Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley, M.I.; Kostyurina, E. A.; Kalashnikov, K. V.; Maslennikov, Yu. V.; Koshelets, V. P.; Dunin-Borkowski, Rafal E.

doi:10.3390/s17122798

Cited by 24 publications

(24 citation statements)

References 51 publications

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“…We find good agreement between theoretical estimations and measured values both for V Φ and S 1/2 Φ in contrast to earlier reports [17,18,19,20]. This suggests that equations (4) and (5) can be used to optimize SQUID parameters. Equation (5) predicts that lower noise levels can be achieved with junction technologies offering higher I * c R n at 77 K, such as step edge junctions [50,51,35] or possibly the novel grooved Dayem nanobridges [52].…”

Section: Discussionsupporting

confidence: 46%

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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: Discussionsupporting

confidence: 46%

“…For sample A that would mean narrower junctions with even larger parasitic kinetic inductance contributions. For all our SQUIDs the theoretical intrinsic SQUID noise is dominated by the R dyn -term in equation (5), while the L-term is negligible.…”

Section: Transfer Function and Flux Noise Dependence On Inductancementioning

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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“…The specific layout presented in Figure 1 a is designed for a frequency range of 400–700 GHz; we also developed the designs for the lower ranges of 320–550 GHz [ 27 , 30 ] and of 250–450 GHz [ 30 ]. The technology for the fabrication of high quality Nb-based superconducting circuits in our group is discussed in detail in [ 46 , 47 , 48 ]; this well-developed technology itself is not an area of interest in this paper.…”

Section: Methodsmentioning

confidence: 99%

Terahertz Spectroscopy of Gas Absorption Using the Superconducting Flux-Flow Oscillator as an Active Source and the Superconducting Integrated Receiver

Kinev

Rudakov

Filippenko

et al. 2020

Sensors

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We report on the first implementation of a terahertz (THz) source based on a Josephson flux-flow oscillator (FFO) that radiates to open space. The excellent performance of this source and its maturity for practical applications has been demonstrated by the spectroscopy of gas absorption. To study the radiated power, we used a bolometric detection method and additionally calibrated the power by means of pumping the superconductor–insulator–superconductor (SIS) junction, integrated on a single chip with the FFO. For calibration, we developed a program using the SIS-detected power calculations in accordance with the Tien and Gordon model. The power emitted to open space is estimated to be from fractions of µW to several µW in the wide region from 0.25 THz up to 0.75 THz for different designs, with a maximum power of 3.3 µW at 0.34 THz. Next, we used a gas cell and a heterodyne superconducting integrated receiver to trace the absorption lines of water and ammonia with a spectral resolution better than 100 kHz. Our experiment for gas absorption is the first demonstration of the applicability of the FFO as an external active source for different tasks, such as THz spectroscopy, near-field THz imaging and microscopy.

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“…Broadly, a sample is moved horizontally under a tiny magnetic sensor located very close to the surface of the sample. A magnetic map is then constructed by recording the measurement of the magnetic field at each point of a regular grid of positions [1][2][3][4][5][6][7][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the majority of magnetic microscopes operate at low temperatures, because they use SQUID (Superconducting Quantum Interference Device) sensors and magnetic shielding due to the sensitivity of the reading systems [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Characterizing Complex Mineral Structures in Thin Section of Geological Sample with a Scanning Hall Effect Microscope

Araújo¹,

Reis²,

Oliveia³

et al. 2019

Preprint

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We improved a magnetic scanning microscope for measuring the magnetic properties of minerals in thin sections of geological samples at submillimeter scales. The microscope is comprised of a 200 µm diameter Hall sensor that is 142 µm from the sample; an electromagnet capable of applying to the sample up to 500 mT dc magnetic fields over a 40 mm diameter region; a second Hall sensor arranged in a gradiometric configuration to cancel the background signal applied by the electromagnet and reduce overall noise in the system; a custom-designed electronics to bias the sensors and provide adjustment for background signal cancelation; and a scanning XY stage with micrometer resolution. Our system achieves a spatial resolution of  220 µm with noise at 6.0 Hz of »300 nTrms/(Hz)1/2 in an unshielded environment. The magnetic moment sensitivity is 1.3 × 10−11 Am2.1/2 We successfully measured the representative magnetization of a geological sample using an alternative model that takes into account the sample geometry and identified different micrometric characteristics in the sample slice.

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Superconducting Quantum Interferometers for Nondestructive Evaluation

Cited by 24 publications

References 51 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

Terahertz Spectroscopy of Gas Absorption Using the Superconducting Flux-Flow Oscillator as an Active Source and the Superconducting Integrated Receiver

Characterizing Complex Mineral Structures in Thin Section of Geological Sample with a Scanning Hall Effect Microscope

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