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Direct observation of vortices by the scanning SQUID microscopy was made onlarge mesoscopic disks of an amorphous MoGe thin film. Owing to the weakpinning nature of the amorphous film, vortices are able to form geometryinduced, (quasi-)symmetric configurations of polygons and concentric shells inthe large disks. Systematic measurements made on selected disks allow us totrace not only how the vortex pattern evolves with magnetic field, but also howthe vortex polygons change in size and rotate with respect to the disk center.The results are in good agreement with theoretical considerations formesoscopic disks with sufficiently large diameter. A series of vortex imagesobtained in a disk with a pinning site reveals a unique line symmetry in vortexconfigurations, resulting in modifications of the shell filling rule and themagic number.

Scanning SQUID Microscope Study of Vortex Polygons and Shells in Weak Pinning Disks of an Amorphous Superconducting Film