Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

Abstract

Galvanomagnetic effect has been studied at 77 K on Bi-Sr-Ca-Cu-O films as a function of d.c. bias current. These films were prepared by spray pyrolysis and scrcenprinting techniques, with 7~ (R = 0) 80 K and 100 K respectively. Magnetic field dependence of Ic of sprayed-film showed very small hysteresis whereas screen-printed film showed greater hysteresis. Application of small magnetic field on these films destroyed the zero-resistance state and a finite resistance was developed. The slope of the resistance vs magnetic field curve AR/AH depended on the current flowing through the sample. To increase AR/AH, meander-shape pattern was prepared on the sprayed film. In general AR/AH increased by a factor of 103 after sample patterning. The possibility of using these films as a sensitive magnetic field sensor is discussed.

Thick-film sensors: past, present and future

“…The first method is to fabricate a superconducting quantum interference device (SQUID) [94]. The second technique is to make use of the magnetoresistance effect [95,96]. Both transducers are based on the Josephson effect, which is discussed in the next section.…”