NANOSTRUCTURED SUPERCONDUCTOR/ FERROMAGNET BILAYERS

摘要

We have studied the pinning properties of a type-Ⅱ superconducting film on top of two different types of magnetic artificial pinning centres. Such kind of pinning centres provides a strong pinning potential for the flux lines, yielding pronounced asymmetric M(H) magnetisation curves for perpendicularly magnetised samples. This opens the opportunity to tune the properties of a superconductor by switching between the magnetic states of the ferromagnetic nanostructures.