Magneto-optical studies of high-T/sub c/ SQUID circuits

High-transition-temperature superconducting quantum interference devices

“…wig, , but it does not account for the degraded quality of YBCO films at the edges of crossovers and vias. To study the spatial distribution of critical-current densities and thus locate potential noise sources, several groups have successfully used such techniques as low-temperature scanning electron microscopy (Husemann et al, 1993;Hollin et al, 1994;Gerber et al, 1996), low-temperature laser scanning microscopy (Sivakov et al, 1994), magneto-optical imaging (Govorkov et al, 1997) and scanning micro-Raman spectroscopy (Dieckmann et al, 1996).…”

High resolution magneto-optical study of superconducting thin films and devices

“…So it's worth trying to improve the field and spatial resolutions of this imaging system. High resolution MO imaging has already been employed to study High Tc flux transformer coils [6]. In this paper, we give the features that determine the signal to noise ratio of such MO imaging system and we deduce the field resolution versus the CCD pixel size.…”