Strong influence of a magnetic layer on the critical current of Nb bridge in finite magnetic fields due to surface barrier effect

Details Strong influence of a magnetic layer on the critical current of Nb bridge in finite magnetic fields due to surface barrier effect Strong influence of a magnetic layer on the critical current of Nb bridge in finite magnetic fields due to surface barrier effect

2008-12-25

arxiv.org/abs/0812.4608v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1063/1.3030983

We measured the critical current of the bilayer Nb/Co in the applied magnetic field. When the magnetic field was tilted to the axis which was perpendicular to the plane of the bilayer we observed a large difference in critical currents flowing in opposite directions. We found that the largest critical current of the bilayer exceeded the critical current of the superconductor without Co layer in a wide range of the tilted magnetic fields. The theory which takes into account the surface barrier effect for vortex entry and magnetic field of the magnetic layer gave a quantitative explanation of our experimental results.

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