VORTEX IMAGING IN SUPERCONDUCTING FILMS BY SCANNING HALL PROBE MICROSCOPY

We have used a low noise Scanning Hall Probe Microscope (SHPM) to stud y vortex structures in superconducting films. The microscope has high magnetic field (similar to 2.9 x 10(-8)T/root Hz at 77 K) and spatial resolution, similar to 0.85 mu m. Magnetic field profiles of single vo rtices in High T-c YBa2Cu3O7-delta thin films have been successfully m easured and the microscopic penetration depth of the superconductor ha s been extracted as a function of temperature. Flux penetration into t he superconductor has been imaged in real time (similar to 8s/frame).