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Magneto-optical imaging (MOI) is a useful and highly versatile technique for the investigation of magnetic and current-carrying properties of superconductors. High-speed imaging is particularly important as superconductors often exhibit interesting magnetic behaviour over short timescales, such as the behaviour of individual flux vortices during magnetic flux penetration. The following method was developed to facilitate the high-speed acquisition of magneto-optical images of superconducting samples, and the determination of magnetic field and current flow data from these images. This method may be the first to allow current mapping of short timescale magnetic events in superconductors.

Magneto-optical images were acquired using a high-speed …