Magnetic fields can destroy superconductivity--the flow of electric current without resistance--so magnets don't usually get along very well with superconductors. But in the April Physical Review B, researchers show that by putting a thin magnetic layer on top of a superconducting film and applying a magnetic field, they can tweak the superconductor’s properties in a useful way. Their arrangement makes the superconductor anisotropic, meaning that more current can flow in one direction than in the perpendicular direction. And the specific orientation of these directions is controllable with another field. The technique has potential for superconducting devices.
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