Vortex Imaging in Microscopic Superconductors With a Scanning SQUID Microscope

Abstract

Direct observation of vortex arrangement in microscopic superconductors is achieved with a scanning SQUID microscope. Newly 2 /spl mu/m diameter sensing pickup coil is developed for the observation of giant vortex state. Vortex arrangements in 10 /spl mu/m triangles is investigated with the new pickup device. No giant vortex state, however, can be seen under this experimental condition. Further investigation is needed.