A 5-μm-wide 18-cm-long low-loss YBa/sub 2/Cu/sub 3/O/sub 7-δ/ coplanar line for future multichip module technology

Yoshitake, T.; Tahara, S.

doi:10.1109/77.712140

IEEE Trans. Appl. Supercond.

1998

DOI: 10.1109/77.712140

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A 5-μm-wide 18-cm-long low-loss YBa/sub 2/Cu/sub 3/O/sub 7-δ/ coplanar line for future multichip module technology

T. Yoshitake

S. Tahara

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Cited by 4 publications

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“…We choose a maximal loop area allowed by fabrication technology A = (8 mm) 2 . We anticipate that reaching a significant α k is the main bottleneck: The reported values 16 of the YBCO λ in the low-T limit are only 150 − 200 nm, and few devices have previously featured long superconducting traces with a small cross-section 17 . We select a conservative value of w = 10 µm, and compare devices with a variable d ≤ 225 nm.…”

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Magnetic field sensing with the kinetic inductance of a high-Tc superconductor

et al. 2019

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We carry out an experimental feasibility study of a magnetic field sensor based on the kinetic inductance of the high-T c superconductor yttrium barium copper oxide. We pattern thin superconducting films into radiofrequency resonators that feature a magnetic field pick-up loop. At 77 K and for film thicknesses down to 75 nm, we observe the persistence of screening currents that modulate the loop kinetic inductance. According to the experimental results the device concept appears attractive for sensing applications in ambient magnetic field environments. We report on a device with a magnetic field sensitivity of 4 pT/ √ Hz, an instantaneous dynamic range of 11 µT, and operability in magnetic fields up to 28 µT.The kinetic inductance of superconductors has found many applications in fields as diverse as bolometry 1,2 , parametric amplification 3,4 , current detectors 5 , and sensing of electromagnetic radiation 6,7 , to name but a few. Each device harnesses a certain type of a non-linearity of the kinetic inductance L k , such as that induced by temperature, electric current, or non-equilibrium quasiparticles. In sensor applications, radio-frequency (rf) techniques are often employed in observation of the variations of L k : a high sensitivity follows from the intrinsically low dissipation of the superconductors, manifesting itself as a high quality factor of resonator circuits, for example.The general advantages common to all L k sensors have motivated the development of kinetic inductance magnetometers (KIMs), devices that combine the L k current non-linearity with magnetic flux quantization 8,9 . In comparison to the most established category of sensitive magnetometers, i.e., superconducting quantum interference devices (SQUIDs), KIMs have certain benefits. KIM fabrication involves only a single-layer process that avoids Josephson junctions which are the central components of SQUIDs. Furthermore, KIMs typically have a higher dynamic range, and they enable operation in demanding ambient magnetic field conditions. KIMs also unlock the ability to use frequency multiplexing for the readout of large sensor arrays where each magnetometer has a dedicated eigenfrequency 6,10 .In this Letter, we demonstrate KIMs fabricated from yttrium barium copper oxide (YBCO). YBCO is a high-T c superconductor that enables KIM operability at elevated temperatures T , allowing for cooling with liquid nitrogen. Non-linear L k of YBCO has previously been evaluated for bolometric 2 (direct 7 ) detection of infrared (optical) radiation. A further benefit of the material is its a) visa.vesterinen@vtt.fi high tolerance against background magnetic fields, which has recently culminated in a YBCO rf resonator with a quality factor of about 10 4 at T < 55 K and at a magnetic flux density of 7 T applied parallel to the superconducting film 11 . From a sensitivity viewpoint, an important benchmark for our KIM are state-of-the-art YBCO SQUID magnetometers 12 that have a sensitivity better than 50 fT/ √ Hz. However, these SQUIDs suffer from a compli...

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Magnetic field sensing with the kinetic inductance of a high-Tc superconductor

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Copper composition dependence of the structure and microwave properties in Y-Ba-Cu-O films

Yoshitake

Tahara

1999

IEEE Trans. Appl. Supercond.

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A reentrant delay-line memory using a YBa/sub 2/Cu/sub 3/O/sub 7-δ/ coplanar delay-line

Yoshitake

Tahara

1999

IEEE Trans. Appl. Supercond.

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A 5-μm-wide 18-cm-long low-loss YBa/sub 2/Cu/sub 3/O/sub 7-δ/ coplanar line for future multichip module technology

Cited by 4 publications

References 16 publications

Magnetic field sensing with the kinetic inductance of a high-Tc superconductor

Magnetic field sensing with the kinetic inductance of a high-Tc superconductor

Copper composition dependence of the structure and microwave properties in Y-Ba-Cu-O films

A reentrant delay-line memory using a YBa/sub 2/Cu/sub 3/O/sub 7-δ/ coplanar delay-line

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