Application of SQUID to magnetic contaminant detection

Spatial magnetic source detection based on active mode magnetoelectric gradiometer with 2D and 3D configurations

“…In this study, both the magnetic source and the ME gradiometer were stationary, therefore, the magnetic flux densities detected by the ME gradiometer were proportional to 1 |⃗ r| 3 . We define a constant k, and equation ( 4) can be simplified to k |⃗ r| 3 . In figure 6, the cuboid edge length is l, r 1 and is the center to center distance between the magnetic source and the ME sensors, α 1 and α 2 are the angles between the positive x axis and the projection of ME sensors 1 and 2, and β 1 and β 2 are the angles between the positive z axis and the vectors − → r 1 and − → r 2 .…”

“…Figure 7 illustrates the 3D magnetic gradient measurement setup at the measuring point of (3,3,3). It shows all nine different magnetic gradient components, given in the matrix equation (3).…”

“…Magnetoelectric (ME) composites have been investigated for many years, which possess remarkable performance for magnetic field detection [1][2][3]. Laminate ME composites consist of magnetostrictive and piezoelectric phase layers bonded together.…”

Fabrication of HTS ramp-edge-type Josephson junctions and SQUIDs using various YBCO-derivatives as barrier materials

“…11,12) Recent years, we have fabricated dc SQUID magnetometers and gradiometers containing ramp-edge-type JJs and succeeded in demonstrating actual application systems using liquid nitrogen as a coolant. [13][14][15][16][17][18][19] In order to stabilize the operation, larger magnetic modulation depth ΔV without sacrificing efficiency in coupling between a pickup coil and the inductor is desired. The fabrication technique of JJs exhibiting larger I c R n products reproducibly seems essential to obtain large ΔV.…”

Barrier structure of ramp-edge-type Josephson junction made of La-doped ErBCO and SmBCO electrodes

“…The investigations in refs.2 and 3 were carried out for the junctions prepared with the aim of application to digital circuits working at 20-40 K. Recent years, we have concentrated on development of SQUIDs with an operating temperature of 77 K [4]. Several SQUID systems were successfully fabricated and they have been utilized in various fields [5][6][7][8]. To the best of my knowledge, no data on the barrier of the junction working at 77 K is found in the literature so far published.…”