Epitaxial Oxide Heterostructures for Ultimate High-Tc Quantum Interferometers

Faley, M.I.

doi:10.5772/16302

Cited by 5 publications

(5 citation statements)

References 72 publications

(77 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A direct current SQUID (DC SQUID) is essentially a loop of superconductor interrupted by two Josephson junctions (JJs) that have non-hysteretic current-voltage characteristics and, in an ideal case, identical critical currents I c and normal state resistances R n (see [1,11,12] and references therein). The operation of SQUIDs is based on the dependence of the phase shift of the wave-function of Cooper pairs on the magnetic flux passing through the SQUID loop, similar to the phase shift of the wave-function of a charged particle in the Aharonov-Bohm effect.…”

Section: Basic Principle Of Operation and Important Features Of Sqmentioning

confidence: 99%

Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley

Kostyurina

Kalashnikov

et al. 2017

Sensors

View full text Add to dashboard Cite

We review stationary and mobile systems that are used for the nondestructive evaluation of room temperature objects and are based on superconducting quantum interference devices (SQUIDs). The systems are optimized for samples whose dimensions are between 10 micrometers and several meters. Stray magnetic fields from small samples (10 µm–10 cm) are studied using a SQUID microscope equipped with a magnetic flux antenna, which is fed through the walls of liquid nitrogen cryostat and a hole in the SQUID’s pick-up loop and returned sidewards from the SQUID back to the sample. The SQUID microscope does not disturb the magnetization of the sample during image recording due to the decoupling of the magnetic flux antenna from the modulation and feedback coil. For larger samples, we use a hand-held mobile liquid nitrogen minicryostat with a first order planar gradiometric SQUID sensor. Low-Tc DC SQUID systems that are designed for NDE measurements of bio-objects are able to operate with sufficient resolution in a magnetically unshielded environment. High-Tc DC SQUID magnetometers that are operated in a magnetic shield demonstrate a magnetic field resolution of ~4 fT/√Hz at 77 K. This sensitivity is improved to ~2 fT/√Hz at 77 K by using a soft magnetic flux antenna.

show abstract

Section: Basic Principle Of Operation and Important Features Of Sqmentioning

confidence: 99%

Superconducting Quantum Interferometers for Nondestructive Evaluation

Faley

Kostyurina

Kalashnikov

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…7). This simulation qualitatively shows that superconducting rings practically eliminate fluctuating magnetic fields in the gap (4). Due to high permeability of ferromagnet (10000) the major part of the magnetic flux through superconducting ring is concentrated inside the ferromagnetic yoke.…”

Section: Electron Microscopymentioning

confidence: 71%

“…Due to high permeability of ferromagnet (10000) the major part of the magnetic flux through superconducting ring is concentrated inside the ferromagnetic yoke. Induced superconducting currents keep magnetic flux penetrating through the rings constant and this eliminates fluctuations in the gap (4). A ʺproof-of-principleʺ demonstration of the proposed approach was achieved by using the experimental setup shown in the form of a schematic diagram and a photograph in Figures 8a and 8b, respectively.…”

Section: Electron Microscopymentioning

confidence: 99%

“…[20]. Apart from the coils (not shown) providing the main magnetic flux through the yoke (1), two additional coils (2) can be used together with a SQUID detector (3) in feedback mode for fine adjustment of the magnetic lens field near the sample (4). Two stabilizing SC rings (5) with local resistive heaters (6) are placed near the pole piece ends.…”

Section: Electron Microscopymentioning

confidence: 99%

“…Low noise high-T c superconducting quantum interference devices (SQUIDs) are made from high quality epitaxial YBCO films and grain boundary Josephson junctions. With a help of a 16-mm multilayer superconducting flux transformer the best magnetic field resolution of high-T c SQUIDs about 4 fT/√Hz at 77 K was achieved [3]: all-oxide heterostructures based on highquality epitaxial YBCO thin films with other metal-oxide layers are indispensable for construction of high-T c SQUIDs with ultimate sensitivity [4]. High-T c SQUIDs serve as sensors of magnetic field in the LANDTEM geophysical survey system that has located mineral deposits worth Australian $6bn [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations