 K and the calculated effective area at low temperatures was 0.24 mm 2 . The transport properties of the magnetometer allow determining fundamental materials properties of the MgB 2 thin films, such as the penetration depth.

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Section: Resultsmentioning

confidence: 99%

MgB₂magnetometer with a directly coupled pick-up loop

Portesi

Mijatovic

Veldhuis

et al. 2006

Supercond. Sci. Technol.

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“…Parameters are given in table 1 and the design of the inductively shunted SQUID is further clarified in figure 1. All SQUIDs were fabricated on 25 • SrTiO 3 bicrystals and were described in detail elsewhere [2][3][4].…”

Section: Squidsmentioning

confidence: 99%

“…In configuration 2 the sensing area of the SQUID is improved by shunting the SQUID with a large pick-up loop having an effective area Ãp and an inductance L p . Then we may write [2,6]…”

Section: Effective Sensing Areamentioning

confidence: 99%

“…Because of the large pick-up loop, its area Ãp and inductance L p are much less affected by temperature fluctuations than the coupling inductance L c . The latter inductance contains a geometrical and a kinetic part [2]: L c = L cg +L ck . L cg can be expressed as L cg = µ 0 l s K(k)/K (k), in which l s is the length of that part of the slit around which the coupling current flows and k = s/(s +2w), with s the slit width and w the width of the superconducting strips (w varies for the different elements of which L c consists) [7].…”

Section: Effective Sensing Areamentioning

confidence: 99%

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Temperature dependence of the effective sensing area of high- dc SQUIDs

Brake

Aarnink

Bosch

et al. 1997

Supercond. Sci. Technol.

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The effective sensing area of a high-T c dc SQUID depends on temperature. As a consequence, fluctuations in the operating temperature result in apparent magnetic field noise if the SQUID is placed in a background magnetic field. An analysis of this effect for two SQUID types, the square-washer 'Ketchen' type and the inductively shunted type, is performed. For magnetocardiography, the temperature fluctuations (peak to peak) of the latter SQUID type should be below 0.3 mK at 77 K, and below 2 mK at 55 K, with an earth's field suppression of 40 dB. For the square-washer SQUID the requirements are about 8 times less stringent.

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“…In the magnetometer single-layer inductively shunted SQUIDs based on 24 • bicrystal grain boundary junctions are used [9]. Each SQUID is shunted by a large-area loop obtaining a low inductance combined with a large effective area.…”

Section: High-t C Squidsmentioning

confidence: 99%

A seven-channel high- SQUID-based heart scanner

Brake

Karunanithi

Holland

et al. 1997

Meas. Sci. Technol.

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We have fabricated a seven-channel magnetometer, equipped with packaged high- SQUIDs. These inductively shunted SQUIDs have a noise level of typically 120 fT down to 1 Hz. A packaging method has been developed and proved to be reliable over a one-year period with at least 25 thermal cycles. The performance of the system was demonstrated by the wide-band recording of seven-channel magnetocardiograms inside a magnetically shielded room.

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Monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers

Cited by 5 publications

References 12 publications

MgB₂magnetometer with a directly coupled pick-up loop

MgB₂magnetometer with a directly coupled pick-up loop

Temperature dependence of the effective sensing area of high- dc SQUIDs

A seven-channel high- SQUID-based heart scanner

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Monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers

Cited by 5 publications

References 12 publications

MgB2magnetometer with a directly coupled pick-up loop

MgB2magnetometer with a directly coupled pick-up loop

Temperature dependence of the effective sensing area of high- dc SQUIDs

A seven-channel high- SQUID-based heart scanner

Contact Info

Product

Resources

About

MgB₂magnetometer with a directly coupled pick-up loop

MgB₂magnetometer with a directly coupled pick-up loop