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Shane A Cybart - One of the best experts on this subject based on the ideXlab platform.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Hao Li, Stephen J Mccoy, Yanting Wang, Jay Lefebvre, Yuchao W Zhou, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Han Cai, Stephen J Mccoy, Yanting Wang, Yuchao W Zhou, Ethan Y Cho, Jay C Lefebvre, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
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simulation of series arrays of superconducting quantum interference devices
IEEE Transactions on Applied Superconductivity, 2013Co-Authors: S Wu, Shane A Cybart, S M Anton, R C DynesAbstract:The voltage as a function of applied magnetic field (V-B) was calculated for arrays of superconducting quantum interference devices (Squids) connected in series. Comparisons were made between arrays of equal area Squids and superconducting quantum interference filters (SQIFs). The areas for the SQIFs were varied exponentially, so that the V-B had a sharp minimum at zero field. We used equations for the dc Squid based on resistively shunted junctions, with typical parameters for YBa2Cu3O7 - δ ion damage Josephson junctions. The maximum transfer coefficient of the central minimum VB = (∂V/∂B)max of the SQIF decreases as the area range increases. We find that the equal area array is more robust to the effects of non-uniform junction critical currents than the SQIF, for the junction parameters and Squid area distributions chosen. Furthermore, we find that slight variations (~5%) to the area due to fabrication irregularities have little effect on the central minimum of V-B for either device.
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series array of incommensurate superconducting quantum interference devices from yba2cu3o7 δ ion damage josephson junctions
Applied Physics Letters, 2008Co-Authors: Shane A Cybart, John Clarke, S Wu, S M Anton, Irfan Siddiqi, R C DynesAbstract:We have fabricated a series array of 280 superconducting quantum interference devices (Squids) using YBa2Cu3O7−δ thin film ion damage Josephson junctions. The Squid loop areas were tapered exponentially so that the response of the current-biased array to magnetic field is a single voltage spike at zero field. We fitted the current-voltage characteristics of the array to a model in which we summed the voltages across the Squids assuming a resistively shunted junction model with a normal distribution of Squid critical currents. At 75 K the standard deviation of these critical currents was 12%.
D Koelle - One of the best experts on this subject based on the ideXlab platform.
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optimizing the spin sensitivity of grain boundary junction nanoSquids towards detection of small spin systems with single spin resolution
Superconductor Science and Technology, 2014Co-Authors: Roman Wolbing, R Kleiner, Tobias Schwarz, B Muller, J Nagel, M Kemmler, D KoelleAbstract:We present an optimization study of the spin sensitivity of nano superconducting quantum interference devices (Squids) based on resistively shunted grain boundary Josephson junctions. In addition the direct current Squids contain a narrow constriction onto which a small magnetic particle can be placed (with its magnetic moment in the plane of the Squid loop and perpendicular to the grain boundary) for efficient coupling of its stray magnetic field to the Squid loop. The separation of the location of optimum coupling from the junctions allows for an independent optimization of the coupling factor and junction properties. We present different methods for calculating (for a magnetic nanoparticle placed 10 nm above the constriction) as a function of device geometry and show that those yield consistent results. Furthermore, by numerical simulations we obtain a general expression for the dependence of the Squid inductance on geometrical parameters of our devices, which allows to estimate their impact on the spectral density of flux noise of the Squids in the thermal white noise regime. Our analysis of the dependence of and on the geometric parameters of the Squid layout yields a spin sensitivity of a few ( is the Bohr magneton) for optimized parameters, respecting technological constraints. However, by comparison with experimentally realized devices we find significantly larger values for the measured white flux noise, as compared to our theoretical predictions. Still, a spin sensitivity on the order of for optimized devices seems to be realistic.
