Nb-Ti Composite Wires with Artificial Ferromagnetic Pins
Flux-pinning data for Nb47Ti/Fe and Nb55Ti/Ni composites indicate that ferro-magnets pin by a barrier mechanism similar to the mechanism studied by Clem for superconductor/insulator multilayers. However, in contrast to Clem’s model, the optimum pin separation should be rather large, because at smaller pin separations the condition |ψ|2 = 0 at the superconductor/ferromagnet interface leads to a reduction of T c and H c2 . Nonetheless, we find no indication in the experimental data that pin separations much smaller than the predicted optimum value adversely affect J c, T c, or H c2.
KeywordsCritical Current Density Superconducting Order Parameter Scanning Electron Microscopy Data Filament Diameter Transport Critical Current Density
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- 8.John Clem, Iowa State University, private communication.Google Scholar