Preparation of multilayer films for integrated high-Tc SQUIDs with ramp-edge Josephson junctions

Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-Tc SQUID magnetometer

“…Both types of coils were constructed by connecting two identical elliptical coils in a series opposing configuration. A ramp-edge-type Josephson junction was fabricated on an MgO substrate by a multilayer fabrication technique [20]. The sensitivity of the magnetic susceptibility of the developed system was 1 Â 10 À 8 emu (dimensionless).…”

Improved reproducible fabrication process of HTS-SQUIDs with ramp-edge Josephson junctions and multilayer structures

“…[12]. Materials and the sequence of multilayer structure were the 0921-4534/$ -see front matter Ó 2010 Elsevier B.V. All rights reserved.…”

“…Recent years, we have studied the fabrication process for HTSSQUIDs containing ramp-edge JJs and multilayer structures [12,13] and developed an NDE system for striated YBCO coated conductors [14]. We successfully prepared 5-channel gradiometer arrays exhibiting moderate properties for the system.…”

Robot-arm-based NDE of hydrogen fuel tank using a 3D-movable HTS-SQUID gradiometer

“…al. have developed novel HTS-dc-SQUID gradiometers using ramp-edge Josephson junctions (JJs) with multilayer structure of base-electrode of SmBa 2 Cu 3 O y (SmBCO) and counter-electrode of La 01 Er 0.95 Ba 1.95 Cu 3 O y (L1ErBCO) [9]. Because the ramp-edge JJs can be located at arbitrary positions, the novel HTS-SQUID gradiometers have no grain boundary (GB) in their differential pickup coils, while conventional HTS-SQUID gradiometers with bicrystal GB JJs usually have large GBs in their pickup coils, where flux vortices has high mobility, which is caused, for example, by the field change due to motion or rotation of the gradiometer in unshielded environment.…”

“…Thus, we constructed the practical robot-arm-based SQUID-NDE system utilizing the novel HTS-SQUID gradiometer that has high stability for operation and motion in unshielded environment. The schematic diagram and photograph of the system is shown in Figure 1 In this system, the HTS-SQUID gradiometer with ramp-edge JJs that have multilayer structures of base-electrode of SmBCO and counter-electrode of L1ErBCO was employed [9]. Because of its structure of 5μm-wide SQUID ring with the ramp-edge JJs and differential 3mm-by-3mm square pickup coils without long GB, the gradiometer can be cooled and operated without any magnetic shielding with the flux noise levels of about 10 μφ 0 /Hz 1/2 in the white noise region and about 120 μφ 0 /Hz 1/2 at 1 Hz in flux locked loop (FLL) operation with DC bias, where φ 0 is the flux quantum.…”