Magnetic Christmas Tree

A snapshot of magnetic flux at super cold temperatures.
Image courtesy of W.A. Ortiz et al., DF/UFSCar, Brazil

Using a magneto-optical imaging technique, scientists have captured sudden avalanches of magnetic flux on a superconducting film. In superconductors, their electrical resistance drops to zero after reaching a unique critical temperature. The images for this superconducting film were captured at 268 degrees Celsius below zero.

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Threshold current critical density to trigger  flux avalanches in superconducting thin films