Nb-Ti Composite Wires with Artificial Ferromagnetic Pins

  • L. D. Cooley
  • P. D. Jablonski
  • R. W. Heussner
  • D. C. Larbalestier
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)


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.


Critical Current Density Superconducting Order Parameter Scanning Electron Microscopy Data Filament Diameter Transport Critical Current Density 
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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • L. D. Cooley
    • 1
  • P. D. Jablonski
    • 2
  • R. W. Heussner
    • 3
  • D. C. Larbalestier
    • 4
  1. 1.Electromagnetic Technology DivisionNISTBoulderUSA
  2. 2.Teledyne Wah ChangAlbanyUSA
  3. 3.Applied Superconductivity CenterUniversity of Wisconsin-MadisonMadisonUSA
  4. 4.Depts. of Physics and Materials ScienceUniversity of Wisconsin-MadisonMadisonUSA

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