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optimizing the spin sensitivity of grain boundary junction nanoSquids towards detection of small spin systems with single spin resolution
arXiv: Superconductivity, 2014Co-Authors: Roman Wolbing, R Kleiner, Tobias Schwarz, B Muller, J Nagel, M Kemmler, D KoelleAbstract:We present an optimization study of the spin sensitivity of nanoSquids based on resistively shunted grain boundary Josephson junctions. In addition the dc Squids contain a narrow constriction onto which a small magnetic particle can be placed (with its magnetic moment in the plane of the Squid loop and perpendicular to the grain boundary) for efficient coupling of its stray magnetic field to the Squid loop. The separation of the location of optimum coupling from the junctions allows for an independent optimization of the coupling factor $\phi_\mu$ and junction properties. We present different methods for calculating $\phi_\mu$ (for a magnetic nanoparticle placed 10\,nm above the constriction) as a function of device geometry and show that those yield consistent results. Furthermore, by numerical simulations we obtain a general expression for the dependence of the Squid inductance on geometrical parameters of our devices, which allows to estimate their impact on the spectral density of flux noise $S_\Phi$ of the Squids in the thermal white noise regime. Our analysis of the dependence of $S_\Phi$ and $\phi_\mu$ on the geometric parameters of the Squid layout yields a spin sensitivity $S_\mu^{1/2}=S_\Phi^{1/2}/\phi_\mu$ of a few $\mu_{\rm{B}}/\rm{Hz^{1/2}}$ ($\mu_B$ is the Bohr magneton) for optimized parameters, respecting technological constraints. However, by comparison with experimentally realized devices we find significantly larger values for the measured white flux noise, as compared to our theoretical predictions. Still, a spin sensitivity on the order of $10\,\mu_{\rm B}/\rm{Hz^{1/2}}$ for optimized devices seems to be realistic.
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superconducting quantum interference devices state of the art and applications
Proceedings of the IEEE, 2004Co-Authors: R Kleiner, D Koelle, F Ludwig, John ClarkeAbstract:Superconducting quantum interference devices (Squids) are sensitive detectors of magnetic flux. A Squid consists of a superconducting loop interrupted by either one or two Josephson junctions for the RF or dc Squid, respectively. Low transition temperature (T/sub c/) Squids are fabricated from thin films of niobium. Immersed in liquid helium at 4.2 K, their flux noise is typically 10/sup -6//spl Phi//sub 0/ Hz/sup -1/2/, where /spl Phi//sub 0//spl equiv/h/2e is the flux quantum. High-T/sub c/ Squids are fabricated from thin films of YBa/sub 2/Cu/sub 3/O/sub 7-x/, and are generally operated in liquid nitrogen at 77 K. Inductively coupled to an appropriate input circuit, Squids measure a variety of physical quantities, including magnetic field, magnetic field gradient, voltage, and magnetic susceptibility. Systems are available for detecting magnetic signals from the brain, measuring the magnetic susceptibility of materials and geophysical core samples, magnetocardiography and nondestructive evaluation. Squid "microscopes" detect magnetic nanoparticles attached to pathogens in an immunoassay technique and locate faults in semiconductor packages. A Squid amplifier with an integrated resonant microstrip is within a factor of two of the quantum limit at 0.5 GHz and will be used in a search for axions. High-resolution magnetic resonance images are obtained at frequencies of a few kilohertz with a Squid-based detector.
Yuchao W Zhou - One of the best experts on this subject based on the ideXlab platform.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Hao Li, Stephen J Mccoy, Yanting Wang, Jay Lefebvre, Yuchao W Zhou, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Han Cai, Stephen J Mccoy, Yanting Wang, Yuchao W Zhou, Ethan Y Cho, Jay C Lefebvre, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
Yanting Wang - One of the best experts on this subject based on the ideXlab platform.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Hao Li, Stephen J Mccoy, Yanting Wang, Jay Lefebvre, Yuchao W Zhou, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Han Cai, Stephen J Mccoy, Yanting Wang, Yuchao W Zhou, Ethan Y Cho, Jay C Lefebvre, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
Stephen J Mccoy - One of the best experts on this subject based on the ideXlab platform.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Hao Li, Stephen J Mccoy, Yanting Wang, Jay Lefebvre, Yuchao W Zhou, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
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high transition temperature nanoscale superconducting quantum interference devices directly written with a focused helium ion beam
Applied Physics Letters, 2020Co-Authors: Han Cai, Stephen J Mccoy, Yanting Wang, Yuchao W Zhou, Ethan Y Cho, Jay C Lefebvre, Shane A CybartAbstract:In this work, we present nanoscale superconducting quantum interference devices (Squids) with dimensions as small as 10 nm from the high-transition-temperature superconductor YBa2Cu3 O 7 − δ (YBCO). The Squid features and Josephson junctions are directly written into a 35-nm thick YBCO film with a focused helium ion beam. We integrate these nano-Squids with directly written nano-isolated inductively coupled control lines to demonstrate a low power superconducting output driver capable of transimpedance conversion over a very wide temperature range of 4–50 K.
