In this work, we demonstrate the ability to fabricate superconducting quantum interference devices (SQUIDs) by directly writing Josephson junctions into plane of YBa2Cu3O7−δ thin films with a focused helium ion beam. This technique allows for control barrier transport properties through single parameter, dose. SQUIDs written dose 4 × 1016 ions/cm2 had metallic that exhibited nearly ideal electrical characteristics at 50 K and flux noise 20 μΦ0/Hz 10 Hz. At higher irradiation doses,...

We report the fabrication of nanoscale wires and Josephson junctions in 25 nm thick YBa2Cu3O7–δ thin films with wire widths as narrow 50 nm. Our approach utilizes a finely focused gas field ion source from helium microscope to directly modify material on nanometer scale convert irradiated regions film into insulators. In this manner, remains intact no is milled or removed. Transport data show that electrical properties, critical current conductance, linearly lithographically defined width...

Direct write patterning of high-transition temperature (high-TC) superconducting oxide thin films with a focused helium ion beam is formidable approach for the scaling high-TC circuit feature sizes down to nanoscale. In this letter, we report using technique create sensitive micro quantum interference device (SQUID) magnetometer sensing area about 100 × μm2. The fabricated from single 35-nm thick YBa2Cu3O7-δ film. A flux concentrating pick-up loop directly coupled 10 nm 20 μm nano-slit...

We have fabricated and tested two-dimensional arrays of YBa2Cu3O7−δ superconducting quantum interference devices. The contain over 36 000 nano Josephson junctions from ion irradiation through narrow slits in a resist-mask that was patterned with electron beam lithography reactive etching. Measurements current-biased magnetic field exhibit large voltage modulations as high 30 mV.

We report the fabrication and measurement of quantum flux parametron logic from high-transition-temperature Josephson junctions operating at 25 K, above temperature liquid helium. The circuits are written directly into plane a single-layer thin film YBa2Cu3O7 using focused helium ion beam. A single-cell was constructed correct operation verified by an on-chip superconducting interference device for readout. three-cell shift register also fabricated tested three-phase clock cycle. estimate...

Irradiation of high-temperature superconductor YBa2Cu3O7 (YBCO) with high-energy He+ ions is known to cause structural changes in the YBCO film, decreasing critical temperature TC and finally leading a superconductor-to-insulator transition. This allows one pattern narrow insulating regions focused ion beam (FIB) thus fabricate nanoscale Josephson junctions on films. Moreover, such irradiation film. However, details how these occur devices produced by FIB remain unknown. Using nanofocus...

In this work, we present nanoscale superconducting quantum interference devices (SQUIDs) with dimensions as small 10 nm from the high-transition-temperature superconductor YBa2Cu3O7−δ (YBCO). The SQUID features and Josephson junctions are directly written into a 35-nm thick YBCO film focused helium ion beam. We integrate these nano-SQUIDs nano-isolated inductively coupled control lines to demonstrate low power output driver capable of transimpedance conversion over very wide temperature range 4–50 K.

We report the fabrication and testing of arrays nanoscale superconducting quantum interference devices (SQUIDs) directly written into a thin film high-transition temperature superconductor YBa2Cu-3O7−δ with focused helium ion beam. compare three array configurations 400 nm by nanoSQUIDs connected in series parallel two-dimensional (2D) combination both. Our electrical transport measurements show that exhibit modulation voltages greater than 1 mV combining greatly enhances slope...

We investigate the temporal stability of YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> Josephson junctions created by ion irradiation through a nanoscale implant mask fabricated using electron beam lithography and reactive etching. A comparison current-voltage characteristics measured for after fabrication eight years...

Focused helium ion beam material modification is ideally suited for the fabrication of YBa2Cu3O7-δ (YBCO) Josephson junctions and superconducting feature sizes down to nanoscale. We report measurement YBCO nano-slit SQUIDs study how scaling dimensions SQUID body electrodes influences electrical properties. Sixteen with different width length were fabricated from a single-layer 25-nm-thick film. The experimental results yield an estimation sheet inductance be ~4 pH/□ penetration depth ~180...

