Extraction of inductances of plane thin film superconducting circuits

Khapaev, M. M.

doi:10.1088/0953-2048/10/6/002

Cited by 29 publications

(19 citation statements)

References 9 publications

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“…We pick λ p = 800 nm for the simulation based on the common values λ = 400 nm and t = 200 nm. As the kinetic inductance is proportional to λ p , while the geometric inductance is independent of λ p [39], the real inductances can be calculated from the simulated values once λ p is determined.…”

Section: Inductance Simulationmentioning

confidence: 99%

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

Ruffieux

Kalaboukhov

Xie

et al. 2020

Supercond. Sci. Technol.

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Inductance is a key parameter when optimizing the performance of superconducting quantum interference device (SQUID) magnetometers made from the high temperature superconductor YBa 2 Cu 3 O 7−x (YBCO) because lower SQUID inductance L leads to lower flux noise, but also weaker coupling to the pickup loop. In order to optimize the SQUID design, we combine inductance simulations and measurements to extract the different inductance contributions, and measure the dependence of the transfer function V Φ and flux noise SA comparison between two samples shows that the kinetic inductance contribution varies strongly with film quality, hence making inductance measurements a crucial part of the SQUID characterisation. Thanks to the improved estimation of the kinetic inductance contribution, previously found discrepancies between theoretical estimates and measured values of V Φ and S 1/2 Φ could to a large extent be avoided. We then use the measurements and improved theoretical estimations to optimize the SQUID geometry and reach a noise level of S 1/2 B = 44 fT/ √ Hz for the best SQUID magnetometer with a 8.6 mm × 9.2 mm directly coupled pickup loop. Lastly, we demonstrate a method for reliable one-time sensor calibration that is constant in a temperature range of several kelvin despite the presence of temperature dependent coupling contributions, such as the kinetic inductance. The found variability of the kinetic inductance contribution has implications not only for the design of YBCO SQUID magnetometers, but for all narrow linewidth SQUID-based devices operated close to their critical temperature.

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Section: Inductance Simulationmentioning

confidence: 99%

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

Ruffieux

Kalaboukhov

Xie

et al. 2020

Supercond. Sci. Technol.

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“…and Maxwell equations 21 in the presence of an externally applied magnetic field B a . The current distributions inside the SQUID structure were calculated assuming the pick-up loop in the zero flux state (zero vorticity) and, without loss of generality, zero circulating current in the small SQUID loop.…”

Section: (B))mentioning

confidence: 99%

Toward ultra high magnetic field sensitivity YBa2Cu3O7−δ nanowire based superconducting quantum interference devices

Arzeo

Arpaia

Baghdadi

et al. 2016

Journal of Applied Physics

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We report on measurements of YBa 2 Cu 3 O 7Àd nanowire based Superconducting QUantum Interference Devices (nanoSQUIDs) directly coupled to an in-plane pickup loop. The pickup loop, which is coupled predominantly via kinetic inductance to the SQUID loop, allows for a significant increase of the effective area of our devices. Its role is systematically investigated and the increase in the effective area is successfully compared with numerical simulations. Large effective areas, together with the ultra low white flux noise below 1 lU 0 = ffiffiffiffiffiffi Hz p , make our nanoSQUIDs very attractive as magnetic field sensors. Published by AIP Publishing.

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“…The hole-inductance L of the SQUID loop is estimated to be ∼17 pH. 23 The screening parameter β L = 2LI 0 / 0 with a value of ∼0.9 is designed to fit the low flux noise requirement. 24 A representative bias current-to-output voltage characteristic of our SQUID chip is shown in Fig.…”

Section: Squid Chip Characteristicsmentioning

confidence: 99%

An interchangeable scanning Hall probe/scanning SQUID microscope

Tang

Lin

et al. 2014

Review of Scientific Instruments

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We have constructed a scanning probe microscope for magnetic imaging, which can function as a scanning Hall probe microscope (SHPM) and as a scanning SQUID microscope (SSM). The scanning scheme, applicable to SHPM and SSM, consists of a mechanical positioning (sub) micron-XY stage and a flexible direct contact to the sample without a feedback control system for the Z-axis. With the interchangeable capability of operating two distinct scanning modes, our microscope can incorporate the advantageous functionalities of the SHPM and SSM with large scan range up to millimeter, high spatial resolution (⩽4 μm), and high field sensitivity in a wide range of temperature (4.2 K-300 K) and magnetic field (10(-7) T-1 T). To demonstrate the capabilities of the system, we present magnetic images scanned with SHPM and SSM, including a RbFeB magnet and a nickel grid pattern at room temperature, surface magnetic domain structures of a La(2/3)Ca(1/3)MnO3 thin film at 77 K, and superconducting vortices in a striped niobium film at 4.2 K.

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Extraction of inductances of plane thin film superconducting circuits

Cited by 29 publications

References 9 publications

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

The role of kinetic inductance on the performance of YBCO SQUID magnetometers

Toward ultra high magnetic field sensitivity YBa2Cu3O7−δ nanowire based superconducting quantum interference devices

An interchangeable scanning Hall probe/scanning SQUID microscope

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