We investigated series arrays of closely spaced, planar long Josephson junctions for magnetic field transduction in Earth’s field, with a linear response and high dynamic range. The devices were fabricated from thin film high-temperature superconductor YBa2Cu3O7−δ (YBCO) films, using focused helium ion beam irradiation to create the barriers. Four arrays, each consisting several hundreds junctions, electrically tested. From fits current-voltage characteristics, we estimate standard deviation...

Series arrays of closely spaced, planar long Josephson junctions were demonstrated to be transducers magnetic flux featuring high-dynamic range, wide-bandwidth, and the capability operate at cryogenic nitrogen temperatures. By tuning scaling geometry these devices, it is possible improve their sensitivity an applied field generate higher voltage responses. Moreover, devices feature linear responses allowing for potential unlocked operation. Herein, we study focusing effect in series...

We have irradiated high-quality YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> thin films with 90-keV helium and 175-keV neon ions to compare how of different mass affect electrical transport reduce superconducting transition temperature. measure the temperature dependence resistivity for fluence results Monte Carlo ion...

Superconducting tunnel spectroscopy has been used for decades to gather valuable information about the electronic density of states and energy gap in superconductors. For thin film materials, this has, most part, only possible directions perpendicular substrate. anisotropic materials like cuprate superconductors, hindered knowledge a–b plane where superconductivity is strongest. The advent helium ion beam fabricated planar Josephson junctions fundamentally changed how we can perform...

Superconducting logic circuits based on low transition temperature (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> ) are attractive due to their intrinsic power consumption and high operating frequency. They have a wide variety of applications (particularly in future computing), but difficult use because they require cooling with liquid helium operate. The current T circuit YBa xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu...

Magnetic field sensors based on two-dimensional arrays of superconducting quantum interference devices were constructed from magnesium diboride thin films. Each array contained over 30 000 Josephson junctions fabricated by ion damage nm weak links through an implant mask defined nano-lithography. Current-biased exhibited very large voltage modulation as a function magnetic field, with amplitudes high 8 mV.

In this article, we present a miniature solid nitrogen cooling system designed for high-transition temperature (high-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> ) superconductor Josephson devices operating in the range of 40-55 K. The utilizes small fiberglass Dewar and an external pump to solidify thermal contact with circuit board insert. Our tests two different Dewars 100 mL 200 capacity reveal that systems can hold at their...

We experimentally measured and compared the sheet inductance of YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO) films with without superconducting ground planes. Specifically, we fabricated several quantum interference devices from single multilayer different geometries using a focused helium ion beam. Measurements...

In this work, we investigate two-dimensional arrays of High-TC superconducting quantum interference devices (SQUIDs) for optimization their electrical transport characteristics. Specifically, look at with different electrode configurations in between the series segments to gain insight into how array spacing, direction bias current, affects voltage magnetic field Our results suggest that spacing dimensions greater than penetration depth interactions are minimal. Furthermore, comparisons...

High-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> superconductor thin film heterostructures were deposited using reactive co-evaporation for dual layer electronic applications. The epitaxial structure consisted of 35-nm YBa xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-δ</sub> (YBCO), 75-nm CeO , 150-nm YBCO, and 20-nm on...

Superconducting quantum interference device (SQUID) based sensors hold promise for magnetic detection of magnetically tagged biological cells. In this work, a high transition temperature (high-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> ) direct-coupled SQUID micro-magnetometer was fabricated from 30-nm-thick YBa xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O...

We report the fabrication and measurement of an ab-plane Josephson junction created in 80-nm thick thin-film-like exfoliated Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sr CaCu O xmlns:xlink="http://www.w3.org/1999/xlink">8+x</sub> $ single crystal flake. The junctions are formed using ion irradiation from a focused helium beam which locally converts material superconductor to insulator. Current-voltage characteristics show device...

We present Josephson junctions fabricated from high transition temperature superconductor YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> coupled to spiral THz antennas. The fabrication process involves creating a junction at the center of superconducting bridge embedded into antenna using irradiation focused helium ion beam....

Josephson junctions fabricated with a focused helium ion beam exhibit electrical properties that are strongly dependent on the size of junction. The length junction, in direction super-current, is one critical parameters. In this report, we compare three methods estimating feature, utilizing resistive and capacitive transport data Monte Carlo implantation simulations. Our results find barrier 3 ± 1 nm long agree well another.